MAX5051 EV kit
19-2986; Rev 0; 9/03
MAX5051 Evaluation Kit
Features
♦ 50W, High-Efficiency, Isolated Forward Converter
♦ Synchronous Rectified
♦ ±36V to ±72V Input Range
♦ +3.3V Output at 15A
♦ VOUT Regulation Better than 0.5% Over Line and
Load
♦ 91% Efficiency at 3.3V/10A Output
♦ Cycle-by-Cycle Current-Limit Protection
♦ Programmable Integrating Fault Protection
♦ 1/8th Brick Module Pinout
♦ 250kHz Switching Frequency
♦ Soft-Start
♦ Remote Output Voltage Sense
♦ Output Voltage Trim Pin
♦ Fully Assembled and Tested
Ordering Information
PART
MAX5051EVKIT
TEMP RANGE
IC PACKAGE
0°C to +50°C*
28 TSSOP
*With 100LFM airflow.
Component List
DESIGNATION QTY
DESCRIPTION
C1
1
100pF ±2%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101GA01D
C2
1
390pF ±5%, 50V C0G ceramic
capacitor (0603)
Taiyo Yuden UMK107CH391JZ
C3
1
4.7µF ±10%, 10V X5R ceramic
capacitor (0805)
TDK C2012X5R1A475K
C4
1
4.7µF ±10%, 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J475K
C5
1
4700pF ±10%, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H472K
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Evaluates: MAX5051
General Description
The MAX5051 evaluation kit (EV kit) is a fully assembled
and tested circuit board that contains a high-efficiency,
50W, isolated, synchronously rectified forward converter in the industry-standard 1/8th brick pinout. The circuit is configured for a +3.3V output voltage and provides up to 15A of output current. The circuit can be
powered from either a +36V to +72V or -36V to -72V DC
source used in the telecom/datacom markets (48V
modules), industrial environments, or in automotive 42V
power systems.
Up to 91% high efficiency is achieved at 10A using a
clamped, two-transistor power topology on the primary
side and synchronous rectifiers on the secondary side.
Part of the efficiency improvement is due to the recovery of stored leakage and magnetizing inductance
energy at the primary side. On the secondary side, high
efficiency is achieved through synchronous rectification. Up to 500V galvanic isolation is achieved by optocouplers and a planar surface-mount transformer.
Operation at 250kHz allows the use of small magnetics
and output capacitors. The EV kit provides cycle-by
cycle current-limit protection. Integrating fault protection provides additional steady-state fault protection
that reduces average dissipated power during continuous short-circuit conditions. The MAX5051 also has a
programmable undervoltage lockout (UVLO).
Warning: The MAX5051 EV kit is designed to operate
with high voltages. Dangerous voltages are present on
this EV kit and on equipment connected to it. Users
who power up this EV kit or power the sources connected to it must be careful to follow safety procedures
appropriate to working with high-voltage electrical
equipment.
Under severe fault or failure conditions, this EV kit may
dissipate large amounts of power, which could result in
the mechanical ejection of a component or of component debris at high velocity. Operate this EV kit with
care to avoid possible personal injury.
