ALTAIR05T-800 Datasheet, PDF (9/28 Pages) STMicroelectronics – Off-line all-primary-sensing switching regulator

ALTAIR05T-800
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
14 V
A ^{Ids s}
CDC
2. 5V +
-
FB /ZC D
C OMP
VD D
D R AI N
C U R R EN T
C ON TR OL
IR E F
GND SOURCE
Vin
75 0V
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
CDC
2. 5V +
-
FB/ ZC D
C OMP
VDD
D R AIN
C U R R EN T
C ON TR OL
IR EF
GND SOURCE
Doc ID 17957 Rev 1
9/28