TDA8385 Philips Semiconductors, TDA8385 Datasheet - Page 2

• Manufacturer Part Number: TDA8385
• Description: Control circuit for a Self-Oscillating Power Supply SOPS
• Manufacturer: Philips Semiconductors

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Philips Semiconductors
BLOCK DIAGRAMS
March 1994
Control circuit for a Self-Oscillating
Power Supply (SOPS)
regulation indicator
differential amplifier
slow start voltage
current reference
feedback voltage
transistor-on
feed forward
output
setting input
output
setting
input
input
input
3
13
1
11 V diff
9
4
7
T on(min)
I ref
RIO
V
V
V ss
fb
fo
Fig.1 Block diagram; part A (continued in Fig.2; part B).
I ref
REFERENCE
REGULATION
INDICATOR
BLOCK
DIFFERENTIAL AMPLIFIER
V ref
2
50 A
29
5
(2.5 V)
V ref
V ts
STABILIZED
SUPPLY
V ss +
3
V stab
X
T on (min)
CLAMP
reset (28)
1
2.5 V
SUPPLY REFERENCES
V P
TCG
16
discharge
GND
4
3
quick
14
V TCG
V diff
SLOW START
27
DETECTOR
CONTROL PART
V P (min)
VOLTAGE
MINIMUM
19
CLAMP
7
V mv
charge
50 A
28
(28, 27, 23)
V ts
Preliminary specification
reset
latch
6
VII
III
I
MCD417
TDA8385