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
EXTERNAL
CURRENT
LIMIT (X)
CURRENT LIMIT
COMPARATOR
VBG + VT
STOP LOGIC
VOLTAGE
MONITOR (V)
HYSTERETIC
THERMAL
SHUTDOWN
SOURCE (S)
1 V
CONTROLLED
TURN-ON
GATE DRIVER
STOP SOFT
V
OVP OV/
START
UV
DMAX
LINE
SENSE
OSCILLATOR
WITH JITTER
DCMAX
66k/132k
DCMAX
CLOCK
S
R
Q
F REDUCTION
LEADING
EDGE
FREQUENCY
(F)
BLANKING
F REDUCTION
SOFT START
IFB
IPS(UPPER)
IPS(LOWER)
OFF
PWM
KPS(UPPER)
KPS(LOWER)
SOURCE (S)
PI-4511-082907
图 3c. 功能结构框图（TOP254-258 Y封装和eSIP封装）
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
SHUTDOWN
SOURCE (S)
1 V
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
SOURCE (S)
BLANKING
F REDUCTION
SOFT START
IFB
IPS(UPPER)
IPS(LOWER)
OFF
PWM
KPS(UPPER)
KPS(LOWER)
SIGNAL
GROUND (G)
PI-4974-122607
图 3d. 功能结构框图（TOP259YN、TOP260YN和TOP261YN）
5
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