ALTAIR04-900 Datasheet, PDF (9/29 Pages) STMicroelectronics – Off-line all-primary-sensing switching regulator

ALTAIR04-900
Electrical characteristics
Figure 3.
C_OSS Output capacitance variation
C (pF)
500
OSS
400
300
200
100
0
0
25
50
75
100
125
150
V (V)
DS
Figure 4. Off state drain and source current test circuit
I q(f ault ) _A
1 5V
A ^{I dss}
2. 5V +
-
F B/ Z C D
C OMP
VD D
D R AI N
C U R R EN T
C ON TR OL
I R EF
GND SOURCE
850 V
Note:
The measured I_DSS is the sum between the current across the start-up resistor and the
effective MOSFET’s off state drain current
Figure 5. Start-up current test circuit
Ic cst art-up A
1 1.8 V
2. 5V +
FB/ZCD ^-
C OMP
VDD
D R AIN
C U R R EN T
C ON TR OL
IR EF
GND SOURCE
Doc ID 18211 Rev 2
9/29