Netzteil - Grundig Davio 20 Service Manual

Hauptplatte – Netzteil / Main Board – Power Supply
1
IN 2
CURRENT
INTERNAL
SENSE
REGULATORS
AMPLIFIER
OSCILLATOR
SLOPE
COMP
40/385KHz
CLK
+ + S
R
0.7V
-- SHUTDOWN -- CURRENT
COMPARATOR
COMPARATOR
EN 7
LOCKOUT
COMPARATOR
--
2.3V/
2.6V
+
+ --
MP1593
3A, 28V, 385KHz
FREQUENCY -- 0.7V 1.22V + ERROR
AMPLIFIER STEP-DOWN CONVERTER
FOLDBACK
COMPARATOR
5 6 8
FB COMP SS
+ 5V
--
1 BS
M1
Q
Q
3 SW
M2
1.8V
4 GND