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Using the ISL6420 PWM Controller
Evaluation Board
Application Note
November 10, 2004
AN1159.0
Advanced Single Synchronous Buck
Pulse-Width Modulation (PWM) Controller
The ISL6420 simplifies the work of implementing a complete
control and protection scheme for a high-performance DC-
DC buck converter. Designed to drive N-channel MOSFETs
in a synchronous rectified buck topology, the ISL6420
integrates the control, output adjustment, monitoring and
protection functions into a single package.
The ISL6420 provides simple, single feedback loop, voltage
mode control with fast transient response. The output
voltage of the converter can be precisely regulated to as low
as 0.6V, with a maximum tolerance of ±1.0% over
temperature and line voltage variations.
Quick Start Evaluation
The evaluation board is shipped “ready to use” right from the
box. The board has been optimized for a 12V input from a
standard power supply but can accept a range from 4.5V to
16V. The board can be connected to the source and load
with the help of stand-off terminals provided.
Recommended Test Equipment
To test the functionality of the ISL6420, the following
equipment is recommended:
? An adjustable 12V, 8A capable bench power supply
? An electronic load
? Four channel oscilloscope with probes
The operating frequency is fully adjustable from 100kHz to
?
Precision digital multimeter
1.4MHz. High frequency operation offers cost and space
savings.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/μs slew rate that enables high converter
bandwidth for fast transient response. The resulting PWM
duty cycle ranges from 0% to 100%. Selecting the capacitor
value from the ENSS pin to ground sets a fully adjustable
PWM soft-start; while pulling ENSS pin LOW disables the
controller.
The ISL6420 monitors the output voltage and generates a
PGOOD (power good) signal when soft-start is complete and
the output is within regulation. A built-in overvoltage
protection circuit prevents the output voltage from going
above typically 115% of the set point. Protection from
overcurrent conditions is provided by monitoring the r DS(ON)
of the upper MOSFET to inhibit the PWM operation
appropriately. This approach simplifies the implementation
and improves efficiency by eliminating the need for a current
sensing resistor. The IC also features voltage margining for
networking DC-DC converter applications.
ISL6420 Reference Design
The ISL6420 evaluation board highlights the operation of the
IC in an embedded application. The evaluation board is
configured for an output voltage of 3.3V and 10A maximum
load.
TABLE 1.
Power and Load Connections
Refer to the ISL6420EVAL3 schematic for reference
designators.
Jumper Settings - JP1 controls what terminal post is
connected to the VIN pin of the IC (See the Input Voltage
explanation below). JP2 and JP3, when shorted with a
jumper, pull the GPIO2 and GPIO1 pins to GND. With the
jumpers removed, GPIO2 and GPIO1 will be floating.
Input Voltage - The ISL6420EVAL3 reference design is
optimized for an input supply of 12V, however, the input
supply can range from 4.5V to 16V.
If using an input supply ranging from 5.6V to 16V, short pins
1 and 2 of jumper JP1. In this mode, the VIN post (P1) is
connected to the drain of the upper MOSFET and the VIN
pin of the IC and the chip is powered by the 5V output
(VCC5, post P5) of the internal LDO.
To use a 5V ±10% input supply, short pins 2 and 3 of JP1
and connect the power supply to the VIN (P1) post and the
VCC5 (P5) post. This will disable the internal LDO and the
chip will be powered by the input power supply.
CAUTION: When JP1 pins 2 & 3 are shorted, applying voltages
>6V can damage the IC.
For quick start evaluation, adjust the power supply to provide
the 12V input voltage and short pins 1 and 2 of JP1. With the
power supply turned off, connect the positive lead of the 12V
supply to the VIN post (P1) and the ground lead to the GND
BOARD NAME
ISL6420EVAL3
IC
ISL6420IR
PACKAGE
20 Ld QFN
post (P2).
Output Voltage Loading and Monitoring - Connect the
positive lead of the electronic load and the positive lead of a
digital multimeter to the VOUT post (P3) and the ground lead
to the GND post (P4). You can use the scope probe terminal
(SC1) to monitor VOUT with an oscilloscope.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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ISL6420IA-TK 功能描述:IC REG CTRLR BUCK PWM VM 20-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR)
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ISL6420IAZS2698 制造商:Intersil Corporation 功能描述:PB-FREE SYNC BUCK PWM CONT. WITH 4.5V-16V INPUT,20LD QSOP - Rail/Tube
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ISL6420IAZ-TKS2698 制造商:Intersil Corporation 功能描述:PB-FREE SYNC BUCK PWM CONT. WITH 4.5V-16V INPUT,20LD QSOP, 1 - Tape and Reel
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