The JTMA7120 ,JTMA7120A is a fixed 300kHz frequency, voltage

1.产品概述 2.产品特点 3.应用范围 4.下载产品资料PDF文档
5.产品封装图 6.电路原理图 7.功能概述 8.相关产品

一,产品概述(General Description)
The JTMA7120 is a fixed 300kHz frequency, voltage mode, and
synchronous PWM controller. The device drives two low cost N-channel
MOSFETs and is de-signed to work with single 5~12V or two supply
voltage(s), providing excellent regulation for load transients.
The JTMA7120 integrates controls, monitoring, and protection functions
into a single 8-pin package to provide a low cost and perfect power solution.
A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent
wrong logic controls. An internal 0.8V reference provides low output voltage
down to 0.8V for further applications. An built-in digital soft-start with fixed
soft-start interval prevents the output voltage from overshoot as well as limits
the input current. The controller’s over-current protection monitors the output
current by using the voltage drop across the low-side MOSFET’s RDS(ON),
eliminating the need of a current sensing resistor. Additional under voltage and
over voltage protections monitor the voltage on FB pin for short-circuit and
over-voltage protections. The over-current protection cycles the soft-start
function until 4 over-current events are counted.Pulling and holding the voltage
on OCSET pin below 0.15V with an open drain device shuts down the controller.

二.产品特点(Features)
1.)Operating with Single 5~12V Supply Voltage
2.)or Two Supply Voltages
3.)Drive Dual Low Cost N-Channel MOSFETs
Adaptive Shoot-Through Protection
4.)Built-in Feedback Compensation
Voltage-Mode PWM Control
0~100% Duty Ratio
Fast Transient Response
5.)±2% 0.8V Reference
Over Line, Load Regulation, and Operating
6.)Temperature Programmable Over-Current Protection
Using RDS(ON) of Low-Side MOSFET
7.)Hiccup-Mode Under-Voltage Protection
8.)118% Over-Voltage Protection
9.)Adjustable Output Voltage
10.)Small Converter Size
300kHz Constant Switching Frequency
Small SOP-8 Package
11.)Built-In Digital Soft-Start
12.)Shutdown Control Using an External MOSFET
13.)Lead Free and Green Devices Available

三,应用范围 (Applications)
Motherboard
Graphics Card
High Current, up to 20A, DC-DC Converters

四.下载产品资料PDF文档

JTM7120

五,产品封装图 (Package)
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