TNY274-280
NOTES:
A. ISꢀ is an accurate estimate of device controller current consumption at no-load, since operating frequency is so low under these
conditions. Total device consumption at no-load is the sum of ISꢀ and IDSS2
.
B. Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the DRAIN. An
alternative is to measure the BP/M pin current at 6.ꢀ V.
C. BP/M pin is not intended for sourcing supply current to external circuitry.
D. To ensure correct current limit it is recommended that nominal 0.ꢀ μF / ꢀ μF / ꢀ0 μF capacitors are used. In addition, the BP/M
capacitor value tolerance should be equal or better than indicated below across the ambient temperature range of the target
application. The minimum and maximum capacitor values are guaranteed by characterization.
Tolerance Relative to Nominal
Nominal BP/M
Capacitor Value
Pin Cap Value
Min
Max
+ꢀ005
+ꢀ005
NA
-605
-105
-105
0.ꢀ μF
ꢀ μF
ꢀ0 μF
E. For current limit at other di/dt values, refer to Figure 23.
F. TNY274 does not set an increased current limit value, but with a ꢀ0 μF BP/M pin capacitor the current limit is the same as with a
ꢀ μF BP/M pin capacitor (reduced current limit value).
G. This parameter is derived from characterization.
H. This parameter is derived from the change in current limit measured at ꢀX and 4X of the di/dt shown in the ILIMIT specification.
I.
I
DSSꢀ is the worst case OFF state leakage specification at 805 of BVDSS and maximum operating junction temperature. IDSS2 is a
typical specification under worst case application conditions (rectified 261 VAC) for no-load consumption calculations.
J. Breakdown voltage may be checked against minimum BVDSS specification by ramping the DRAIN pin voltage up to but not
exceeding minimum BVDSS
.
K. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to frequency).
17
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Rev. I 01/09
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