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TNY253 Datasheet(PDF) 5 Page - Power Integrations, Inc.

Part # TNY253
Description  Energy Efficient, Low Power Off-line Switchers
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TNY253 Datasheet(HTML) 5 Page - Power Integrations, Inc.

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Rev. F 08/16
5
www.power.com
TNY253/254/255
TNY253/254/255
Figure 6. TinySwitch Operation at Light Load.
Figure 7. TinySwitch Power-Up Timing Diagram.
Figure 8. TinySwitch Power Down Timing Diagram.
PI-2261-061198
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
BYPASS Pin Capacitor
The BYPASS pin uses a small 0.1 µF ceramic capacitor for
decoupling the internal power supply of the TinySwitch.
Application Examples
Television Standby
TinySwitch is an ideal solution for low cost, high efficiency
standby power supplies used in consumer electronic products
such as TVs. Figure 9 shows a 7.5 V, 1.3 W flyback circuit that
uses TNY253 for implementing a TV standby supply. The circuit
operates from the DC high-voltage already available from the
main power supply. This input voltage can range from 120 to
375 VDC depending on the inputAC voltage range that the TV
is rated for. Capacitor C1 filters the high-voltage DC supply,
and is necessary only if there is a long trace length from the
source of the DC supply to the inputs of the TV standby circuit.
The high-voltage DC bus is applied to the series combination
of the primary winding of T1 and the integrated high-voltage
MOSFET inside the TNY253. The low operating frequency of
the TNY253 (44 kHz), allows a low cost snubber circuit C2 and
R1 to be used in place of a primary clamp circuit. In addition
to limiting the DRAIN turn off voltage spike to a safe value,
the RC snubber also reduces radiated video noise by lowering
the dv/dt of the DRAIN waveform, which is critical for video
applications such as TV and VCR. On fixed frequency PWM
and RCC circuits, use of a snubber will result in an undesir-
able fixed AC switching loss that is independent of load. The
ON/OFF control on the TinySwitch eliminates this problem
by scaling the effective switching frequency and therefore,
switching loss linearly with load. Thus the efficiency of the
supply stays relatively constant down to a fraction of a watt of
output loading.
The secondary winding is rectified and filtered by D1 and C4 to
create the 7.5 V output. L1 and C5 provide additional filtering.
The output voltage is determined by the sum of the optocoupler
U2 LED forward drop (~ 1 V) and Zener diode VR1 voltage.
The resistor R2, maintains a bias current through the Zener to
improve its voltage tolerance.
10 W Standby
The TNY255 is ideal for standby applications that require up
to 10 W of power from 230 VAC or 100/115 VAC with doubler
circuit. The TNY255 operates at 130 kHz as opposed to 44 kHz
for TNY253/254. The higher frequency operation allows the
V
DRAIN
V
IN
0.2
Time (ms)
.4
.6
.8
1
0 V
0 V
V
DRAIN
V
IN
12 V
12 V
0
100
Time (ms)
200
300
400
500
0 V
0 V


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