APE1911X - Advanced Power Electronics Corp
Advanced Power
Electronics Corp.
APE1911
STEP-UP PWM DC/DC Converter
FEATURES
DESCRIPTION
Input Voltage:3V to 20V
The APE1911 is high efficient step-up DC/DC
converter. Large output current is possible having a built in
internal N channel MOSFET, and using an external coil and
diode.
The APE1911 can be operated at switching
frequencies of 500 kHz allowing for easy filtering and low
noise, the size of the external components can be reduced.
Output voltage is programmable with 1.0V of standard
voltage supply internal, and using externally connected
components, output voltage (FB) can be set up at will. The
soft-start time can be programmed by outside capacitor; the
function prevents overshoot at startup. Build inside Current
limit, Thermal Shutdown and enable functions.
Output Voltage:3.3V to 32V
Duty Ratio:0% to 85% PWM Control
Oscillation Frequency:500KHz.
Enable and Thermal Shutdown Function.
Internal Current Limit.
Built-in N-channel MOSFET
ESOP-8 & Pb-Free Package.
TYPICAL APPLICATION
VCC=5V
L1
22uH
Vout=12V
D1
B340A
U1
1
R1
100K
2
3
4
C1
C7
470uF
0.1uF
C3
Option
C2
EN
SGND
Vcc
PGND
FB
SW
.
SS
APE1911
SW
8
7
6
C4
C5
5
470uF
4.7uF
R4
11K
C8
0.47uF
0.47uF
R3
1K
VOUT = VFB x (1+R4/R3) , VFB = 1.0V, R3 = 1K ~3KΩ
PACKAGE & ORDERING INFORMATION
APE1911X
Package Type
MP : ESOP-8
( Top View )
EN
1
VCC
2
FB
3
SS
4
Exposed
pad
8
SGND
7
PGND
6
SW
5
SW
ESOP-8
(EP is connect to SW)
Data and specifications subject to change without notice
1
201010182
Advanced Power
Electronics Corp.
APE1911
ABSOLUTE MAXIMUM RATINGS
VCC Pin Voltage (VCC) ------------------------------------ GND - 0.3V to GND + 22V
Feedback Pin Voltage (VFB) ------------------------------ GND - 0.3V to 6V
ON/OFF Pin Voltage (VEN) ------------------------------- GND - 0.3V to VCC
Switch Pin Voltage (VSW ) --------------------------------- GND - 0.3V to 34V
SS Pin Voltage (VSS) --------------------------------------- GND - 0.3V to 6V
Power Dissipation (PD) ------------------------------------ Internally limited
Storage Temperature Range (TST) --------------------- -40°C to +150°C
Operating Junction Temperature (TOPJ) --------------- -20°C to +125°C
Thermal Resistance from Junction to Case(RthJC)
15°C/W
Thermal Resistance from Junction to Ambient(RthJA)
40°C/W
2
Note. RthJA is measured with the PCB copper area (connect to exposed pad) of approximately 1 in (Multi-layer).
ELECTRICAL SPECIFICATIONS
(VIN=5V, VOUT=12V, TA=25°C, unless otherwise specified)
Parameter
SYM
Operating Supply Voltage
VCC
TEST CONDITION
MIN
TYP
MAX
UNITS
3
-
20
V
Output Voltage Range
VOUT
3.3
-
32
V
Feedback Voltage
VFB
IOUT=0.1A
0.98
1
1.02
V
Feedback Bias Current
IFB
IOUT=0.1A
-
0.1
0.5
uA
.
Quiescent Current
ICCQ
VFB=1.5V force driver off
-
4
6
mA
Shutdown Supply Current
ISD
VEN =0V
-
1
10
uA
SW pin
400
500
600
KHz
Line Regulation
VCC =3~0.8*Vout
-
1
-
%
Load Regulation
IOUT=50m~1A
-
1
-
%
VSH
High (regulator ON)
2
-
-
VSL
Low (regulator OFF)
-
-
0.8
ISH
VEN=2.5V (ON)
-
20
-
ISL
VEN=0.3V (OFF)
Oscillation Frequency
EN Pin Logic input threshold
voltage
EN Pin Input Current
FOSC
V
uA
-
-1
-
uA
ISS
-
8
-
uA
Switching Current Limit
ILIM-sw
2.8
3
-
A
Internal MOSFET RDSON
RDSON
Efficiency
EFFI
SS pin Current
VCC=5V
-
40
80
VCC=12V
-
30
60
VCC=5V, VOUT=12V, IOUT=0.5A
-
92
-
Maximum Duty Cycle
DCMAX
VFB=0V
-
85
-
Minimum Duty Cycle
DCMIN
VFB=1.5V
-
0
-
-
145
-
Thermal Shutdown Temp
TSD
mΩ
%
%
°C
2
Advanced Power
Electronics Corp.
APE1911
PIN DESCRIPTIONS
PIN SYMBOL
VCC
PIN DESCRIPITON
IC Power Supply Pin
SW
Switch pin. Connect external inductor & diode here
FB
Feedback Pin
Shutdown Pin
EN
H : Normal operation
SS
Soft-Start Pin.
