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ISL78420 Datasheet

Half-Bridge Driver

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100V, 2A Peak, Half-Bridge Driver with Tri-Level PWM
Input and Adjustable Dead-Time
ISL78420
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.
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
Applications
• Automotive applications
• Multi-phase boost (ISL78220/225)
• Half-bridge DC/DC converter
• Class-D amplifiers
• Forward converter with active clamp
Related Literature
FN7668 HIP2120, HIP2121 “100V, 2A Peak, High Frequency
Half-Bridge Drivers with Adjustable Dead Time Control and
PWM Input”
FN8363 HIP2124, “100V, 2A Peak, Half Bridge Driver with
Tri-level Input and Adjustable Dead Time” (non-automotive)
FN7688 ISL78220, “6-Phase Interleaved Boost PWM
Controller with Light Load Efficiency Enhancement”
FN7909 ISL78225, “4-Phase Interleaved Boost PWM
Controller with Light Load Efficiency Enhancement”
HALF BRIDGE
ISL78420
VDD
HB
PWM
CONTROLLER
PWM
EN
RDT
HO
HS
VSS LO
EPAD
100V MAX
SECONDARY
CIRCUITS
FEEDBACK
WITH
ISOLATION
FIGURE 1. TYPICAL APPLICATION
200
160
140
120
100
80
60
40
20
8 16 24 32 40 48 56 64
RDT (kΩ)
FIGURE 2. DEAD-TIME vs TIMING RESISTOR
80
January 24, 2014
FN8296.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.


Intersil Electronic Components Datasheet

ISL78420 Datasheet

Half-Bridge Driver

No Preview Available !

Block Diagram
VDD
5V
PWM
EN
RDT
-
+
-
+
5V
210k
ISL78420
UNDER
VOLTAGE
LEVEL
SHIFT
DELAY
DELAY
UNDER
VOLTAGE
ISL78420
HB
HO
HS
LO
VSS
Pin Configurations
ISL78420ARTAZ
(10 LD 4X4 TDFN)
TOP VIEW
VDD 1
HB 2
HO 3
HS 4
NC 5
EPAD
10 LO
9 VSS
8 PWM
7 EN
6 RDT
ISL78420ARTBZ
(9 LD 4X4 TDFN)
TOP VIEW
VDD 1
HB 3
HO 4
HS 5
EPAD
10 LO
9 VSS
8 PWM
7 EN
6 RDT
EPAD
Pin Descriptions
10 9
LD LD SYMBOL
DESCRIPTION
11
VDD Positive supply voltage for lower gate driver.
Decouple this pin to ground with a 4.7µF or larger
ceramic capacitor to VSS
23
HB High-side bootstrap supply voltage referenced to
HS. Connect bootstrap capacitor to this pin and HS.
3 4 HO High-side output connected to gate of high-side FET.
45
HS High-side source connect to source of high-side FET.
Connect bootstrap capacitor to this pin and HB.
88
PWM
PWM input. For PWM = 5V, HO = 1, LO = 0. For
PWM = 0V, HO = 0, LO = 1. For PWM = 2.5V,
HO = LO = 0.
7 7 EN Output enable, when low, HO = LO = 0
9 9 VSS Negative voltage supply, Connected to ground.
10 10 LO Low-side output. Connect to gate of low-side FET.
5-
NC No Connect. This pin is isolated from all other pins.
May optionally be connected to VSS. Note that on
the 9 Ld package, there is no pin present at the
location normally occupied by pin 2.
66
RDT A resistor connected between this pin and VSS adds
dead time by adding delay time to the falling and
rising edges of the PWM input.
- - EPAD The epad is electrically isolated. It is recommended
that the epad be connected to the VSS plane for
heat removal.
2 FN8296.2
January 24, 2014


Part Number ISL78420
Description Half-Bridge Driver
Maker Intersil Corporation
Total Page 16 Pages
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