Datasheet > FAN3122T

FAN3122T

更新时间： 2024-11-20 10:26:43

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		驱动器栅极栅极驱动
页数	文件大小	规格书
12页	459K
描述
Application Review and Comparative Evaluation of Low-Side Gate Drivers

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FAN3122T 数据手册

www.fairchildsemi.com

AN-6069

Application Review and Comparative Evaluation

of Low-Side Gate Drivers

Summary

Low-side drivers are also used to drive transformers, which

Power MOSFETs require a gate drive circuit to translate the

on/off signals from an analog or digital controller into the

power signals necessary to control the MOSFET. This paper

provides details of MOSFET switching action in

provide isolated MOSFET gate drive circuits or

communication across the power supply isolation boundary.

In these applications, a driver is required to handle concerns

specific to transformer drive, discussed later.

applications with clamped inductive load, when used as a

secondary synchronous rectifier, and driving pulse/gate

drive transformers. Potential driver solutions, including

discrete and integrated driver designs, are discussed.

MOSFET driver datasheet current ratings are examined and

circuits are presented to assist with evaluating the

performance of drivers on the lab bench.

Low-side drivers may seem a mundane topic; several papers

have been written on the subject. Though often presented as

an ideal voltage source that can source or sink current

determined by the circuit’s series impedance, the current

available from a driver is, in fact, limited by the discrete or

integrated circuit design. This note reviews the basic

requirements of drivers from an application viewpoint, then

investigates methods for testing and evaluating the current

capability of drivers on the lab bench.

Introduction

In many low-to-medium power applications, a low-side

(ground referenced) MOSFET is driven by the output pin of

a PWM control IC to switch an inductive load. This solution

is acceptable if the PWM output circuitry can drive the

MOSFET with acceptable switching times without

dissipating excessive power. As the system power

requirements grow, the number of switches and associated

drive circuitry increases. As control circuit complexity

increases, it is becoming more common for IC

Clamped Inductive Switching

The simplified boost converter in Figure 1 provides the

schematic for a typical power circuit with a clamped

inductive load. When the MOSFET Q is turned on, the input

voltage V_INis applied across inductor L and the current

ramps up in a linear fashion to store energy in the inductor.

When the MOSFET turns off, the inductor current flows

through diode D1 and delivers energy to C_OUTand R_LOADat

voltage V_DC. The inductor is assumed large enough to

maintain current constant during the switching interval.

manufacturers to omit onboard drivers because of grounding

and noise problems.

Synchronous rectifiers (SRs) are increasingly used to replace

standard rectifiers when high efficiency and increased power

density are important. It is common for isolated power

stages delivering tens of amps to parallel two or more low-

resistance MOSFETs in each rectifying leg, and these

devices require current pulses reaching several amps to

switch the devices in the sub-100ns timeframe desired.

External drivers can provide these high-current pulses and a

means to implement timing to eliminate shoot-through and

optimize efficiency to control the SR operation. In addition,

drivers can translate logic control voltages to the most

effective MOSFET drive level.

V_IN

V_DC

V_DD

R_LOAD

C_BYP

C_OUT

R_G

V_OUT

I_G

Figure 1. Simplified Boost Converter

Rev. 1.0.3 • 1/6/10

www.fairchildsemi.com

12 3 4 5 6 7...12

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与FAN3122T相关器件

型号	品牌	获取价格	描述	数据表
FAN3122TM1X-F085	ONSEMI	获取价格	单 9 A 高速，低压侧门极驱动器
FAN3122TMPX	FAIRCHILD	获取价格	Single 9A High-Speed, Low-Side Gate Driver
FAN3122TMPX	ONSEMI	获取价格	TTL 输入，非反相单输出，峰值 11.4A 汲电流，10.6A 源电流，低压侧门极驱动器
FAN3122TMX	FAIRCHILD	获取价格	Single 9A High-Speed, Low-Side Gate Driver
FAN3122TMX	ONSEMI	获取价格	TTL 输入，非反相单输出，峰值 11.4A 汲电流，10.6A 源电流，低压侧门极驱动器
FAN3122TMX_F085	FAIRCHILD	获取价格	Single 9-A High-Speed, Low-Side Gate Driver
FAN3122TMX_F085_12	FAIRCHILD	获取价格	Single 9A High-Speed, Low-Side Gate Driver
FAN3122TMX-F085	ONSEMI	获取价格	单 9 A 高速，低压侧门极驱动器
FAN3180	ONSEMI	获取价格	Single 2-A Low-Side Driver with 3.3-V LDO
FAN3180	FAIRCHILD	获取价格	Single 2-A Low-Side Driver with 3.3-V LDO

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