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UCC3808 Datasheet(PDF) 1 Page - Texas Instruments

Part No. UCC3808
Description  LOW POWER CURRENT MODE PUSH-PULL PWM
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC3808 Datasheet(HTML) 1 Page - Texas Instruments

 
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UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2
LOW POWER CURRENT MODE PUSH-PULL PWM
SLUS168D – APRIL 1999 – REVISED AUGUST 2002
1
www.ti.com
D Dual Output Drive Stages in Push-Pull
Configuration
D 130-µA Typical Starting Current
D 1-mA Typical Run Current
D Operation to 1-MHz
D Internal Soft Start
D On Chip Error Amplifier With 2-MHz Gain
Bandwidth Product
D On Chip VDD Clamping
D Output Drive Stages Capable Of 500-mA
Peak Source Current, 1-A Peak Sink Current
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
UDG-02116
3
1
2
8
7
6
5
4
OSCILLATOR
S
Q
R
RC
1.2R
R
0.5 V
PEAK CURRENT
COMPARATOR
Q
Q
T
S
Q
R
S
Q
R
VDD
VOLTAGE
REFERENCE
14 V
PWM
COMPARATOR
PWM
LATCH
SOFT START
0.5 V
VDD–1 V
0.75 V
2.2 V
2.0 V
FB
COMP
CS
VDD
OUTA
OUTB
GND
SLOPE = 1 V/ms
VDD OK
OVERCURRENT
COMPARATOR
22 k
Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different.
Copyright
 2002, Texas Instruments Incorporated
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.
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.
1
2
3
4
8
7
6
5
COMP
FB
CS
RC
VDD
OUTA
OUTB
GND
D OR N PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
PW PACKAGE
(TOP VIEW)
OUTB
GND
RC
CS
OUTA
VDD
COMP
FB


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