MAX770 5V步降型变换器具有变压器隔离的反馈.pdf

文档介绍：DESIGN SHOWCASE
5V
1 5V
( 5V ) ( IC1 3 ) 100kHz 250ns
(T2 IC2) ( ) 9 ˚
( IC1 3 ) IC2
5V 6mA
5V ( VOUT
C1 R1 )
(IC2) T2 VOUT C1/R1 ( 1
5V )
( CR2–CR5) R1 R1/R2
( C4) IC1 ()
(CR1 R3 R4)
(
1N4148 T2
) -TC
500VRMS ( 1500VRMS
1/2VOUT T1 VOUT )
CR6 V
T1 NSQ03A04 OUT
10V TO 16V 1 9 +5V AT 1A
C7
GND C6 33µF
100µF 10 2 20V ISOGND
20V
IC1
Q1
RFD14N05L
MAX770
1 8
C1 R1 EXT CS
100pF 220k 2 7
V+ GND R6
3 6
FB AGND
4 5
SHDN REF
C2 R2 C3
1nF 360k µF R5
220k
C5
µ 5 T2 4
R4 F CR2 CR4
47k MBR0520 MBR0520 2, 3
CR3 CR5 8 1 1 8
CR1 MBR0520 MBR0520 D1 D2
MBR0520 C4 2 GND1 GND2 7
150pF 3 6
R3 FS VCC
47k 4 SD . 5
IC2
ISOLATION
BARRIER MAX845
1 5V
14