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DESCRIPTION
4 Y: U/ ?' Z9 LThe ZCC6908HV is a Low-Drop Diode Emulator IC that, combined with an external5 t! Z/ H* b( T, p! D& M0 m$ b- i
switch, replaces Schottky diodes in high-efficiency Flyback converters. The chip/ w: \- O2 w. Q1 W! T
regulates the forward drop of an external Synchronous Rectifier (SR) MOSFET to4 F& u2 c0 X) g) V7 W; s7 a+ Q i
about 40mV and switches it off as soon as the voltage becomes negative. ZCC6908HV8 M& Z* R- M: `0 [ S* l& _# o: g
can generate its own supply voltage for battery charging applications with low output
( l1 M! T C! t; O" Y6 u9 Avoltage or high side rectification applications. A programmable ringing detection
$ ]8 d2 v- W9 ycircuitry prevents ZCC6908HV false turn-on during DCM and Quasi-Resonant
1 ~( i9 J+ s& `) x) Yoperations.
6 G5 H; S. \* m. A3 OZCC6908HV is available in space saving TSOT23-6 packages.' r" p" [6 r/ f' W6 x) I+ }
FEATURES' q' {* B9 R+ [! e7 v
● Operates in a wide output voltage range down to 0V" @- q7 n4 q" k2 V% f+ K
● Self-supplying for operation with low output voltage& E7 @1 i& ^! ^) t7 k" F
rectification without an auxiliary winding
* F; ]* c: s% A% ]5 q●· Works with 12V Standard and 5V Logic Level SR MOSFETS$ Z+ p Q5 _$ a1 \+ e( Y; z7 t) E
●· Compatible with Energy Star, 1W Standby Requirements
1 f$ f( y: p/ k) a( A: i●· <30ns Fast Turn-off and Turn-on Delay( b# a8 a2 _- f
●· <100uA Quiescent Current) `$ J8 C4 Q0 O
●· Supports DCM, Quasi-Resonant and CCM Operations) S. ]0 S3 E W% B5 o8 i2 j( C
●· Supports both High-side and Low-side Rectification" M. Q+ U) m- G5 T8 v/ s# V$ d
●· Power Savings of Up to 1.5W in a Typical Notebook Adapter0 c6 h2 x' @' \1 A, P8 c! y; A
●· TSOT23-6 Package Available
% t6 F- U3 ?- g: \- `APPLICATIONS
- |+ w, V, ^) Y2 F● + b# t/ b l, j5 {
Industrial Power Systems
R) ]. ?' p1 A+ H8 Z' F●
$ A" z) T& b8 J4 O3 KDistributed Power Systems
( Y" z1 a* \' g: b: L● " O b+ g6 _. m* O3 e2 J+ W
Battery Powered Systems6 H- `$ L: C. S3 a$ L* B2 W! l
●
' i% `% T' }# `5 MFlyback Converters5 S* r# y" n( s% z$ n f: \9 q
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发表于 2021-11-26 17:44
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