top221 Power Integrations, Inc., top221 Datasheet - Page 14

• Manufacturer Part Number: top221
• Description: Three-terminal Off-line Pwm Switch
• Manufacturer: Power Integrations, Inc.

Figure 10. TOPSwitch Duty Cycle Measurement.
14
VOLTAGE
TOP221-227
DRAIN
Figure 12. Self-protection Current Limit Envelope.
D
7/01
0 V
HV
1.3
1.2
1.1
1.0
0.9
0.8
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
90%
0
1
t LEB (Blanking Time)
I INIT(MIN) @ 265 VAC
2
I INIT(MIN) @ 85 VAC
I LIMIT(MAX) @ 25 C
I LIMIT(MIN) @ 25 C
t 1
3
Time ( s)
10%
4
t 2
5
6
D =
7
t 1
t 2
PI-2039-040401
90%
8
Figure 13. Example of I
Figure 11. TOPSwitch CONTROL Pin I-V Characteristic.
CURRENT
0 A
DRAIN
120
100
80
60
40
20
0
Saturated Transformer.
0
Impedance
Dynamic
CONTROL Pin Voltage (V)
2
=
D
Slope
on Drain Current Waveform with
1
t
4
LEB
6
100 ns
8
10
I
PI-2031-040401
D