High Current Half-Bridge with Over Current Shutdown

Rajkumar Sharma
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SKU: EL120048
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The project presented here is a versatile high voltage Half-Bridge with Over-Current Shutdown. The project is built using LT1158 IC from Analog Devices. It is suited for many applications as listed below. A single input pin on the LT1158 synchronously controls two N-channel power MOSFETs IRF3710 in a totem pole configuration. Unique adaptive protection against shoot-through currents eliminates all matching requirements for the two MOSFETs. This greatly eases the design of high-efficiency motor control and switching regulator systems. A continuous current limit loop in the LT1158 regulates short-circuit current in the top power MOSFET. Higher start-up currents are allowed as long as the MOSFET V_DS does not exceed 1.2V. By returning the FAULT output to the enable input, the LT1158 will automatically shut down in the event of a fault and retry when an internal pull-up current has recharged the enable capacitor. An on-chip charge pump is switched in when needed to turn on the top N-channel MOSFET continuously. Special circuitry ensures that the top side gate drive is safely maintained in the transition between PWM and DC operation. The gate-to-source voltages are internally limited to 14.5V when operating at higher supply voltages. The circuit requires a single PWM signal, duty cycle 0 to 99%, frequency 0 to 100Khz. Working supply range 12V to 24V DC.

Note: The Half-bridge driver is configured as over-current shutdown, don’t install R7 resistor and C8 capacitor if this feature is not required. In this case, Fault and Enable pins are available for the external interface. Read the datasheet of LT1158 for more information.

Connections

CN1 Connector: DC Supply input 12V to 24V DC
CN2 Connector: Load (Motor, Lamp, LED, DC-DC Converter)
CN3 Connector: Pin 1 VCC, Pin 2 Enable, Pin 3 Fault, Pin 4 PWM In, Pin 5 GND

Applications

PWM of High Current Resistive and Inductive Loads, Such as Heaters, LED, Lamps, Motors
Half-Bridge and Full-Bridge Motor Control
Synchronous Step-Down Switching Regulators
Three-Phase Brushless Motor Drive
High Current Transducer Drivers

Features

Supply Range 12V to 24V
Load up to 7Amps
Over Current Shutdown Approx. 7.5Amps
PWM Frequency Input Range 0 to 100Khz
PWM Duty Cycle 0 to 99%
D2 Power LED
Continuous Current Limit Protection
Auto Shutdown and Retry Capability
Built-In Gate Voltage Protection
Compatible with Current-Sensing MOSFETs
TTL/CMOS Input Levels
PCB Dimensions 69.22 x 55.88mm

Schematic

Parts List

NO.	QNTY.	REF.	DESC	MANUFACTURER	SUPPLIER	PART NO
1	2	CN1,CN3	2 PIN BARRIER BLOCK PITCH 9.53MM	TE CONNECTIVITY	DIGIKEY	A98481-ND
2	1	CN2	5 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5318-ND
3	2	C3,C7	0.1uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
4	1	C2	10uF/35V SMD SIZE 1206	MURATA/YAGEO	DIGIKEY
5	1	C4	1000uF/35V	ILLINIOS	DIGIKEY	1572-1316-ND
6	1	C5	0.01uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
7	2	R4,C6	DNP
8	1	C8	0.33uF/35 SMD SIZE 1206	MURATA/YAGEO	DIGIKEY
9	1	D1	1N4148 SMD	MICROCHIP	DIGIKEY	1086-15170-ND
10	1	D2	LED SMD SIZE 0805	LITE ON INC	DIGIKEY	160-1427-1-ND
11	2	Q1,Q2	IRF3710	INFINION	DIGIKEY	IRF3710PBF-ND
12	2	R1,R5	24E 1% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
13	2	R2,R3	0.05E 1% SMD SIZE 2512	MURATA/YAGEO	DIGIKEY
14	1	R6	3K3 5% SMD SIZE 1206	MURATA/YAGEO	DIGIKEY
15	1	R7	1K 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
16	1	U1	LT1158	ANALOG DEVICE	DIGIKEY	LT1158CSW#TRPBFTR-ND
17	1	C1	0.1uF/50V SMD SIZE 1206	MURATA/YAGEO	DIGIKEY