AMS AS7620 Datasheet
广告
广告
A S 7 6 2 0
6 5 0 m A , U l t r a l o w R i p p l e S t e p D o w n D C / D C C o n v e r t e r
1 General Description
The AS7620 is an easy-to-use, high-efficiency, high-voltage, hysteretic step-down DC-DC converter, operating in asynchronous mode. Its low-power architecture extends hold-up time in batterybacked and critical applications where maximum up-time over a wide input supply voltage range is needed, while still providing for high efficiencies of up to 90% during peak current demands.
Although the AS7620 is optimized for 24V applications found in industrial and medical systems, its ability to support 100% Duty
Cycle makes the AS7620 ideal for applications demanding maximum up-time and soft power fail behavior. In combination with low idle current of only 30µA, on-demand switching reduces operating current at low load currents.
By selecting an appropriate inductor value, operating current can be lowered and switching frequencies tuned to certain load conditions.
A pin-strapped current limit input minimizes inductor peak current and thus inductor size and cost for any given application.
The device further includes output short-circuit protection and thermal shutdown. In shutdown mode, only 1µA (typ) of current is consumed.
2 Key Features
Low quiescent current for efficient partial load operation
Wide Supply Voltage Range, 3.6V to 32V
100% Duty Cycle extends operating range
Pin-programmable cycle-by-cycle current limit
Integrated PMOS eliminates bootstrap capacitor
Resistor-programmable Early Power Fail Warning Input
Power-Good Flag
Thermal Shutdown
Fixed 3.3V and adjustable output (1.2V to V
IN
)
Small 4x4mm 12-Lead MLPQ Enhanced Power Package
Specified from -40ºC to +125ºC junction and 85ºC maximum ambient temperatures
3 Applications
The AS7620 is suitable for Industrial 24VDC applications like PLCs, robotics; Home Security and Building Control applications; Solidstate utility meters; Signage and LED column power; and Sensor interfaces.
Figure 1. AS7620 - Block Diagram
VIN
SHDN
FB
VEPF
LDO
Temp Level
Shifter
Hysteretic
Controller
+
-
V
REF
+
-
+
-
Soft-Start
AS7620
I
SENSE
LX
ILIM
PG
PF www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
1 - 16
AS7620
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
V
IN
1
GND
2
LX
3
12 11 10
AS7620
PGND
4 5
6
9
GND
8
GND
7
SHDN
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1
2
3
6
7
4
5
10
11
8
9
12
Pad
Pin Name
V
IN
GND
LX
GND
FB
ILIM
SHDN
GND
GND
PF
VEPF
PG
PGND
Description
High Voltage Power Supply Input
Must be connected to GND
Power Output to Inductor
Must be connected to GND
Feedback input
Current Limit input
Shutdown input, active low
Must be connected to GND
Must be connected to GND
Early Power Fail output, open drain, active LOW
Comparator voltage input for early power fail warning
Power Good, open drain, active HIGH output, monitors feedback voltage
Exposed pad. Connect to GND plane to help thermal dissipation www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
2 - 16
AS7620
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
the device at these or any other conditions beyond those indicated in
Electrical Characteristics on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
V
IN
LX
Min
-0.3
-0.3
Max Units
V
V
Comments
FB, SHDN
All other pins except LX, FB and SHDN
Input Current (latch-up immunity)
Electrostatic Discharge
Electrostatic Discharge HBM
Temperature Ranges and Storage Conditions
-0.3
-0.3
-30
+/- 1
40
V
IN
+0.3
V
IN
+0.3 or 5.5
3.6
+30
V
V mA kV
Whichever is lower
Norm: JEDEC 78
1
Norm: MIL 883 E method 3015
Package Power Dissipation 1 W
θ
JA = 32ºC/W for a 4-layer board, 4 vias, T
AMB
=
+70ºC
Storage Temperature
Junction Temperature
-55 150
150
ºC
ºC
Package body temperature 260 ºC
The reflow peak soldering temperature (body temperature) specified is in accordance with
IPC/
JEDEC J-STD-020“Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Humidity non-condensing
Moisture Sensitive Level
5
3
85 %
Represents a max. floor life time of 168h
1. Voltage on pin 7 (SHDN) limited to +5.5V
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
3 - 16
AS7620
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
V
OUT
=3.3V, L
X
=10µH, C
X
=100µF, typical values at V
IN
= +24V and T
AMB
= +25ºC (unless otherwise specified). All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods.
