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參數(shù)資料
| 型號： | UCC2581D |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Very low drop voltage regulators with inhibit |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 241K |
| 代理商： | UCC2581D |
UCC1581
UCC2581
UCC3581
MARCH 1999 - REVISED SEPTEMBER 2000 - SLUS295A
FEATURES
Low 85
μ
A Startup Current
Low 300
μ
A Operating Current
Automatically Disabled
Startup Preregulator
Programmable Minimum Duty
Cycle with Cycle Skipping
Programmable Maximum
Duty Cycle
Output Current 1A Peak
Source and Sink
Programmable Soft Start
Programmable Oscillator
Frequency
External Oscillator
Synchronization Capability
Micropower Voltage Mode PWM
BLOCK DIAGRAM
DESCRIPTION
The UCC3581 voltage mode pulse width modulator is de-
signed to control low power isolated DC - DC converters
in applications such as Subscriber Line Power (ISDN
I.430). Primarily used for single switch forward and
flyback converters, the UCC3581 features BiCMOS cir-
cuitry for low startup and operating current, while main-
taining
the
ability
to
drive
frequencies up to 100kHz. The UCC3581 oscillator al-
lows the flexibility to program both the frequency and the
maximum duty cycle with two resistors and a capacitor. A
TTL level input is also provided to allow synchronization
to an external frequency source.
power
MOSFETs
at
The UCC3581 includes programmable soft start circuitry,
overcurrent detection, a 7.5V linear preregulator to con-
trol chip V
DD
during startup, and an on-board 4.0V logic
supply.
The UCC3581 provides functions to maximize light load
efficiency that are not normally found in PWM controllers.
A linear preregulator driver in conjunction with an exter-
nal depletion mode N-MOSFET provides initial controller
power. Once the bootstrap supply is functional, the
preregulator is shut down to conserve power. During light
load, power is saved by providing a programmable mini-
mum duty cycle clamp. When a duty cycle below the
minimum is called for, the modulator skips cycles to pro-
vide the correct average duty cycle required for output
regulation. This effectively reduces the switching fre-
quency, saving significant gate drive and power stage
losses.
The UCC3581 is available in 14-pin plastic and ceramic
dual-in-line packages and in a 14-pin narrow body small
outline IC package (SOIC). The UCC1581 is specified for
operation from
55
°
C to +125
°
C, the UCC2581 is speci-
fied for operation from
40
°
C to +85
°
C, and the
UCC3581 is specified for operation from 0
°
C to +70
°
C.
Note: Pin Connection shown for 14-pin Package
UDG-95011-1
application
INFO
available
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UCC2626DW | Very low drop voltage regulators with inhibit |
| UCC2626N | Very low drop voltage regulators with inhibit |
| UCC2626PW | Very low drop voltage regulators with inhibit |
| UCC3626DW | 1.2 V to 37 V adjustable voltage regulators |
| UCC3626N | 1.2 V to 37 V adjustable voltage regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC2581DG | 制造商:Texas Instruments 功能描述: |
| UCC2581DG4 | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Micropower RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC2581DTR | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Micropower RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC2581DTRG4 | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Micropower RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| UCC2581J | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Micropower Voltage Mode PWM |
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