Evaluates: MAX5051
MAX5051 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESIGNATION QTY
DESCRIPTION
C6
1
0.1µF ±10%, 250V X7R ceramic
capacitor (1206)
TDK C3216X7R2E104K
C22
1
2200pF ±10%, 2kV X7R ceramic
capacitor (1812)
TDK C4532X7R3D222K
C7, C36
2
0.22µF ±10%, 10V X7R ceramic
capacitors (0603)
TDK C1608X7R1C224K
C23
1
1000pF, 250V X7R ceramic capacitor
(0603)
Murata GRM188R72E102KW07
C8
1
4.7µF ±10%, 16V X7R ceramic
capacitor (1206)
TDK C3216X7R1C475K
C25
1
0.047µF ±10%, 100V X7R ceramic
capacitor (0805)
TDK C2012X7R2A473K
C9
1
1µF ±10%, 16V X7R ceramic
capacitor (0805)
Taiyo Yuden EMK212BJ105KG
C26, C29, C30,
C31
4
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
C10, C11
2
0.47µF ±10%, 100V X7R ceramic
capacitors (1206)
TDK C3216X7R2A474K
C27
1
0.15µF ±10%, 16V X7R ceramic
capacitor (0603)
Taiyo Yuden EMK107BJ154KA
1
1µF ±20%, 100V X7R ceramic
capacitor (1210)
TDK C3225X7R2A105M
or AVX12101C105KAT9A
C28
1
0.047µF ±10%, 25V X7R ceramic
capacitor (0603)
TDK C1608X7R1E473K
C32, C35
2
3
270µF, 4V aluminum organic
capacitors (X)
Kemet A700X277M004AT
1µF ±10%, 25V X7R ceramic
capacitors (0805)
TDK C2012X7R1E105K
C34
1
1
3.3µF ±10%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ335KG
330pF ±5%, 250V C0G ceramic
capacitor (0603)
TDK C1608C0G2E331J
D1
1
1
0.33µF ±10%, 10V X5R ceramic
capacitor (0603)
TDK C1608X5R1A334K
150mA, 100V Schottky diode (SOD123)
Diodes Incorporated BAT46W
D2, D3
2
2A, 100V Schottky diodes (SMB)
Diodes Incorporated B2100
2
1000pF ±5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H102J
D4, D7
2
3A, 20V Schottky diodes (SMA)
Diodes Incorporated B320A
D5, D6, D8
3
250mA, 100V fast-switching diodes
(SOD-323)
Diodes Incorporated 1N4448HWS
1
2.4µH, 20A inductor
Payton Planar Magnetics Ltd. 50661
or
Pulse Engineering PA1494-242 or
Coilcraft A9860-B*
C12
C13, C14, C15
C16
C17
C18, C24
C19, C33
2
1µF ±10%, 10V X5R ceramic
capacitors (0603)
TDK C1608X5R1A105K
C20
1
220pF ±10%, 50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H221K
C21
2
DESCRIPTION
1
4.7µF, 80V electrolytic capacitor (D)
Cornell Dubilier AFK475M80D16B
L1
_______________________________________________________________________________________
MAX5051 Evaluation Kit
DESIGNATION QTY
N1, N2
N3, N4
DESCRIPTION
2
100V, 7.3A N-channel MOSFETs
(8-pin SO) IR IRF7495 or
Vishay Siliconix Si4486EY
2
20V, 20A N-channel MOSFETs
(8-pin SO)
IR IRF7832 or
Vishay Siliconix Si4864DY
N5
1
170mA, 100V N-channel MOSFET
(SOT23)
Fairchild BSS123
R1
1
11.5kΩ ±1% resistor (0603)
R2
1
2.55kΩ ±1% resistor (0603)
R3
1
2.2kΩ ±5% resistor (0603)
R4
1
1MΩ ±1% resistor (0603)
R5
1
38.3kΩ ±1% resistor (0603)
R6
1
1MΩ ±1% resistor (0805)
R7, R20
2
0Ω ±5% resistors (0603)
R8, R9
2
8.2Ω ±5% resistors (0603)
R10
1
20Ω ±5% resistor (1206)
R11
1
360Ω ±5% resistor (0603)
R12
1
100kΩ ±1% resistor (0603)
R13
1
47Ω ±5% resistor (1206)
R14
1
270Ω ±5% resistor (0603)
R15
1
31.6kΩ ±1% resistor (0603)
R16
1
R17
1
R18
1
10.5kΩ ±1% resistor (0603)
0.027Ω ±1%, 0.5W resistor (1206)
IRC LR1206-01-R027-F
4.7Ω ±5% resistor (1206)
R19
1
475Ω ±1% resistor (0805)
R21
1
24.9kΩ ±1% resistor (0805)
R22
1
15kΩ ±5% resistor (1206)
Quick Start
Required Equipment
• ±36V to ±72V power supply capable of providing up
to 3A
• Voltmeter
• A fan to provide at least 100LFM airflow for extended operation at 15A
• 100µF, 100V bulk storage capacitor to be connected to the input terminals of the EV kit
The MAX5051 EV kit is fully assembled and tested.