Table 3. Electrical Characteristics
Conditions Symbol
T
AMB
T
J
V
IN
V
CC
V
ST
V
OUT
V
FB
V
HYS
V
EPF
V
PG
I
FB
I
OUT
Parameter
Operating Temperature Range
Operating Junction Temperature
Input Voltage Range
Start-up Voltage
AS7620-A
Output Voltage
AS7620-B
AS7620-A
Feedback voltage
Controller Hysteresis
AS7620-B
AS7620-A
AS7620-B
Early Power Fail Threshold
Power Good Threshold
Line Regulation
Load Regulation
Input Bias Current
Output Current
AS7620-A
AS7620-B
VEPF, ILIM
Initial, at 25ºC amb.
Over line, load and temperature
Initial, at 25ºC amb.
Over line and temperature
At FB node at V
EPF of V
FB at FB pin
V
IN
=8V to 24V, R
L
=200
Ω
10% to 90% load change
FB pin
Min
-40
-40
3.6
Typ
24
Max
85
125
32
-0.3
3.3
3.6
1.19
V
IN
3.267
3.300
3.333
3.218
3.383
1.178
1.190
1.202
1.166
1.214
3.218
3.300
3.383
8
22
15
42
30
82
91
1.19
93
0.1
0.9
95
3
200
5
I
LIM
/2
V
%
% / V
% nA
µA mA
V
V
V
Units
ºC
ºC
V
V
V
V mV
I
LIM t
ON
Switch Current Limit
P-Channel on resistance
Maximum Duty Cycle
Minimum On-Time
ILIM=0V
1
ILIM=V
OUT
2
ILIM=open
At V
IN
=3.6V
Current limit is not attained to turn off the switch before the minimum on-time expired
192
576
800
8
240
720
1000
0.4
10
288
864
1200
0.8
100
12 mA
Ω
%
µs t
OFF
I
Q
I
SHDN
V
LO
I
IBN
T
SHDN
Minimum Off-Time
Quiescent Current
Shutdown Current
Shutdown Threshold
Logic Input Bias Current
Shutdown Temperature
T
SHDN
Hysteresis
Non-switching
I
OUT
=500µA
T
AMB
= +25ºC
SHDN
SHDN
0.22
0.42
30
37
1
160
10
0.62
45
5
1
1
V
µA
ºC
ºC
µs
µA
µA
µA
1. LX=100µH, C
X
=10µF, Initial accuracy only. For temperature variation, please refer to performance graphs.
2. V
OUT
from 1.5V to 3.6V
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
4 - 16
AS7620
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
Figure 3. Efficiency vs. Output Current, V
OUT
=4.5V
100
VIN=5V
90
VIN=12V
80
VIN=24V
VIN=32V
70
60
50
40
30
1 10
Iout (mA)
100 1000
Figure 4. PMOS Rdson vs. Temperature
1000
900
800
700
600
500
400
300
200
100
0
-40 -20 0 20 40 60 80 100 120
Temp (C)
Figure 5. GND Current vs. I
OUT
@ T
AMB
10000
VIN=24V
1000
VIN=12V
100
VIN=32V VIN=5V
10
1
1.0
10.0
Iout (mA)
100.0
1000.0
Figure 6. GND Current vs. Temperature @ I
OUT
=0A
42.0
40.0
VIN=24V
38.0
36.0
34.0
32.0
VIN=32V
VIN=12V
30.0
28.0
-4
0
-2
0 0
VIN=5V
20 40 60
Temp (C)
80
10
0
12
0 www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
5 - 16
AS7620
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 7. Current Limit Threshold vs. V
IN
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
ILIM V OUT
ILIM FLOATING
ILIM GND
5 10 15 20
Vin (V)
25 30
Figure 9. Average Switching Frequency vs. I
OUT
(ILIM=open)
330000
300000
270000
240000
210000
180000
150000
120000
90000
60000
30000
0
0
VIN=32V
100 200
VIN=5V
300
Iout (mA)
VIN=24V
VIN=12V
400 500
Figure 11. Line Regulation @ I
OUT
=10mA
0.800%
0.600%
0.400%
0.200%
0.000%
-0.200%
-0.400%
-0.600%
-0.800%
-10%
10%
Vin Variation (%)
Figure 8. Average Switching Frequency vs. V
IN
1000000
I OUT =500mA
100000
I OUT =50mA
10000
I OUT =5mA
1000
I OUT =500µA
100
5 7 9 11 13 15 1719 21 23 25 27 29 31
Vin (V)
Figure 10. Shutdown Current vs. Temperature
1.8
1.7
1.6
1.5
VIN=32V
1.4
VIN=24V
1.3
1.2
VIN=12V
1.1
1
VIN=5V
0.9
0.8
-40 -20 0 20 40 60 80 100 120
Temp (C)
Figure 12. Line Regulation @ I
OUT
=500mA
0.400%
0.300%
0.200%
0.100%
0.000%
-0.100%
-0.200%
-0.300%
-0.400%
