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UCC3808AN-2 PDF预览

UCC3808AN-2

更新时间: 2024-11-27 22:24:19
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
10页 160K
描述
LOW POWER CURRENT MODE PUSH-PULL PWM

UCC3808AN-2 数据手册

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ꢊ ꢋꢌ ꢍꢋ ꢌ ꢎꢏ ꢁꢀꢏ ꢏꢎꢐꢑ ꢒ ꢋꢓ ꢎ ꢍꢀ ꢔꢕꢆꢍꢀ ꢊꢊ ꢍ ꢌꢒ  
SLUS456D – APRIL 1999 - REVISED AUGUST 2002  
D OR N PACKAGE  
(TOP VIEW)  
D
D
D
D
D
D
D
Dual Output Drive Stages in Push-Pull  
Configuration  
Current Sense Discharge Transistor to  
Improve Dynamic Response  
1
2
3
4
8
7
6
5
VDD  
COMP  
OUTA  
OUTB  
GND  
FB  
CS  
RC  
130-µA Typical Starting Current  
1-mA Typical Run Current  
Operation to 1 MHz  
Internal Soft Start  
PW PACKAGE  
(TOP VIEW)  
On-Chip Error Amplifier With 2-MHz Gain  
Bandwidth Product  
1
8
7
6
5
OUTA  
VDD  
COMP  
FB  
OUTB  
GND  
RC  
D
On Chip VDD Clamping  
2
3
4
D
Output Drive Stages Capable of 500-mA  
Peak-Source Current, 1-A Peak-Sink Current  
CS  
description  
The UCC3808A is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808A  
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.  
The UCC3808A dual output drive stages are arranged in a push-pull configuration. Both outputs switch at half the  
oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to 200 ns  
depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle to less than  
50%.  
block diagram  
FB  
2
COMP  
1
CS  
3
8
7
VDD  
OVERCURRENT  
COMPARATOR  
22 k  
PEAK CURRENT  
COMPARATOR  
14 V  
0.75 V  
2.0 V  
0.5 V  
2.2 V  
S
OUTA  
VDD OK  
OSCILLATOR  
Q
Q
PWM  
LATCH  
R
S
R
1.2R  
Q
Q
S
Q
R
VDD–1 V  
T
PWM  
COMPARATOR  
VDD  
0.5 V  
R
SOFT START  
6
5
OUTB  
GND  
VOLTAGE  
REFERENCE  
SLOPE = 1 V/ms  
4
Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different.  
RC  
UDG-00097  
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.  
ꢑꢣ  
Copyright 2002, Texas Instruments Incorporated  
ꢟ ꢣ ꢠ ꢟꢘ ꢙꢭ ꢛꢚ ꢞ ꢦꢦ ꢤꢞ ꢜ ꢞ ꢝ ꢣ ꢟ ꢣ ꢜ ꢠ ꢨ  
1
www.ti.com  

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