Datasheet > UCC1808-X

UCC1808-X

更新时间： 2024-11-27 21:54:51

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
7页	150K
描述
Low Power Current Mode Push-Pull PWM

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中文翻译

获取价格

数据手册

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UCC1808-X 数据手册

UCC1808-1/-2

UCC2808-1/-2

UCC3808-1/-2

Low Power Current Mode Push-Pull PWM

FEATURES

DESCRIPTION

• 130µA Typical Starting Current

The UCC3808 is a family of BiCMOS push-pull, high-speed, low power,

pulse width modulators. The UCC3808 contains all of the control and drive

circuitry required for off-line or DC-to-DC fixed frequency current-mode

switching power supplies with minimal external parts count.

• 1mA Typical Run Current

• Operation to 1MHz

• Internal Soft Start

The UCC3808 dual output drive stages are arranged in a push-pull configu-

ration. Both outputs switch at half the oscillator frequency using a toggle

flip-flop. The dead time between the two outputs is typically 60ns to 200ns

depending on the values of the timing capacitor and resistors, thus limits

each output stage duty cycle to less than 50%.

• On Chip Error Amplifier With 2MHz

Gain Bandwidth Product

• On Chip VDD Clamping

The UCC3808 family offers a variety of package options temperature range

options, and choice of undervoltage lockout levels. The family has UVLO

thresholds and hysteresis options for off-line and battery powered systems.

Thresholds are shown in the table below.

• Dual Output Drive Stages In Push-Pull

Configuration

• Output Drive Stages Capable Of

500mA Peak Source Current, 1A

Peak Sink Current

Part Number

UCCx808-1

UCCx808-2

Turn on Threshold

Turn off Threshold

12.5V

4.3V

8.3V

4.1V

BLOCK DIAGRAM

COMP

VDD

OVERCURRENT

COMPARATOR

PEAK CURRENT

COMPARATOR

14V

0.75V

2.0V

0.5V

2.2V

OUTA

VDD OK

VDD–1V

OSCILLATOR

0.8V

PWM

COMPARATOR

PWM

LATCH

1.2R

VDD

0.5V

SOFT START

OUTB

GND

VOLTAGE

REFERENCE

SLOPE = 1V/ms

UDG-99076

04/99

12 3 4 5 6 7

中文翻译

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