-10%
10%
Vin Variation (%)
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
6 - 16
AS7620
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 13. Load Regulation
1.000%
0.800%
0.600%
0.400%
0.200%
0.000%
-0.200%
0.1
-0.400%
-0.600%
-0.800%
-1.000%
1 10
Iout (mA)
100 1000
Figure 14. Line Regulation V
OUT
=5V @ 10mA
V OUT
V IN
Figure 15. Line Regulation V
OUT
=5V @ 10mA Figure 16. Load Regulation V
OUT
=5V 10mA
→
500mA
V OUT
V IN
Note:
All measurements taken at V
IN
=24V, V
OUT
=3.3V, and T
AMB
=25ºC using the typical application circuit specified in Figure 17
, unless otherwise specified.
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
7 - 16
AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
Figure 17. System Diagram of AS7620-A with Early Power Fail Warning
SHDN
PF
PG
3.6V to 32V
V
IN
C
IN
2.2µF
R
3
R
4
V
EPF
R
5
R
6
R
7
V
HYS
3.3V
V
IN
AS7620-A
L
X
10µH
FB
I
LIM
J
1
J
2
D
1
C
OUT
100µF
R
1
R
3
V
OUT
C
1
Table 4. AS7620 Output Voltage Options
AS7620
V
OUT
AS7620A-BQFT
ADJ.
AS7620B-BQFT
3.3V
8.1 Shut Down
The device can be shut down by providing a voltage lower than 1V at the SHDN pin (7). In this condition, the consumption is only 1µA (typ). The
AS7620 is providing an internally regulated pull-up circuit. No external pull-up resistor shall be used, which could otherwise damage the shutdown input. Connect the SHDN input directly to an open drain port only.
8.2 Soft Start
The device implements a soft start by limiting the inrush current into the output choke. Initially, the internal PMOS is turned on until the current reaches the programmed current limit
current approaches 0A. In this time frame, the FB voltage (V
FB
) will be lower than the reference and so the duty cycle will be driven by the current limit only.
8.3 Regulation
Both AS7620-A and AS7620-B are based on a hysteretic control method. Moreover, the switch current is monitored to make the converter always work in discontinuous current mode (DCM). The advantages of this type of control system can be summarized as following:
High efficiency even at light load
Intrinsically stable
Simplicity
Readiness during the load transient
The internal PMOS is switched on when the V
FB
is lower than V
REF
-V
HYST
/2 and the current is 0A (DCM). The on time will be terminated if the
V
FB
is over V
REF
+V
HYST
/2 or if the current limit (CL) is triggered. In practice, considering the most common application conditions (L=10µH ÷
100µH; C=10µF - 100µF) and setting the CL threshold according to the load, the on time is normally terminated by the CL intervention and the output voltage ripple will stay within 1.25% of the output voltage (typ) or V
HYST
* V
OUT
/ V
REF
.
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
8 - 16
AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
8.4 V
OUT
Selection
The AS7620-B features a 3.3V fixed output voltage. The AS7620-A provides an adjustable output from 1.2V (V
REF
) up to virtually V
IN
100% Duty Cycle Operation on page 11) . To select the desired V
OUT
, the related resistor divider has to be tuned according to the following formula:
V
OUT
=
V
REF
•
1 +
-------
Rl
Where:
Rh is the high side resistor of the output divider
Rl is the resistor of the output divider
Note:
It is suggested to select resistors in the range of hundreds of k
Ω
in order to limit the current consumption.
