TNY278GN Power Integrations, TNY278GN Datasheet - Page 6

IC OFFLINE SWIT OVP OTP HV 8SMD

TNY278GN

Manufacturer Part Number
TNY278GN
Description
IC OFFLINE SWIT OVP OTP HV 8SMD
Manufacturer
Power Integrations
Series
TinySwitch®-IIIr
Datasheet

Specifications of TNY278GN

Output Isolation
Isolated
Frequency Range
124 ~ 140kHz
Voltage - Output
700V
Power (watts)
28W
Operating Temperature
-40°C ~ 150°C
Package / Case
8-SMD Gull Wing, 7 Leads
Output Voltage
12 V
Input / Supply Voltage (max)
265 VAC
Input / Supply Voltage (min)
85 VAC
Duty Cycle (max)
65 %
Switching Frequency
132 KHz
Supply Current
445 uA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
No. Of Outputs
1
Voltage Regulator Case Style
SMD
No. Of Pins
8
Base Number
278
Controller Type
PWM
Frequency
132kHz
Rohs Compliant
Yes
For Use With
596-1194 - KIT DESIGN REF TINYSWITCH-III
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Rev. I 01/09
all of its clock cycles (Figure 6). At slightly lower load, it will
“skip” additional cycles in order to maintain voltage regulation at
the power supply output (Figure 7). At medium loads, cycles
will be skipped and the current limit will be reduced (Figure 8).
At very light loads, the current limit will be reduced even further
At near maximum load, TinySwitch-III will conduct during nearly
200
100
400
200
Figure 10. Power Up with Optional External UV Resistor (4 MΩ)
200
100
400
300
200
100
10
Figure 12. Normal Power Down Timing (without UV).
0
5
0
0
0
0
6
0
0
V
V
V
Connected to EN/UV Pin.
DC-INPUT
DRAIN
BYPASS
TNY274-280
Time (ms)
Time (s)
.5
1
V
V
DC-INPUT
DRAIN
2
1
(Figure 9). Only a small percentage of cycles will occur to satisfy
the power consumption of the power supply.
The response time of the ON/OFF control scheme is very fast
compared to PWM control. This provides tight regulation and
excellent transient response.
200
100
Figure 13. Slow Power Down Timing with Optional External (4 MΩ) UV Resistor
200
100
Figure 11. Power Up Without Optional External UV Resistor
400
200
400
300
200
100
10
0
5
0
0
0
0
0
0
V
Connected to EN/UV Pin.
Connected to EN/UV Pin.
V
V
DC-INPUT
DRAIN
BYPASS
Time (ms)
Time (s)
2.5
1
V
DC-INPUT
V
DRAIN
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