ISL78420
100V, 2A Peak, Half-Bridge Driver with Tri-Level PWM Input and Adjustable Dead-Time
Key Features
- Programmable break-before-make dead-time prevents shoot-through and is adjustable up to 220ns
- Bootstrap supply maximum voltage to 114VDC
- Wide supply voltage range (8V to 14V)
- Supply undervoltage protection
- On-chip 1Ω bootstrap diode
- Unique tri-level PWM input logic enables phase shedding when using multi-phase PWM controllers (e.g. ISL78220/225)
- 9 Ld TDFN “B” package compliant with 100V conductor spacing guidelines per IPC-2221
- AEC-Q100 Qualified
Description
The ISL78420 is a 100V, high frequency, half-bridge MOSFET driver with a tri-level PWM input. This part is a derivative of the HIP2121 half-bridge driver. The non-automotive version of the ISL78420 is the HIP2124.
This driver is designed to work in conjunction with the ISL78220, “6-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement”. Equally, it can be used in most applications where a half-bridge driver is used.
This driver has a programmable dead-time to ensure break-before-make operation between the high-side and low-side drivers. A resistor is used to adjust the dead-time up to 220ns.
The tri-level input allows the PWM input to also function as a disable input. When the PWM input is a logic high, the high-side bridge FET is turned on and the low-side FET is off. When the input is a logic low, the low-side bridge FET is turned on and the high-side FET is turned off. When the input voltage is midrange, both the high and low-side bridge FETs are turned off.
The enable pin (EN), when low, drives both outputs to a low state. This input is used when the controller does not utilize a tri-state output. All logic inputs are VDD tolerant.
Two package options are provided. The 10 Ld 4x4 DFN package has standard pinouts. The 9 Ld 4x4 DFN package omits pin 2 to comply with 100V conductor spacing per IPC-2221.
Applications
- Automotive applications
- Multi-phase boost (ISL78220/225)
- Half-bridge DC/DC converter
- Class-D amplifiers
- Forward converter with active clamp