(EQ 1)
8.5 Current Limit
The current is sensed during the on time of the internal PMOS. Three different current limit thresholds can be selected by the ILIM pin:
1. 240mA (typ) ILIM shorted to GND
2. 720mA (typ) ILIM shorted to V
OUT
(from 1.5V to 3.6V)
3. 1000mA (typ) ILIM floating
This threshold is intended as peak current limit. If the current reaches the threshold during the on time, the PMOS is turned off and it will be turned on again only when the current approaches 0A and the feedback voltage is equal or lower than V
REF
. The maximum output current is
ILIM/2.
8.6 Switching Frequency
The switching frequency (f sw
) changes according to the application conditions and, in particular, to the output current in order to optimize the efficiency in any load condition. Anyway, it is always possible to estimate the f sw
inductor current must be equal to the output current. The following formula provides the relationship between inductor current and output current:
I
OUT
=
Tsw
•
2
•
--------------------------------------------------
V
ILIM
IN
–
V
2 •
L
OUT
)
•
•
V
V
IN
OUT
Consequently, the f sw
can be expressed as following:
Fsw
=
2
•
I
OUT
• (
V
ILIM
2 •
–
L
V
•
OUT
V
)
IN
•
V
----------------------------------------------------------------------------
(EQ 2)
(EQ 3)
Figure 18. Chart Illustrating the Fsw vs. I
OUT
in a Standard Application (V
IN
=24V, V
OUT
=3.3V, L=10µH, ILIM=1A)
Fsw vs. Iout
300
250
200
150
100
50
0
0 0.05
0.1
0.15
0.2
0.25
Iout (A)
0.3
0.35
0.4
0.45
0.5
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
9 - 16
AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
8.7 Power Fail / Power Good
AS7620A-B monitors input and output voltage by VEPF (pin 11) and V
FB
(pin 5) respectively. Two dedicated flags PF (pin 10) and PG (pin 12)
illustrates the typical connection for
VEPF. During start up, PF is initially low. By selecting R3, R4, R5 and R6, it is possible to set the desired input voltage threshold above which the input power is considered stable. Once V
IN
) reaches Vinth, PF is released and so an additional voltage contribution from
V
DD
is added at the VPF pin, realizing in fact a hysteresis to eliminate PF oscillation due to power supply noise.
Figure 19. Open-Drain Output Stage for Comparator
VDD
1.2…3.6
R3
VDDH
3.6…32V
V
REF
-
+
R4
INV
R6
R
ON
Power Fail
R5
the correct resistors values to guarantee the respect of maximum absolute voltages at EPF and PF pin. VDD has been considered 3.3V.
Otherwise EPF pin should be shorted to GND and PF left floating.
Terminology:
VRST: Reset voltage for the EPF. It is 90% of the Input BUS voltage.
VTRIP: Trip voltage for the EPF. It is 80% of the Input BUS voltage.
Table 5. EPF Network Selection with Different Input BUS
V
IN
(V)
5
6
9
12
15
20
24
28
VRST (V)
4.5
5.4
8.1
10.8
13.5
18
21.6
25.3
VTRIP (V)
4
4.8
7.2
9.6
12
16
19.2
22.5
R3 (K
Ω
)
365
464
768
1070
1370
1870
2260
2670
R4 (K
Ω
)
143
143
140
140
140
140
140
140
R5 (K
Ω
)
1740
1870
2050
2100
2150
2210
2260
2260
R6 (K
Ω
)
1370
1430
1580
1650
1690
1740
1740
1740
8.8 Thermal Protection
The internal junction temperature is continuously monitored. If it reaches 150ºC (min), the PMOS is turned off. The device can switch again if the temperature is decreased by at least 10ºC. If the over-temperature persists, the device will be shut down again resulting in a hiccup mode for the output power.
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
10 - 16
AS7620
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
9.1 Input Capacitors
An input capacitor is required to sustain the peak current requested by the turning on of the internal PMOS. When used, the capacitor helps to reduce the noise and saves the input battery life. The input capacitor has to withstand the input RMS current, which can be calculated by the following formula:
Irms
=
I
OUT
•
V
• (
V
V
IN
IN
–
V
OUT
)
--------------------------------------------------
(EQ 4)
While designing for wide input/output voltage range, the worst case of Irms=1/2*I
OUT
must be considered. Suggested capacitors are low ESR
OSCON, polymer, aluminum or MLCCs. Tantalum types are not recommended for their weakness in withstanding big inrush currents.
