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UCC1808- Datasheet(PDF) 1 Page - Texas Instruments

Part No. UCC1808-
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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UCC1808- Datasheet(HTML) 1 Page - Texas Instruments

   
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UCC1808-1/-2
UCC2808-1/-2
UCC3808-1/-2
04/99
FEATURES
• 130µA Typical Starting Current
• 1mA Typical Run Current
• Operation to 1MHz
• Internal Soft Start
• On Chip Error Amplifier With 2MHz
Gain Bandwidth Product
• On Chip VDD Clamping
• Dual Output Drive Stages In Push-Pull
Configuration
• Output Drive Stages Capable Of
500mA Peak Source Current, 1A
Peak Sink Current
Low Power Current Mode Push-Pull PWM
3
1
2
8
7
6
5
4
OSCILLATOR
S
Q
R
0.8V
RC
1.2R
R
0.5V
PEAK CURRENT
COMPARATOR
Q
Q
T
S
Q
R
S
Q
R
VDD
VOLTAGE
REFERENCE
14V
PWM
COMPARATOR
PWM
LATCH
SOFT START
0.5V
VDD–1V
0.75V
2.2V
2.0V
FB
COMP
CS
VDD
OUTA
OUTB
GND
SLOPE = 1V/ms
VDD OK
OVERCURRENT
COMPARATOR
BLOCK DIAGRAM
UDG-99076
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 configu-
ration. Both outputs switch at half the oscillator frequency using a toggle
flip-flop. The dead time between the two outputs is typically 60ns to 200ns
depending on the values of the timing capacitor and resistors, thus limits
each output stage duty cycle to less than 50%.
The UCC3808 family offers a variety of package options temperature range
options, and choice of undervoltage lockout levels. The family has UVLO
thresholds and hysteresis options for off-line and battery powered systems.
Thresholds are shown in the table below.
Part Number
Turn on Threshold
Turn off Threshold
UCCx808-1
12.5V
8.3V
UCCx808-2
4.3V
4.1V


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