UCC2891

所属类别：ACDC-和-DCDC-电源
产品名称：电流模式有源钳位 PWM 控制器
厂商：TI
生产批号：10+
封装：16SOIC, 16TSSOP
库存状态：有库存
库存量：5886
最低订购量：1
详细资料：

Product Introduction

The PWM controllers UCC2891/2/3/4 series are designed to simplify the implementation of a wide range of active clamping/reset switching power supply topologies.

The UCC289x is a peak current mode, fixed frequency, high-performance pulse width modulator. It includes logic and the ability to drive a critical delay auxiliary switch for a simple way to operate with the correct programming active clamping.

The initial start-up includes a 110-V start-up regulator at UCC2891/3 and provides keep-alive power on standby.

Other features include an internal programmable slope compensation circuit, precise D-maximum limit, and a resistor-programmable synchronized oscillator. The conversion function of the accurate online monitoring scheme is also on\x92s and OFF conversion about the large capacity input voltage.

characteristic

Low output jitter
Soft stop shutdown primary and auxiliary
Active clamping/reset forward, ideal for flyback converters
Supplemental auxiliary drivers are available with programmable dead time (on-delay) between the AUX and the main switch
The peak current mode controls the periodic current limit
110-V input starts the regulator pair UCC2891/3
TrueDrive™2 sinks, 2 A source outputs
Accurate line UV and OV threshold lines
Programmable slope compensation
1.0 - MHz synchronized oscillator
Precisely programmable maximum duty cycle
Programmable soft start
apply
- 150 watt to 700 watt switching power supply
- High efficiency, low EMI/RFI off-line or DC/DC converter
- Server, 48 V telecommunications, data communications
- High power converter, LCD TV and plasma TV

ICs related to UCC2891 include:

Model	Manufacturers	lot number	encapsulation	illustrate
E2891	ERICSSON	05+	SOP	High frequency module
2SK2891-01	FUJI	05+	TO-3P	Original
UCC2891	TI	10+	16SOIC, 16TSSOP	Current-mode active clamping PWM controller
UCC2891D	TI	0601+	SOIC-16

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UCC2891

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