TOP242-250
Conditions
Parameter
Symbol
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 53
Min
Typ Max Units
(Unless Otherwise Specified)
OUTPUT (cont.)
Rise Time
tR
Measured in a Typical Flyback
Fall Time
tF
Converter Application
SUPPLY VOLTAGE CHARACTERISTICS
100
ns
50
ns
DRAIN Supply
Voltage
See Note E
36
V
Shunt Regulator
Voltage
VC(SHUNT)
IC = 4 mA
5.60
5.85
6.10
V
Shunt Regulator
Temperature Drift
±50
ppm/°C
Output MOSFET
TOP242-245
1.0
1.6
2.5
ICD1
Enabled
TOP246-249
1.2
2.2
3.2
Control Supply/
Discharge Current
VX, VL, VM = 0 V
TOP250
Output MOSFET
1.3
2.4
3.65
mA
ICD2
Disabled
0.3
0.6
1.3
VX, VL, VM = 0 V
NOTES:
A. For specifications with negative values, a negative temperature coefficient corresponds to an increase in
magnitude with increasing temperature, and a positive temperature coefficient corresponds to a decrease in
magnitude with increasing temperature.
B. Guaranteed by characterization. Not tested in production.
C. For externally adjusted current limit values, please refer to Figures 54b, 55b and 56b (Current Limit vs. External
Current Limit Resistance) in the Typical Performance Characteristics section. The tolerance specified is only valid
at full current limit.
D. Breakdown voltage may be checked against minimum BVDSS specification by ramping the DRAIN pin voltage up
to but not exceeding minimum BVDSS.
E. It is possible to start up and operate TOPSwitch-GX at DRAIN voltages well below 36 V. However, the CONTROL
pin charging current is reduced, which affects start-up time, auto-restart frequency, and auto-restart duty cycle.
Refer to Figure 68, the characteristic graph on CONTROL pin charge current (IC) vs. DRAIN voltage for low
voltage operation characteristics.
38 M
12/04