UCC1810

更新时间： 2024-11-27 22:41:47

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
8页	471K
描述
Dual Channel Synchronized Current Mode PWM

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UCC1810 数据手册

UCC1810

UCC2810

UCC3810

Dual Channel Synchronized Current Mode PWM

FEATURES

DESCRIPTION

• Single Oscillator Synchronizes Two

PWMs

The UCC3810 is a high-speed BiCMOS integrated circuit which imple-

ments two synchronized pulse width modulators for use in off-line and

DC-to-DC power supplies.

• 150 A Startup Supply Current

• 2mA Operating Supply Current

• Operation to 1MHz

The UCC3810 provides perfect synchronization between two PWMs by us-

ing the same oscillator. The oscillator’s sawtooth waveform can be used for

slope compensation if required.

Using a toggle flip flop to alternate between modulators, the UCC3810 en-

sures that one PWM will not slave, interfere, or otherwise affect the other

PWM. This toggle flip flop also ensures that each PWM will be limited to

50% maximum duty cycle, insuring adequate off-time to reset magnetic el-

ements.

• Internal Soft Start

• Full-Cycle Fault Restart

• Internal Leading Edge Blanking of the

Current Sense Signal

This IC contains many of the same elements of the UC3842 current mode

controller family, combined with the enhancements of the UCC3802. This

minimizes power supply parts count. Enhancements include leading edge

blanking of the current sense signals, full cycle fault restart, CMOS output

drivers, and outputs which remain low even when the supply voltage is re-

moved.

• 1 Amp Totem Pole Outputs

• 75ns Typical Response from Current

Sense to Output

• 1.5% Tolerance Voltage Reference

BLOCK DIAGRAM

UDG-92062-1

02/99

12 3 4 5 6 7 8

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