top209 Power Integrations, Inc., top209 Datasheet - Page 2

• Manufacturer Part Number: top209
• Description: Three-terminal Off-line Pwm Switch
• Manufacturer: Power Integrations, Inc.

2
Figure 2. Functional Block Diagram.
Pin Functional Description
DRAIN Pin:
Output MOSFET drain connection. Provides internal bias
current during start-up operation via an internal switched high-
voltage current source. Internal current sense point.
CONTROL Pin:
Error amplifier and feedback current input pin for duty cycle
control. Internal shunt regulator connection to provide internal
bias current during normal operation. It is also used as the
supply bypass and auto-restart/compensation capacitor
connection point.
SOURCE Pin:
Control circuit common, internally connected to output
MOSFET source.
SOURCE (HV RTN) Pin:
Output MOSFET source connection for high voltage return.
2
TOP209/210
CONTROL
A
8/97
R E
Z C
SHUNT REGULATOR/
I FB
ERROR AMPLIFIER
OSCILLATOR
V C
CLOCK
D MAX
SAW
+
-
5.7 V
COMPARATOR
5.7 V
4.7 V
PWM
+
-
AUTO-RESTART
HYSTERESIS
SHUTDOWN
SHUTDOWN/
POWER-UP
THERMAL
+
-
RESET
WITH
0
1
INTERNAL
SUPPLY
Figure 3. Pin Configuration.
8
S
R
Q
Q
CONTROL
SOURCE
N/C
N/C
G Package (SMD-8)
P Package (DIP-8)
2
1
3
4
BLANKING
LEADING
EDGE
CONTROLLED
TURN-ON
DRIVER
GATE
+
-
MINIMUM
ON-TIME
DELAY
8
7
6
5
SOURCE (HV RTN)
N/C
N/C
DRAIN
V I
LIMIT
PI-1742-011796
PI—2044-040901
DRAIN
SOURCE