L : Shutdown
PGND
Power Ground pin
SGND
Signal Ground pin.
BLOCK DIAGRAM
Vcc
Phase
Compensation
FB
+
-
.
Vref=1.0V
PWM
Controller
VEN
8uA
SS
SW
+
-
EN
Regulator
Buffer
Driver
Oscillator
Thermal
Shutdown
0.06V
SGND
PGND
3
Advanced Power
Electronics Corp.
APE1911
FUNCTION DESCRIPTION
PWM Control
The APE1911 consists of DC/DC converters that employ a pulse-width
modulation (PWM) system. In converters of the APE1911, the pulse width varies in a
range from 0 to 85%, according to the load current. The ripple voltage produced by the
switching can easily be removed through a filter because the switching frequency
remains constant. Therefore, these converters provide a low-ripple power over broad
ranges of input voltage and load current.
Setting the Output Voltage
Application circuit item shows the basic application circuit with APE1911 adjustable
output version. The external resistor sets the output voltage according to the following
equation:
VOUT = 1.0V x (1+R4/R3)
Table 1 Resistor select for output voltage setting
VOUT
R3
R4
12V
1K
11K
15V
1.3K
18K
18V
1.3K
22K
24V
1.3K
30K
32V
2.2K
68K
.
Inductor Selection
For most designs, Low inductance values are physically smaller but require faster
switching, which results in some efficiency loss. The inductor value can be derived from
the following equation:
L = [VIN x (VOUT-VIN)] / VOUT x ∆ IL x fLx
Where is inductor Ripple Current. Large value inductors lower ripple current and small
value inductors result in high ripple currents. Choose inductor ripple current approximately
15% of the maximum input current 2.4A, ∆IL=0.18A.
VOUT
9V
12V
15V
18V
L1 Value
18uH
22uH
25uH
33uH
The DC current rating of the inductor should be at least equal to the maximum load
current plus half the ripple current to prevent core saturation (2.4A+0.18A).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching
noise from the device. The input capacitor impedance at the switching frequency shall be
less than input source impedance to prevent high frequency switching current passing to
the input. A low ESR input capacitor sized for maximum RMS current must be used.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
4
Advanced Power
Electronics Corp.
APE1911
FUNCTION DESCRIPTION
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to
ensure regulation loop stability. The output capacitor must have low impedance at the
switching frequency. A low ESR capacitor sized for maximum RMS current must be
used. The low ESR requirements needed for low output ripple voltage.
The capacitor voltage rating should be at least 1.5 times greater than the input
voltage, and often much higher voltage ratings are needed to satisfy.
Output Capacitor Selection
When laying out the PC board, the following suggestions should be taken to ensure
proper operation of the APE1911. These items are also illustrated graphically in below.
1. The power traces, including the Source trace, the Schottky and the C1 trace should
be kept short, direct and wide to allow large current flow.
2. The power ground is keep C4’s ground closed and far away signal ground.
3. The signal ground trance is distant from power ground trance.
4. The exposed pad is connecting to SW trace closely and widely. (Reduce IC
temperature)
5. Do not trace signal line under inductor.
.
(APE1911 PCB Layout -Top View)
5
Advanced Power
Electronics Corp.
APE1911
TYPICAL PERFORMANCE CHARACTERISTICS
IOUT VS VOUT
Vout (V)
Vout (V)
VCC VS VOUT
13
12.8
12.6
12.4
12.2
12
11.8
11.6
11.4
11.2
11
IOUT=0.1A
3
4
5
6
7
8
9
13
12.8
12.6
12.4
12.2
12
11.8
11.6
11.4
11.2
11
VCC=5V
0
10
100
300
400
500
600
Temperature VS Curret Limit
6.0
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
5.0
.
Current Limit (A)
Current Limit (A)
VCC VS Current Limit
4.0
3.0
2.0
1.0
VOUT=24V
VCC=5V, Vout=12V
0.0
3
6
9
12
15
18
-50
-25
VCC (V)
Temperature VS Frequency
0
25
50
Temperature (℃)
75
100
75
100
Temperature VS VFB
750
1.05
700
1.04
1.03
650
600
VFB (V)
Frequency (KHz)
200
IOUT (mA)
VCC (V)
550
500
450
1.02
1.01
1.00
0.99
0.98
400
350
0.97
0.96
VCC=5V, Vout=12V
IOUT=100mA
300
0.95
250
-50
-25
0
25
50
Temperature (℃)
75
100
-50
-25
0
25
50
Temperature (℃)
6
Advanced Power
Electronics Corp.
APE1911
TYPICAL PERFORMANCE CHARACTERISTICS
Power-ON Wave
(VCC=5V, Vout=12V, Load=0.8A, SS=0.47uF)
Enable-ON Wave
(VCC=5V, Vout=12V, Load=0.8A, SS=0.47uF)
VEN
VCC
SS
SS
VOUT
VOUT
ISW
ISW
.
7
Advanced Power
Electronics Corp.
APE1911
MARKING INFORMATION
ESOP-8
Part Number
Package Code
1911MP
YWWSSS
Date Code (YWWSSS)
Y:Last Digit Of The Year
WW:Week
SSS:Sequence
.
8
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