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