DATASHEET
ISL78420 FN8296
Rev 4.00
September 29, 2016 100V, 2A Peak, Half-Bridge Driver with Tri-Level PWM Input and Adjustable
Dead-Time
The ISL78420 is a 100V, 2A high frequency half-bridge NMOS
FET driver with a tri-level PWM input. With an operating supply
range of 8V to 14V and integrated high-side bootstrap bias, it
supports driving the high-side and low-side NMOS in 100V halfbridge applications.
This driver is designed to work in conjunction with the
ISL78220 and ISL78225 “Multi-Phase Interleaved Boost PWM
Controller” and the ISL78226 “6-Phase 12V/48V Bidirectional
Synchronous PWM Controller”. It can also be used in
applications where a standard half-bridge driver is needed. Features 114VDC bootstrap supply maximum voltage 2A source and sink driver for 100V half-bridge NMOS FETs Programmable dead-time prevents shoot-through;
adjustable from 35ns to 220ns with a single resistor Unique tri-level PWM input logic enables phase shedding
when using multiphase PWM controllers (e.g.
ISL78220/225/226) On-chip 1О© (dynamic) bootstrap diode This driver has a programmable dead-time to ensure
break-before-make operation between the high-side and lowside MOSFET. A resistor is used to set the dead-time from 35ns
to 220ns. 10ns rise and fall times with 1000pF load 8V to 14V operating voltage range VDD and Boostrap supply Undervoltage Lockout (UVLO) The PWM pin’s tri-level input allows control of the high-side
and low-side drivers with a single pin. When the PWM input is
at logic high, the high-side bridge FET is turned on and the lowside FET is off. When the input is at logic low, the low-side
bridge FET is turned on and the high-side FET is turned off.
When the input voltage is in mid-level state, both the high and …
