Datasheet > UCC1809-2

UCC1809-2

更新时间： 2024-11-27 22:34:51

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
7页	134K
描述
Economy Primary Side Controller

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中文翻译

获取价格

数据手册

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UCC1809-2 数据手册

application

INFO

UCC1809-1/-2

UCC2809-1/-2

UCC3809-1/-2

available

Economy Primary Side Controller

FEATURES

DESCRIPTION

• User Programmable Soft Start With

The UCC3809 family of BCDMOS economy low power integrated circuits

contains all the control and drive circuitry required for off-line and isolated

DC-to-DC fixed frequency current mode switching power supplies with

minimal external parts count. Internally implemented circuits include

undervoltage lockout featuring startup current less than 100µA, a user ac-

cessible voltage reference, logic to ensure latched operation, a PWM com-

parator, and a totem pole output stage to sink or source peak current. The

output stage, suitable for driving N-Channel MOSFETs, is low in the off

state.

Active Low Shutdown

• User Programmable Maximum Duty

Cycle

• Accessible 5V Reference

• Undervoltage Lockout

• Operation to 1MHz

• 0.4A Source/0.8A Sink FET Driver

• Low 100µA Startup Current

Oscillator frequency and maximum duty cycle are programmed with two

resistors and a capacitor. The UCC3809 family also features full cycle soft

start.

The family has UVLO thresholds and hysteresis levels for off-line and

DC-to-DC systems as shown in the table to the left.

PART

TURN ON

TURN OFF

The UCC3809 and the UCC2809 are offered in the 8 pin SOIC (D), PDIP

(N), TSSOP (PW), and MSOP (P) packages. The small TSSOP and

MSOP packages make the device ideal for applications where board

space and height are at a premium.

NUMBER THRESHOLD THRESHOLD

UCCX809-1

UCCX809-2

10V

15V

TYPICAL APPLICATION DIAGRAM

START

REF

VDD

NOISE

FILTER

REF

+5V

FEEDBACK

6µA

REF

SLOPE

COMP

OUT

CURRENT

SENSE

0.5V

15/8V

10/8V

DISABLE

UVLO

17.5V

VDD

RT1

RT2

PWM

LATCH

OUT

GND

CLK

OSC

REF

UDG-99036

SLUS166A - NOVEMBER 1999

12 3 4 5 6 7

中文翻译

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