DESIGNATION QTY
DESCRIPTION
R23, R24
2
10Ω ±5% resistors (0805)
R25
1
100kΩ ±5% resistor (0805)
R26
1
560Ω ±5% resistor (0805)
R27
1
10Ω ±5% resistor (0603)
R28
1
2kΩ ±5% resistor (0805)
R29
1
1Ω ±5% resistor (0603)
T1
1
Planar transformer
Pulse Engineering PA0370 or
Payton Planar Magnetics Ltd. 50659*
U1
1
MAX5051AUI (28-pin TSSOP)
U2
1
High-speed, high-voltage
photocoupler (ultra small flat lead)
CEL/NEC PS2913-1-F3-M
U3
1
0.6V ±0.5% shunt regulator (5-pin
SOT23)
Maxim MAX8515AEZK-T
U4, U7
2
7.6A MOSFET drivers (6-pin SOT23)
Maxim MAX5048AAUT-T
U5
1
65V high-voltage linear regulator
(8-pin SO)
Maxim MAX5023MASA
U6
1
10Mbps photocoupler (5-pin SOP)
CEL/NEC PS9715-F3
+VIN, -VIN,
ON/OFF,
SENSE(+),
SENSE(-), TRIM
6
0.040in PC pins
VOUT, SGND
2
0.062in PC pins
None
1
MAX5051 PC board
*Modifications to the PC board traces are required to evaluate
this component.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed.
Forward DC-DC Converter
No-Load Output
1) Connect a jumper wire from the VOUT terminal to
the SENSE(+) terminal.
2) Connect a jumper wire from the SGND terminal to
the SENSE(-) terminal.
3) Connect a voltmeter to the SENSE(+) and SENSE(-)
terminals to measure the output voltage.
_______________________________________________________________________________________
3
Evaluates: MAX5051
Component List (continued)
Evaluates: MAX5051
MAX5051 Evaluation Kit
4) Connect a 100µF, 100V bulk storage capacitor to
the top of the +VIN and -VIN pins.
5) Connect the positive terminal of a 36V to 72V power
supply to the +VIN terminal. Connect the power supply’s ground to the -VIN terminal.
6) Turn on the power supply above 36V and verify that
the voltmeter reads +3.3V.
Detailed Description
The MAX5051 EV kit is a 50W isolated forward converter that provides +3.3V at up to 15A output. The circuit
can be powered from a ±36V to ±72V DC source. The
user should supply an additional 100µF bulk storage capacitor between the input terminals (+VIN,
-VIN). This capacitor should be rated for 100V and be
able to carry 1.5A of ripple current. Lower ripple-current-rated capacitors should be fine for short-term
operation.
The 50W forward converter achieves high efficiency by
using a clamped two-transistor power topology at the
input power stage. The PC board footprint is minimized
by using two external surface-mount, 8-pin SO N-channel, 100V-rated MOSFETs. Cycle-by-cycle current limiting protects the converter against short circuits at the
output. For a continuous short circuit at the output, the
MAX5051’s fault integration feature provides hiccup
fault protection, thus greatly minimizing destructive
temperature rise. Current-sense resistor R17 senses
the current through the primary of transformer T1 and
turns off both external transistors N1 and N2 when the
trip level of 154mV (typ) is reached. The programmable
integrating fault protection allows transient overload
conditions to be ignored and is configured by resistor
R4 and capacitor C7.
The planar surface-mount transformer features a bias
winding that (along with diode D5, current-limiting resistor R18, and reservoir capacitor C21) power the
MAX5051 once the input voltage is stable. Upon initial
input voltage application, bootstrap resistor R22 and
capacitor C21 enable the MAX5051 to start up within
approximately 70ms. No reset windings are required on
the transformer with a clamped two-transistor power
topology simplifying transformer design and maximizing
the available copper window in the transformer. When
both external primary-side transistors turn off, Schottky
diodes D2 and D3 recover the magnetic energy stored
in the core and feed it back to the input supply. The
transformer provides galvanic isolation up to 500V.
On the transformer’s secondary side, a 0.6V shunt regulator (MAX8515, U3) along with feedback resistors R1
and R2 provide voltage feedback to the primary side
4
through optocoupler U2. Remote output voltage sensing is provided by the SENSE(+) and SENSE(-) pins for
accurate output voltage regulation across the load. The
MAX5051 receives the voltage feedback signal on the
primary side from biasing resistors R15, R16, and compensation resistor-capacitor network R11/C17 and C24
connected to optocoupler U2.
Optocoupler U6 receives the MAX5051 synchronous
rectifier drive signal from the primary side and provides
the MAX5048 secondary-side high-speed MOSFET drivers, U4 and U7, with a galvanically isolated signal.
