TLS1242

更新时间： 2024-11-20 12:22:35

品牌	Logo	应用领域
德州仪器 - TI		功率因数校正控制器
页数	文件大小	规格书
13页	243K
描述
CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR

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TLS1242 数据手册

TLS1242, TLS1244

CURRENT-MODE PWM CONTROLLER

WITH POWER-FACTOR CORRECTOR

SLVS161 – MAY 1997

N OR DW PACKAGE

(TOP VIEW)

Single-Chip Solution for High-Power-Factor

Switching Power Supply

Current-Mode PWM Controller

COMP

REF

Fixed-Frequency Average-Current

Power-Factor Corrector (PFC)

Synchronized with PWM Controller

ISENS1

OUT1

PGND

OUT2

PKLIM

IAC

Full Range ac Operation

Low Start-Up Current

GND

ISENS2

CAO

Pulse-by-Pulse Current Limiting for PFC

Undervoltage Lockout with Hysteresis

Internally Trimmed Bandgap Reference

External Synchronous Pin

RMS

MULT

SYNC

VSENSE

Overvoltage Protection for PFC

Upper 8 Pins Configuration Same as

UC3842

description

The TLS1242 and TLS1244 are designed as optimal high-power-factor switching power supply systems with

minimum external components. The current-mode PWM controller and the fixed-frequency average-current

power-factor corrector (PFC) of each device are combined into a 20-pin DIP package. Internally implemented

circuits include: undervoltage lockout (UVLO), featuring a low start-up current; a precision reference that can

be trimmed for accuracy at the error amplifier input; a multiplier; two PWM comparators; overvoltage protection

(OVP); and two totem-pole output stages designed to source or sink current. The output stage is suitable for

driving n-channel MOSFETs, and is low when in the off state.

The fixed-frequency average-current-mode power-factor-correction controller circuit is synchronized with a

current-mode PWM controller internally. Fixed-frequency power-factor correction helps prevent problems in

frequency-sensitive applications such as video monitor, telecom, RF transmitters, and medical imaging. The

synchronization of the PFC with the PWM controller helps reduce EMI problems as well.

The pin assignment of both the TLS1242 and the TLS1244 is intended to accommodate the UC3842/3844 as

well, if PFC is not required in the application. The upper pins (1, 2, 3, 4, 17, 18, 19 and 20) have the same pin

assignment as the UC3842, making the current-mode SPS application more flexible.

The PWM portion of the TLS1242 can operate to duty cycle approaching 100%. A duty cycle range of 0 to 50%

is obtained using the TLS1244.

The TLS1242 and TLS1244 are characterized for operation from 0°C to 70°C.

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77251–1443

12 3 4 5 6 7...13

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与TLS1242相关器件

型号	品牌	获取价格	描述	数据表
TLS1242N	TI	获取价格	CURRENT-MODE PWM CONTROLLER WITH POWER-FACTOR CORRECTOR
TLS125	LITTELFUSE	获取价格	TLS Series Telecommunications Power Fuse
TLS1255	TI	获取价格	VIDEO PREAMPLIFIER SYSTEM WITH ON-SCREEN DISPLAY (OSD)MIXER
TLS1255N	TI	获取价格	Video Preamplifier System 28-PDIP
TLS1255N	ROCHESTER	获取价格	3 CHANNEL, VIDEO PREAMPLIFIER, PDIP28
TLS125D0EJ	INFINEON	获取价格	OPTIREG™ TLS125D0EJ 是一款高精度的单片集成低压差线性跟随稳压器，采用
TLS125L	LITTELFUSE	获取价格	Electric Fuse, 125A, 170VDC, 100000A (IR), Inline/holder, ROHS COMPLIANT
TLS125LB	LITTELFUSE	获取价格	暂无描述
TLS125LR	LITTELFUSE	获取价格	TLS125LR是一款电信保险丝，额定电流为125安培。
TLS125LS	LITTELFUSE	获取价格	Electric Fuse, 125A, 170VDC, 100000A (IR), Inline/holder, ROHS COMPLIANT

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