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UCC3808D-2 |UCC3808D2UNITRODEN/a475avai1
UCC3808DTR-2 |UCC3808DTR2TI N/a2500avai1
UCC3808N-2 |UCC3808N2TIN/a110avai1


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UCC3808D-2-UCC3808DTR-2-UCC3808N-2
Low Power Current Mode Push-Pull PWM
UCC3808D-1
0.1µF10µF
20 kΩ
NS1
NS2NP1
NP2 680µF 0.01µF
470pF
4700pF 20 kΩ
19.1 kΩ
COMP
19.1 kΩ
200Ω
LOOPB
LOOPA
2.2Ω
0.2Ω2 kΩ
330pF
1000pF
62Ω62Ω
1000pF
2.2Ω
51 kΩ
1/4 W
0.47µF4700µFVIN VTO72V
BYV
BYV
32CTQ030ER28
8:2
5V50W678321
H11A1
PRIMARY
GROUND
IRF640 IRF640
20 kΩ
240Ω
0.1µF TL431
10Ω
EF25 7µHmH
DF02SGICT
VDD OUTA OUTB GNDCSFBCOMP
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UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2

SLUS168E–APR 1999–REVISED AUGUST 2015
UCCx808-x Low Power Current Mode Push-Pull PWM Features 3 Description

The UCCx808-xisa familyof BiCMOS push-pull, Dual Output Drive Stagesin Push-Pull high-speed, low-power, pulse-width modulators. TheConfiguration UCCx808 containsallof the control and drive circuitry• 130-μA Typical Starting Current required for offline or DC-to-DC fixed frequency 1-mA Typical Run Current current-mode switching power supplies with minimal
external parts count.• Operationto 1-MHz Internal Soft-Start The UCCx808-x dual output drive stages are
arrangedina push-pull configuration. Both outputs• On-Chip Error Amplifier With 2-MHz Gain switchat half the oscillator frequency usinga toggleBandwidth Product flip-flop. The dead time between the two outputsis• On-Chip VDD Clamping typically 60nsto 200ns depending on the valuesof Output Drive Stages CapableOf 500-mA Peak the timing capacitor and resistors, thus limiting each
output stage duty cycleto less than 50%.Source Current, 1-A Peak Sink Current
Device Information(1)2 Applications
• Server and Desktop Power Supplies• Telecom Power Supplies• DC-DC Converters• Switched-Mode Power Supplies
(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Simplified Schematic
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