MOSFET N4 forms a synchronous rectifier for freewheeling-diode D4 and MOSFET N3 forms the synchronous rectifier for rectifier-diode D7. Voltage regulation
for U4, U6, and U7 is provided by a MAX5023 linear
regulator on the secondary side.
The MAX5051 controller switches at 250kHz frequency
set by resistor R21 and capacitor C1. The duty cycle is
varied to control energy transfer to the output. The
maximum duty cycle is 50% for the EV kit's forward
converter design.
The MAX5051 features output-voltage soft-start, thus
eliminating any output-voltage overshoots. Soft-start
allows the output voltage to slowly ramp up in a controlled manner within approximately 3ms. Capacitor C5
sets the soft-start time.
The brownout UVLO threshold voltage is set by resistors R5 and R6. This prevents the power supply from
operating below the programmed input supply voltage.
The four-layer PC board layout and component placement have been designed to have an industry-standard
1/8th brick pinout. The actual PC board dimensions
(58.42mm x 41.65mm) of the power-supply board are
somewhat larger than that of 1/8th brick power supplies.
Evaluating Other Output Voltages, Current
Limits, Soft-Starts, and UVLOs
VOUT Output Voltage
The MAX5051 EV kit’s output (VOUT) is set to +3.3V by
feedback resistors (R1, R2). To generate output voltages other than +3.3V (from +2.6V to +4.0V, limited by
the output-capacitor voltage rating), select different
voltage-divider resistors (R1, R2). Resistor R1 is typically chosen to be less than 25kΩ. Using the desired output voltage, resistor R2 is then found by the following
equation:
R2 =
R1
((VOUT / VREF ) − 1)
where VREF = 0.6V
_______________________________________________________________________________________
MAX5051 Evaluation Kit
Current Limiting
The EV kit features cycle-by-cycle current limiting of the
transformer primary current. The MAX5051 turns off
both external switching transistors (N1, N2) when the
voltage at the CS pin of the MAX5051 reaches 154mV
(typ). Current-sense resistor R17 (= 0.027Ω) limits the
peak primary current to approximately 5.7A
(154mV/0.027Ω ≈ 5.7A). This limits short-circuit current
on the secondary output (VOUT) to 20.3A peak typically. Under short-circuit conditions, the average output
current is only 473mA typically due to hiccup-mode
fault protection. To evaluate lower current limits, current-sense resistor R17 must be replaced with a different value surface-mount resistor (1206 size) as determined by the following equation:
R17 =
VSENSE
((Ns / Np ) × (1.2 × IOUTMAX ))
where VSENSE = 0.154V, Ns = 2, Np = 8 and IOUTMAX =
maximum DC output current (15A or less). Note that
some fine tuning may be required when selecting the
current-limit resistor. There are errors introduced as a
result of the presence of the transformer and output
inductor ripple current.
Soft-Start
The MAX5051 EV kit limits the output voltage rate of
rise with a soft-start feature. Capacitor C5 sets the
ramp time to 91ms. To evaluate other soft-start ramp
times, replace capacitor C5 with another surface-mount
capacitor (0603 size) as determined by the following
equation:
C5 =
(65µA × softstart _ time)
1.24V
where softstart_time is the desired soft-start time in
seconds.
Undervoltage Lockout (UVLO)
The MAX5051 EV kit features a UVLO circuit that prevents operation below the programmed input supply
start voltage. Resistors R5 and R6 set the input voltage
brownout UVLO of the EV kit. To evaluate other input
UVLO voltages, replace resistor R6 with another surface-mount resistor (0805 size). Using the desired startup voltage, resistor R6 is then found by using the following equation:
 (VINSTARTUP − 1.24V ) 
R6 = 
 × R5
1.24V


where VINSTARTUP is the desired startup voltage at
which the EV kit starts and resistor R5 is typically 38.3kΩ.
Component Suppliers
PHONE
FAX
AVX
SUPPLIER
843-946-0238
843-626-3123
www.avxcorp.com
CEL/NEC; California Eastern Laboratories
800-997-5227
408-588-2213
www.cel.com
Coilcraft
847-639-6400
847-639-1469
www.coilcraft.com
Cornell Dubilier
508-996-8564
508-336-3830
www.cornell-dubilier.com
Diodes Inc
805-446-4800
805-446-4850
www.diodes.com
Fairchild
888-522-5372
Local representative only
International Rectifier
310-322-3331
310-726-8721
www.irf.com
IRC
361-992-7900
361-992-3377
www.irctt.com
Kemet
864-963-6300
864-963-6322
www.kemet.com
Murata
770-436-1300
770-436-3030
www.murata.com
Payton Planar Magnetics Ltd.
