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UCC3808PWTR-2

更新时间： 2024-11-26 23:39:03
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其他 - ETC 控制器
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9页 154K
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SMPS Controller

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UCC3808PWTR-2 数据手册

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SLUS168D – APRIL 1999 – REVISED AUGUST 2002  
D OR N PACKAGE  
(TOP VIEW)  
D
Dual Output Drive Stages in Push-Pull  
Configuration  
D
D
D
D
D
130-µA Typical Starting Current  
1-mA Typical Run Current  
Operation to 1-MHz  
1
2
3
4
8
7
6
5
VDD  
COMP  
OUTA  
OUTB  
GND  
FB  
CS  
RC  
Internal Soft Start  
On Chip Error Amplifier With 2-MHz Gain  
Bandwidth Product  
PW PACKAGE  
(TOP VIEW)  
D
On Chip VDD Clamping  
1
2
3
4
8
7
6
5
OUTA  
VDD  
OUTB  
GND  
RC  
D
Output Drive Stages Capable Of 500-mA  
Peak Source Current, 1-A Peak Sink Current  
COMP  
FB  
CS  
description  
The UCC3808 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808  
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 UCC3808 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%. (continued)  
block diagram  
FB  
2
COMP  
1
CS  
3
8
7
VDD  
OVERCURRENT  
COMPARATOR  
22 k Ω  
PEAK CURRENT  
COMPARATOR  
14 V  
0.75 V  
2.0 V  
0.5 V  
2.2 V  
OUTA  
VDD OK  
OSCILLATOR  
S
R
S
R
Q
Q
PWM  
LATCH  
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
RC  
Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different.  
UDG-02116  
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.  
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Copyright 2002, Texas Instruments Incorporated  
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