UCD7138 Texas instruments

UCD7138

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UCD7138

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Описание

The UCD7138 device is a 4-A and 6-A single-channel MOSFET driver with body-diode conduction sensing and reporting and is a high performance driver that allows the Texas Instruments UCD3138A digital PWM controller to achieve advanced synchronous-rectification (SR) control. The device contains a high-speed gate driver, a body-diode conduction-sensing circuit, and a turnon delay optimization circuit. The device is suitable for high-power, high-efficiency isolated converter applications where SR dead-time optimization is desired. The UCD7138 device offers asymmetrical rail-to-rail 4-A source and 6-A sink peak-current drive capability. The short propagation delay and fast rise and fall time allows efficient operation at high frequencies. An internal high-speed comparator with a –150-mV threshold detects the body-diode conduction and reports the information to the UCD3138A digital-power controller. The UCD7138 device is capable of sensing body-diode conduction time as low as 10 ns. The SR turnon edge is optimized by the UCD7138 device. The SR turnoff edge is optimized by the UCD3138A digital-power controller which analyzes the body-diode conduction information reported by the UCD7138 DTC pin. The benefits of the chipset include maximizing system efficiency by minimizing body-diode conduction time, robust and fast negative-current protection, and a simple interface.

Low-Side Gate Driver With Body-Diode
Conduction Sensing
Gate Turnoff Edge Body-Diode Conduction
Reporting
Gate Turnon Edge Delay Optimization
Works Together With the Dead-Time
Compensation (DTC) Module in the UCD3138A
Family of Digital Power Controllers:
- Automatic or Manual Dead-Time Adjustment of
  Gate Turnon and Turnoff Edges
- Negative Current Protection
–150-mV Body-Diode Conduction Sensing
Threshold
Able to Sense Body Diode Conduction Times as
Low as 10 ns
4-A Peak-Source and 6-A Peak-Sink Drive
Current
Fast Propagation Delays (14-ns Typical)
Fast Rise and Fall Times (5-ns Typical)
Up to 2-MHz Operating Frequency
4.5-V to 18-V Supply Range
Rail-to-Rail Drive Capability
V_CC Undervoltage Lockout (UVLO)
6-Pin 3-mm × 3-mm WSON-6 Package

Topology	LLC, Phase-shifted full bridge
Switching frequency (max) (kHz)	2000
Operating temperature range (°C)	-40 to 125
Control mode	Dead-time compensation
Device type	Controllers
Rating	Catalog