Datasheet
General Description
The MAX13256 evaluation kit (EV kit) is a fully assembled
and tested PCB that contains the MAX13256 10W iso-
lated H-bridge DC-DC converter. The EV kit operates
from an 8V to 36V DC power source and the on-board 1:1
turns-ratio transformer from HALO sets the output voltage
range from 6.8V to 34.8V with a 300mA current limit.
The EV kit provides greater than 90% overall effi-
ciency at +24V between 2.2W and up to 8.3W output
power using an H-bridge DC-DC converter topology.
Input-ripple current and radiated noise are minimized
by the inherent balanced nature of the design with
no interruption in the input current. Undervoltage
lockout (UVLO), adjustable current limit, and thermal
shutdown provide for a robust 10W isolated supply. The
surface-mount transformer provides galvanic isolation
with the output powered from a full-wave rectifier circuit,
reducing the output-voltage ripple.
The EV kit circuit is configured as a full-wave rectifier,
with an output voltage that follows the input voltage but
is configurable for other topologies including a voltage
doubler, bipolar outputs, half-wave rectification, and a
push-pull rectifier.
Use HALO’s TGMR-512V6LF transformer for 4:1
turns-ratio operation providing up to 1A load capability.
The device is available in a 10-pin (3mm x 3mm) TDFN
package with an exposed pad.
Features
S 8V to 36V Input Supply Range
S Up to 90% Efficiency
S Full-Wave Rectified Output
S
Configurable for a Voltage Doubler, Bipolar
Half-Wave Rectifier, and Push-Pull Rectifier Outputs
S Internal or External Clock Operation Option
S Designed for 1500V
RMS
Isolation
S Proven PCB Layout
S Fully Assembled and Tested
DESIGNATION QTY DESCRIPTION
C1, C4 2
1FF Q10%, 50V C0G ceramic
capacitors (0805)
Murata GRM21BR71H105K
C2, C3, C8 0 Not installed, capacitors (0603)
C5 1
0.1FF Q10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
C6 1
2.2FF Q10%, 16V X7R ceramic
capacitor (0805)
Murata GRM21BR71C225K
C7 0 Not installed, capacitor (0805)
D1–D4 4
40V, 1A Schottky diodes (SMB)
Fairchild MBRS140
D5 1 Red LED (0603)
GND, SGND 2 Black test points
JU1 1 3-pin header
JU2, JU4 2 2-pin headers
JU3 1 Not installed, 2-pin header
DESIGNATION QTY DESCRIPTION
R1 1
1kI Q1% resistor (0603)
R2 1
750I Q5% resistor (0603)
R3 1
49.9kI Q1% resistor (0603)
R4 1
10kI Q5% resistor (0603)
R5–R8 0 Not installed, resistors (0603)
R9, R10 2
0I Q5% resistors (0603)
T1 1
1:1, 300mA turns transformer
(6 Gull Wing)
HALO TGMR-511V6LF
U1 1
H-bridge transformer driver
(10 TDFN-EP)
Maxim MAX13256ATB+
U2 1
5V LDO (6 TDFN-EP)
Maxim MAX15007BATT+
— 3 Shunts
— 1
PCB: MAX13256 EVALUATION
KIT
MAX13256 Evaluation Kit
Evaluates: MAX13256
_________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Component List
19-6021; Rev 0; 9/11
Ordering Information appears at end of data sheet.