ISL78420_15 Datasheet, PDF (1/18 Pages) Intersil Corporation – 100V, 2A Peak, Half-Bridge Driver with Tri-Level PWM Input and Adjustable Dead-Time

DATASHEET
100V, 2A Peak, Half-Bridge Driver with Tri-Level PWM
Input and Adjustable Dead-Time
ISL78420
The ISL78420 is a 100V, 2A high frequency half-bridge NMOS
FET driver with a tri-level PWM input. With an operating supply
voltage range of 8V to 14V, it supports a 114V bootstrap bias for
driving the high-side NMOS in 100V half-bridge applications. This
part is a derivative of the industrial family of HIP2120-HIP2123
100V half-bridge drivers.
This driver is designed to work in conjunction with the ISL78220
and ISL78225 “Multi-Phase Interleaved Boost PWM Controller
with Light Load Efficiency Enhancement”. It can also be used in
applications where a standard half-bridge driver is needed.
This driver has a programmable dead-time to ensure
break-before-make operation between the high-side and low-side
MOSFET. A resistor is used to set the dead-time from 35ns to
220ns.
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 low-side 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 low-side bridge
FETs are turned off. The enable pin (EN), when low, also turns
both bridge FETs off. This EN input can be used when the
controller driving the ISL78420 does not utilize a tri-level output.
Both PWM and EN logic inputs are V_DD tolerant.
The ISL78420 is offered in a 14 Ld HTSSOP package and
complies with 100V conductor spacing per IPC-2221. The device
is Automotive AEC-Q100 qualified for the temperature range of
-40°C to +125°C.
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)
• On-chip 1Ω (dynamic) bootstrap diode
• 10ns rise and fall times with 1000pF load
• 8V to 14V operating voltage range
• Supply undervoltage lockout (UVLO)
• 14 Ld HTSSOP package compliant with 100V conductor
spacing guidelines per IPC-2221
• AEC-Q100 qualified
Applications
• Automotive applications
• Multiphase boost (ISL78220/225)
• Half-bridge DC/DC converter
• Class-D amplifiers
Related Literature
• HIP2120, HIP2121, “100V, 2A Peak, High Frequency Half-
Bridge Drivers with Adjustable Dead Time Control and PWM
Input”
• ISL78220, “6-Phase Interleaved Boost PWM Controller with
Light Load Efficiency Enhancement”
• ISL78225, “4-Phase Interleaved Boost PWM Controller with
Light Load Efficiency Enhancement”
• UG006, ISL78420EVAL1Z Evaluation Board User Guide
VIN
ISL78225
4‐Phase
Boost
Controller
PWM1
PWM2
PWM3
PWM4
PWM
HB
VDD
EN
RDT
ISL78420
HO
HS
VSS
LO
EPAD
VOUT
PHASE #1
PHASE #2
PHASE #3
PHASE #4
FIGURE 1. NMOS DRIVER FOR 4-PHASE BOOST CONVERTER
320
240
200
160
T = -40°C
140
120
T = +125°C
100
80
T = +85°C
60
T = +25°C
40
20
8
T_A= -40°C to +125°C
16
24 32 40 48 56 64 72 80
RESISTOR ON RDT PIN (kΩ)
FIGURE 2. DEAD-TIME vs TIMING RESISTOR
November 6, 2014
1
FN8296.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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