561-969-9585
561-989-9587
www.paytongroup.com
Pulse Engineering
858-674-8100
858-674-8262
www.pulseeng.com
Taiyo Yuden
800-348-2496
847-925-0899
www.t-yuden.com
TDK
847-803-6100
847-390-4405
www.component.tdk.com
—
—
Vishay
WEBSITE
www.fairchildsemi.com
www.vishay.com
_______________________________________________________________________________________
5
Evaluates: MAX5051
The maximum output current should be limited to less
than 15A. The usable output voltage range for the EV
kit is +2.6V to +4.0V. Additionally, U3, U2, and resistor
R19 limit the minimum output voltage (VOUT) to +2.6V.
Evaluates: MAX5051
MAX5051 Evaluation Kit
Synchronous Rectified Forward DC-to-DC Converter Waveforms
POWER DISSIPATION
vs. LOAD CURRENT
EFFICIENCY vs. OUTPUT CURRENT
7
95
36V
6
90
POWER DISSIPATION (W)
48V
EFFICIENCY (%)
85
80
72V
75
70
72V
5
4
48V
3
36V
2
1
65
0
60
0
2
4
6
8
10
12
0
14
2
4
6
8
10
Figure 1. Efficiency vs. Output Current
14
Figure 2. Power Dissipation vs. Load Current
VIN = 48V
VIN = 48V
VOUT
1V/div
0
IOUT
5A/div
VOUT
1V/div
0
IOUT
0
0
4ms/div
Figure 3. Turn-On Transient at Full Load (Resistive Load)
6
12
LOAD CURRENT (A)
LOAD CURRENT (A)
4ms/div
Figure 4. Turn-On Transient at Zero Load
_______________________________________________________________________________________
MAX5051 Evaluation Kit
Evaluates: MAX5051
VOUT
100mV/div
VOUT
50mV/div
IOUT
5A/div
2µs/div
1ms/div
LOAD CAPACITOR: NO EXTERNAL
CAPACITOR REQUIRED FOR TRANSIENT RESPONSE.
LOAD CAPACITANCE: 0.1µF CERAMIC CAPACITOR
SCOPE BANDWIDTH: 20MHz.
Figure 5. Output Voltage Response to Step Change in Load
Current (50%-75%-50% of IOUT (max), di/dt = 5A/ms, 7.5A to
11.25A to 7.5A)
Figure 6. Output Voltage Ripple at Nominal Input Voltage and
Rated Load Current
OUTPUT VOLTAGE
vs. LOAD CURRENT
5
OUTPUT VOLTAGE (V)
4
A
IOUT
10A/div
3
HICCUP POINT
2
B
IOUT
10A/div
1
0
0
5
10
15
20
LOAD CURRENT (A)
Figure 7. Output Voltage vs. Load Current Showing Typical
Limit Curves and Converter Shutdown Points (Note: Hiccup
Current Limiting Provides Current Foldback Mechanism that
Helps to Minimize Power-Supply Power Dissipation During
Fault Conditions)
A: 1ms/div
B: 20ms/div
Figure 8. Load Current (10A/div) as a Function of Time when
Converter Attempts to Turn On into a 0.050Ω Short Circuit
(Also Acts as Current-Sense Resistor)
_______________________________________________________________________________________
7
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
EFFICIENCY vs. INPUT VOLTAGE
95
4.0
94
3.5
93
3.0
EFFICIENCY (%)
OUTPUT VOLTAGE (V)
Evaluates: MAX5051
MAX5051 Evaluation Kit
2.5
2.0
1.5
92
91
90
89
88
1.0
87
0.5
86
85
0
20
25
30
35
40
Figure 9. Output Voltage vs. Input Voltage (Point Device
