tny274 Power Integrations, Inc., tny274 Datasheet - Page 18

• Manufacturer Part Number: tny274
• Description: Energy Ef?cient, Of?ine Switcher With Enhanced Flexibility And Extended Power Range
• Manufacturer: Power Integrations, Inc.

NOTES:
A. I
B Since the output MOSFET is switching, it is difficult to isolate the switching current from the supply current at the
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
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
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 I
I. I
J. Breakdown voltage may be checked against minimum BV
K. Auto-restart on time has the same temperature characteristics as the oscillator (inversely proportional to
18
low under these conditions. Total device consumption at no-load is the sum of I
DRAIN. An alternative is to measure the BP/M pin current at 6.1 V.
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.
same as with a 1 µF BP/M pin capacitor (reduced current limit value).
specification.
DSS1
temperature. I
consumption calculations.
to but not exceeding minimum BV
frequency).
TNY274-280
S1
Nominal BP/M
Pin Cap Value
is an accurate estimate of device controller current consumption at no-load, since operating frequency is so
G
6/06
is the worst case OFF state leakage specification at 80% of BV
0.1 µF
10 µF
1 µF
DSS2
is a typical specification under worst case application conditions (rectified 265 VAC) for no-load
Tolerance Relative to Nominal
-60%
-50%
-50%
Min
Capacitor Value
DSS
.
+100%
+100%
MAX
NA
DSS
specification by ramping the DRAIN pin voltage up
DSS
and maximum operating junction
S1
and I
DSS2
.
LIMIT