TOP252-262
VC
0
1
CONTROL (C)
DRAIN (D)
ZC
INTERNAL
SUPPLY
-
SHUNT REGULATOR/
ERROR AMPLIFIER
+
-
+
SOFT START
5.8 V
4.8 V
-
5.8 V
+
INTERNAL UV
COMPARATOR
KPS(UPPER)
-
IFB
+
V
I (LIMIT)
CURRENT
LIMIT
ADJUST
KPS(LOWER)
-
÷ 16
ON/OFF
+
SHUTDOWN/
AUTO-RESTART
CURRENT LIMIT
COMPARATOR
VBG + VT
STOP LOGIC
HYSTERETIC
THERMAL
MULTI-
FUNCTION (M)
SOURCE (S)
CONTROLLED
SHUTDOWN
TURN-ON
GATE DRIVER
STOP SOFT
V
OVP OV/
UV
START
DMAX
LINE
SENSE
OSCILLATOR
WITH JITTER
DCMAX
DCMAX
CLOCK
F REDUCTION
S
R
Q
LEADING
EDGE
BLANKING
F REDUCTION
SOFT START
IFB
IPS(UPPER)
IPS(LOWER)
PWM
OFF
KPS(UPPER)
KPS(LOWER)
SOURCE (S)
PI-4508-120307
Figure 3a. Functional Block Diagram (P and G Packages).
VC
0
1
CONTROL (C)
ZC
DRAIN (D)
INTERNAL
SUPPLY
-
SHUNT REGULATOR/
ERROR AMPLIFIER
+
-
+
SOFT START
5.8 V
4.8 V
-
5.8 V
+
INTERNAL UV
COMPARATOR
KPS(UPPER)
-
IFB
+
V
I (LIMIT)
CURRENT
LIMIT
ADJUST
KPS(LOWER)
-
÷ 16
ON/OFF
+
SHUTDOWN/
AUTO-RESTART
EXTERNAL
CURRENT
LIMIT (X)
CURRENT LIMIT
COMPARATOR
VBG + VT
STOP LOGIC
VOLTAGE
MONITOR (V)
HYSTERETIC
THERMAL
SOURCE (S)
1 V
SHUTDOWN
CONTROLLED
TURN-ON
GATE DRIVER
STOP SOFT
V
OVP OV/
START
UV
DMAX
LINE
SENSE
OSCILLATOR
WITH JITTER
DCMAX
DCMAX
CLOCK
S
R
Q
F REDUCTION
LEADING
EDGE
BLANKING
F REDUCTION
SOFT START
IFB
OFF
PWM
KPS(UPPER)
KPS(LOWER)
IPS(UPPER)
IPS(LOWER)
SOURCE (S)
PI-4643-082907
Figure 3b. Functional Block Diagram (M Package).
4
Rev. F 01/09
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