UCC2897A系列介绍资料

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UCC2897A

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具有 P 沟道钳位 FET 和线路过压保护的 110V 有源钳位电流模式 PWM 控制器

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The UCC2897A PWM controller simplifies implementation of the various active clamp or reset and synchronous rectifier switching power topologies.

The UCC2897A is a peak current-mode fixed-frequency high-performance pulse-width modulator. The controller includes the logic and the drive capability for the P-channel auxiliary switch along with a simple method of programming the critical delays for proper active-clamp operation.

Features include an internal programmable slope compensation circuit, precise D_MAX limit, and a synchronizable oscillator with an internal-timing capacitor. An accurate line-monitoring function also programs the ON and OFF transitions of the converter with regard to the bulk input voltage, VIN.

The UCC2897A adds a second-level hiccup-mode current-sense threshold, bi-directional synchronization and input-overvoltage protection functionalities. The UCC2897A is offered in 20-pin TSSOP (PW) and 20-pin QFN (RGP) packages.

Low-output jitter
Soft-stop shutdown of MAIN and AUX
110-V input startup function
Ideal for active-clamp, reset-forward, flyback and synchronous rectifier uses
Provides complementary auxiliary driver with programmable dead time (Turn-On Delay) between AUX and MAIN switches
Peak current-mode control with 0.5-V cycle-by-cycle current limiting
TrueDrive™ 2-A Sink, 2-A source outputs
Trimmed internal-bandgap reference for accurate line UV and line OV threshold
Programmable slope compensation
High-performance 1-MHz synchronizable oscillator with internal timing capacitor
Precise programmable maximum duty cycle
PB-free lead finish package

Topology	Active-clamp forward
Control mode	Current
Duty cycle (max) (%)	74
Switching frequency (max) (kHz)	1000
Features	High-voltage startup, Input line monitor, Programmable slope compensation, Soft start, Soft switching, Supports PFET clamp
UVLO thresholds on/off (V)	12.7/8
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Gate drive (typ) (A)	2
Vin (max) (V)	16

TSSOP (PW)	20	41.6 mm² 6.5 x 6.4
VQFN (RGP)	20	16 mm² 4 x 4

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UCC2897A

具有 P 沟道钳位 FET 和线路过压保护的 110V 有源钳位电流模式 PWM 控制器

4000-306-326