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UCC1808-X Datasheet

  • UCC1808-X

  • Low Power Current Mode Push-Pull PWM

  • 7頁

  • TI

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UCC1808-1/-2
UCC2808-1/-2
UCC3808-1/-2
Low Power Current Mode Push-Pull PWM
FEATURES
鈥?/div>
130碌A Typical Starting Current
鈥?/div>
1mA Typical Run Current
鈥?/div>
Operation to 1MHz
鈥?/div>
Internal Soft Start
鈥?/div>
On Chip Error Amplifier With 2MHz
Gain Bandwidth Product
鈥?/div>
On Chip VDD Clamping
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%.
鈥?/div>
Dual Output Drive Stages In Push-Pull The UCC3808 family offers a variety of package options temperature range
options, and choice of undervoltage lockout levels. The family has UVLO
Configuration
thresholds and hysteresis options for off-line and battery powered systems.
鈥?/div>
Output Drive Stages Capable Of
Thresholds are shown in the table below.
500mA Peak Source Current, 1A
Part Number
Turn on Threshold
Turn off Threshold
Peak Sink Current
UCCx808-1
UCCx808-2
12.5V
4.3V
8.3V
4.1V
BLOCK DIAGRAM
FB
2
COMP
1
CS
3
8
OVERCURRENT
COMPARATOR
0.75V
2.2V
VDD OK
S
Q
R
VDD鈥?V
1.2R
S
Q
R
0.5V
SOFT START
VOLTAGE
REFERENCE
VDD
R
6
OUTB
2.0V
0.5V
7
OSCILLATOR
0.8V
PWM
COMPARATOR
OUTA
PEAK CURRENT
COMPARATOR
14V
VDD
PWM
LATCH
S
Q
R
Q
T
Q
SLOPE = 1V/ms
5
GND
4
RC
UDG-99076
04/99

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