Comes Out of Programmed UVLO and Goes Into UVLO)
0
35
45
55
65
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 10. Efficiency vs. Input Voltage, IOUT = 15A
25V/div
2µs/div
Figure 11. Waveform Across Primary-Side Transformer (T1),
Input = 48V
8
_______________________________________________________________________________________
75
MAX5051 Evaluation Kit
TP1
C1
100pF
C2
390pF
C5
4700pF
C19
1µF
PVIN
REG9
REG5
R15
31.6kΩ
1%
TP3
4
3
1
2
3
4
RCOSC
SYNCOUT
RCFF
CON
PVIN
REG9
REG5
FB
U1
SYNCIN
28
26
FLTINT 27
STARTUP
25
24
BST 22
AVIN 23
GND
UVLO
2
1
IC_PADDLE
CS
DRVL
PGND
DRVDD
DRVB
XFRMRH
C28
0.047µF
R12
100kΩ
1%
R19
475Ω
R20
0Ω
29
15
16
17
18
19
20
MAX5051 DRVH 21
COMP
5 CSS
6
7
8
9
10
LXL
LXH
LXVDD
11 STT
12
13
14
U2
C36
0.22µF
R23
10Ω
+VIN
D1
R4
1MΩ
1%
C7
0.22µF
1
DRVB
2
+VIN
R2
2.55kΩ
1%
5
3
R14
270Ω
R9
8.2Ω
XFRMRH
C8
4.7µF
ON/OFF
REG9
C9
1µF
C20
220pF
C27 VOUT
0.15µF
TRIM
R1
11.5kΩ
1%
+VIN
R7
0Ω
8
REG9
2
1
4
2
D2
VOUT
R18
4.7Ω
D5
R13
47Ω
1
2
C34
330pF
N2
3
PVIN
GND
PGND
IN
C21
4.7µF
80V
2
7
R6
1MΩ
1%
R5
38.3kΩ
1%
1
2 65
4
U3
R17
0.027Ω
1%
D3
R8
8.2Ω
1
OUT
FB
2
3
2
4
N1
6
8 7
5
7
3
2
8
XFRMRH
8
2T
2
1
10
D7
+VIN
T1
1
XFRMRH
1
8T
5
1
4T
6
R22
15kΩ
R24
10Ω
2
D6
R10
20Ω D4
6
5
4
N3
C23
1000pF
1
1
C11
0.47µF
100V
1
2
3
C12
1µF
100V
+VIN
8
6
7
5
6
5
4
C13
270µF
4V
C25
0.047µF
100V
WDI
OUT
N.C.
U5
EN
HOLD
IN
GND
L1
2.4µH
GND
RESET
6
5
4
7
8
2 4
3
N4
1
C32
1µF
C35
1µF
C10
0.47µF
100V
1
2
U4
IN-
N_OUT
IN+
5V
P_OUT
6
4
5
V+
IN+
IN-
U7
P_OUT
GND
REG9
C26
0.1µF
N_OUT
1
3
1
2
3
V+
C29
0.1µF
2
5V
5V
C30
0.1µF
C22
2200pF
2kV
5V
+VIN
C16
3.3µF
C14
270µF
4V
C31
0.1µF
N5
5V
3
2
5
4
3
1
2
LXH
C33
1µF
10V
R29
1Ω
XFRMRH
CA
AN
VOUT
-VIN
1
U6
C15
270µF
4V
VCC
OUT
GND
VOUT
SGND
R26
560Ω
DRVB
R28
2kΩ
9
_______________________________________________________________________________________
Evaluates: MAX5051
D8
1
R16
10.5kΩ
1%
C4
4.7µF
C3
4.7µF
R11
360Ω
R3
2.2kΩ
C18
1000pF
C6
0.1µF
REG5
LXH
REG5 R27
10Ω
2
R25
100kΩ
R21
REG5 24.9kΩ
1%
+VIN
C24
1000pF
C17
0.33µF
VOUT
SENSE (+) SENSE (-)
Figure 12. MAX5051 EV Kit Schematic
Evaluates: MAX5051
MAX5051 Evaluation Kit
Figure 13. MAX5051 EV Kit Component Placement Guide—
Component Side
Figure 14. MAX5051 EV Kit PC Board Layout—Component
Side
Figure 15. MAX5051 EV Kit PC Board Layout—Inner Layer,
GND Plane
Figure 16. MAX5051 EV Kit PC Board Layout—Inner Layer,
VCC Plane
10
______________________________________________________________________________________
MAX5051 Evaluation Kit
Evaluates: MAX5051
Figure 17. MAX5051 EV Kit PC Board Layout—Solder Side
Figure 18. MAX5051 EV Kit Component Placement Guide—
Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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