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DESCRIPTION4 C8 f* A& {) e* l: ]9 N* e
The ZCC6908HV is a Low-Drop Diode Emulator IC that, combined with an external
9 b1 `0 \7 C: gswitch, replaces Schottky diodes in high-efficiency Flyback converters. The chip
& O) \% s* l$ }regulates the forward drop of an external Synchronous Rectifier (SR) MOSFET to
' [) t! o% y% Qabout 40mV and switches it off as soon as the voltage becomes negative. ZCC6908HV0 c, I3 s) x( U. q
can generate its own supply voltage for battery charging applications with low output5 n p" }* k, D5 _
voltage or high side rectification applications. A programmable ringing detection
2 |& Q3 X0 Z. k: Scircuitry prevents ZCC6908HV false turn-on during DCM and Quasi-Resonant
9 L1 d6 l( G% }& W5 _operations.8 m- T( g* f s2 H3 I% b( H
ZCC6908HV is available in space saving TSOT23-6 packages.
' C% j- i8 p' G7 s$ J3 h8 y- X; }7 c' _FEATURES
7 R# d' M6 r$ s% w) T6 f6 j- r● Operates in a wide output voltage range down to 0V4 X' h. z2 t' i, u9 C* U8 @
● Self-supplying for operation with low output voltage
& V/ i4 p- I7 O0 ]rectification without an auxiliary winding5 i" L& i- G) g7 h3 r
●· Works with 12V Standard and 5V Logic Level SR MOSFETS) f7 [ q H1 k/ s- }6 n# L
●· Compatible with Energy Star, 1W Standby Requirements* J4 A- D! g, d* r; x( P3 ]6 Q: U6 }
●· <30ns Fast Turn-off and Turn-on Delay
3 t! c+ w' M Q. ], }7 U●· <100uA Quiescent Current
( F! N" B% a7 F0 ?3 }* V! ?●· Supports DCM, Quasi-Resonant and CCM Operations
! L; m; M7 y: _5 J6 V6 K●· Supports both High-side and Low-side Rectification
; v, R. b, n7 P+ i+ N3 Q+ M●· Power Savings of Up to 1.5W in a Typical Notebook Adapter; R" U5 v$ y7 @/ O
●· TSOT23-6 Package Available( T( a3 V, g0 s5 e" P
APPLICATIONS- D/ h* F2 Q' C I2 `0 _
● - C; f4 _% l& U8 W4 T
Industrial Power Systems5 _6 w1 r; r$ l/ X* C/ A( u" e0 a
● 0 r5 v: W( ^( ^/ @+ s2 ~
Distributed Power Systems! C" f# R. n, ~( i5 `) x3 Q, i% C
●
. A! T+ t0 q% \( C/ c; xBattery Powered Systems
3 S+ v, k$ ^% X7 G1 R- W- U6 E● ' N5 z* q Q% G# u% Q+ @
Flyback Converters 3 J; N5 e6 `/ N8 o" d' i% H
8 N8 a4 E6 v+ C
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发表于 2021-11-19 18:01
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