9.2 Output Inductor
The inductor together with the output capacitor represents the output filter. Using the AS7620, the inductor is charged and completely discharged at every switching cycle being that the converter is forced to work in DCM. Values from 10µH to 100µH are suitable to work with AS7620 and its selection should consider the following statements:
Bigger inductor implies lower f sw
Bigger inductor implies lower bandwidth
The inductor must be rated to withstand the peak current (ILIM) and the RMS current
Irms
=
I
OUT
2
+
∆
IL
3
2
9.3 Output Capacitor
The output capacitor together with the inductor represents the output filter. The bigger the capacitance is, the lower will be the output ripple.
Usually, low ESR MLCCs are preferred as they are inexpensive and small in size. Any value from 10µF is suitable, considering the load transient specifications of the application as well.
9.4 Free Wheeling Diode
The inductor current is forced through the diode during the off-times. The average current flowing through it is
1
fsw
2
• •
2
•
L
V
OUT
The reverse voltage must be higher than the input voltage and safely it is common to consider 30% more. Normally, a schottky diode is preferred because of its low forward voltage.
9.5 Stability
Even though the hysteretic voltage mode is intrinsically stable, an excessive noise at the FB could cause instability. For this reason care must be taken drawing the layout, reducing the noise and shielding the FB path from it. The main noise generator is the switching node, which is commutated from GND to V
IN
by the internal PMOS and the free wheeling diode and through which a pulse current flows. It is wise to add a
MLCC capacitor as close as possible to the V
IN
pin of the device and provide a wide/short path between the LX pin and the external components
(inductor and diode). It is preferable to draw the FB path as far as possible from the LX node and, perhaps, shielding it with a GND track. Another recommendation is to use low ESL output capacitors, thus avoiding electrolytic parts. A big ESL adds a square wave contribution on the FB that can make the device work improperly.
9.6 100% Duty Cycle Operation
Thanks to the PMOS structure of the internal switch, the device can actually work at 100% duty cycle. This feature is very helpful during the load transient, because the maximum power can be transferred to the output in order to recover as fastest. The device will try to work at 100% duty whenever the FB voltage is lower than the upper window’s threshold. Moreover, in this condition, the safety is always guaranteed by the current limit.
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
11 - 16
AS7620
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.7 Demo Board
A demonstration board is available to test the device functionalities and performance in a standard application. For further information, please refer to the AS7620EB datasheet.
Figure 20. Demo Board Photograph
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
12 - 16
AS7620
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Figure 21. 12-pin MLPQ 4x4mm Marking
AS7620A
YYWWXZZ
@
AS7620B
YYWWXZZ
@
Table 6. Packaging Code
YY WW
last two digits of the current year manufacturing week
X ZZ
plant identifier free choice / traceability code
@
sublot identifier www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
13 - 16
AS7620
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
Figure 22. 12-pin MLPQ 4x4mm Package
www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
14 - 16
AS7620
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 7 .
Table 7. Ordering Information
Ordering Code
AS7620-BQFT
Marking Output
AS7620A adjustable
AS7620B-BQFT* AS7620B 3.3V
Description
500mA Hysteretic High Voltage Step-Down
Converter with Dual Power Monitor
500mA Hysteretic High Voltage Step-Down
Converter with Dual Power Monitor without Output Delay
*
Available on request
Delivery Form Package
Tape and Reel 12-pin MLPQ 4x4mm
Tape and Reel 12-pin MLPQ 4x4mm
Note:
All products are RoHS compliant.
Buy our products or get free samples online at ICdirect: http://www.ams.com/ICdirect
Technical Support is found at http://www.ams.com/Technical-Support
For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.ams.com/distributor www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
15 - 16
AS7620
Datasheet
Copyrights
Copyright © 1997-2011, ams AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location.
The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services.
Contact Information
Headquarters ams AG
Tobelbaderstrasse 30
A-8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
For Sales Offices, Distributors and Representatives, please visit: http://www.ams.com/contact www.ams.com/DC-DC_Step-Up/AS7620 Revision 1.18
16 - 16
文档公共链接
广告
