TNY274-280
Conditions
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 16
Parameter
Symbol
Min
Typ
Max
Units
(Unless Otherwise Specified)
OUTPUT (cont.)
Auto-Restart
ON-Time at fOSC
TJ = 25 °C
tAR
64
3
ms
%
See Note K
Auto-Restart
Duty Cycle
DCAR
TJ = 25 °C
NOTES:
A. IS1 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 IS1 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 6.1 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 0.1 µF / 1 µF / 10 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
Pin Cap Value
Capacitor Value
Min
MAX
+100%
+100%
NA
0.1 µF
1 µF
-60%
-50%
-50%
10 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 10 µF BP/M pin capacitor the current limit is the
same as with a 1 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 1X and 4X of the di/dt shown in the ILIMIT
specification.
I. IDSS1 is the worst case OFF state leakage specification at 80% of BVDSS and maximum operating junction
temperature. IDSS2 is a typical specification under worst case application conditions (rectified 265 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).
E
2/06
17
POWERINT [ Power Integrations ]
