UCC3808-2 Datasheet PDF - Unitrode

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UCC3808-2
Unitrode

Part Number UCC3808-2
Description Low Power Current Mode Push-Pull PWM
Page 4 Pages


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Low Power Current Mode Push-Pull PWM
UCC1808-1/-2
UCC2808-1/-2
UCC3808-1/-2
PRELIMINARY
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
BLOCK DIAGRAM
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 re-
quired 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 configura-
tion. 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 op-
tions, and choice of undervoltage lockout levels. The family has UVLO thresh-
olds and hysteresis options for off-line and battery powered systems.
Thresholds are shown in the table below.
Part Number
UCCx808-1
UCCx808-2
Turn on Threshold
12.5V
4.3V
Turn off Threshold
8.3V
4.1V
9/97
UDG-97008

UCC3808-2 datasheet pdf
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UCC3808-2 pdf
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