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UCC25705DGKTR Datasheet

  • UCC25705DGKTR

  • HIGH - SPEED VOLTAGE MODE PULSE MODE WIDTH MODULATOR

  • 18頁

  • TI

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UCC25705, UCC25706, UCC35705, UCC35706
HIGH SPEED VOLTAGE MODE PULSE WIDTH MODULATOR
SLUS473A 鈥?NOVEMBER 1999 鈥?REVISED MARCH 2001
D
Greater Than 4-MHz Operation
D
Integrated Oscillator / Voltage Feed Forward
D
D
D
D
D
D
D
Compensation
>4:1 Input Voltage Range
25-ns Current Limit Delay
Programmable Maximum Duty Cycle Clamp
Optocoupler Interface
50-碌A(chǔ) Start-Up Current
4.2-mA Operating Current @ 1 MHz
Smallest Footprint of the 8-pin MSOP
Package Minimizes Board Area and Height
DGK PACKAGE
(TOP VIEW)
D, OR P PACKAGE
(TOP VIEW)
ILIM
FB
VFF
DISCH
8
7
6
5
1
2
3
4
8
7
6
5
VDD
OUT
GND
RC
1
2
3
4
ILIM
FB
VFF
DISCH
VDD
OUT
GND
RC
description
The UCC35705 and UCC35706 devices are 8-pin voltage mode primary side controllers with fast over-current
protection. These devices are used as core high-speed building blocks in high performance isolated and non-isolated
power converters.
UCC35705/UCC35706 devices feature a high speed oscillator with integrated feed-forward compensation for
improved converter performance. A typical current sense to output delay time of 25 ns provides fast response to
overload conditions. The IC also provides an accurate programmable maximum duty cycle clamp for increased
protection which can also be disabled for the oscillator to run at maximum possible duty cycle.
Two UVLO options are offered. The UCC35705 with lower turn-on voltage is intended for dc-to-dc converters while
the higher turn-on voltage and the wider UVLO range of the UCC35706 is better suited for offline applications.
The UCC35705/UCC35706 family is offered in 8-pin MSOP (DGK), SOIC (D) and PDIP (P) packages.
typical application schematic
+
V
IN
鈥?/div>
+
V
OUT
鈥?/div>
4
DISCH
VDD
FB
8
2
TPS2829
5
3
RC
VFF
OUT
7
FET DRIVER
6
GND
ILIM
1
SOFT
START
CIRCUIT
UCC35705/6
MODE = 1
UDG-99181
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
錚?/div>
2001, Texas Instruments Incorporated
www.ti.com
1

UCC25705DGKTR 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電壓模式

  • 1

  • 4MHz

  • 93%

  • 8.2 V ~ 15 V

  • 無

  • 是

  • 是

  • 無

  • 無

  • 無

  • 無

  • 是

  • -40°C ~ 85°C

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 帶卷 (TR)

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