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TYN256P View Datasheet(PDF) - Power Integrations, Inc

Part Name
Description
Manufacturer
TYN256P
Power-Integrations
Power Integrations, Inc Power-Integrations
TYN256P Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
TNY256
L1
470 µH
D1
D2
1N4005 1N4005
R1
4.7 K
85-265 RF1
VAC 10
Fusible
C1
10 µF
400 V
C2
10 µF
400 V
T1
NC 2
D6
MBR360
1
10
C3
10 nF
R3
C6
330 µF
16 V
C7
330 µF
16 V
330 KD5
4
8
1/4 W
1N4937
TinySwitch Plus
D
EN/UV
U1
R5
TNY256P BP
100
S
U2
SFH615-2
L3
18 µH
C8
220 µF
10 V
+9V
0.6 A
RTN
R9
R7
470 26.1 K
C11
0.1 µF
D3
D4
1N4005 1N4005
C4
0.1 µF
U3
TL431CLP
R8
10 K
C5
2200 pF
Y1 Safety
PI-2502-072699
Figure 12. 5.5 W AC Adaptor with Universal Input (85-265 VAC).
through the TL431 voltage reference for proper regulation.
Capacitor C11 bypasses the TL431 response for improved
ripple performance. Resistor R5 determines the AC gain of the
circuit.
Key Application Considerations
For the most up to date information visit our website
at: www.powerint.com
Design
Output Power
Table 1 shows the practical maximum continuous output power
levels obtainable under following conditions:
1. The minimum DC input voltage is 90 V or higher for 85 VAC
input or 240 V or higher for 230VAC input or 115 VAC
input with a voltage doubler. This corresponds to a filter
capacitor of 3 µF/W for universal input and 1 µF/W for 230
or 115 VAC w/doubler input.
2. A secondary output of 5 V with a Schottky rectifier diode.
3. The P and G packaged parts are board mounted with source
pins soldered to sufficient area of copper and the Y packaged
parts are heat sinked sufficiently to keep the die temperature
at or below 100 oC.
The maximum power capability of TinySwitch in a given
application depends on the thermal environment (sealed
enclosure, ventilated, open frame, etc.,), transformer core size
and design (continuous or discontinuous), efficiency required,
minimum specified input voltage, input storage capacitance,
output voltage, output diode forward drop, etc., and can be
different from the values shown in Table 1.
Audible Noise
At loads other than maximum load, the cycle skipping mode
operation used in TinySwitch can generate audio frequency
components in the transformer. This can cause the transformer
to produce audio noise. Transformer audible noise can be
reduced by using appropriate transformer construction
techniques and decreasing the peak flux density. For more
information on audio suppression techniques, please check the
Application Notes section on our web site at www.powerint.com.
Ceramic capacitors that use dielectrics such as Z5U, when used
in clamp and snubber circuits, can also generate audio noise due
to electrostriction and piezo-electric effects. If this is the case,
replacing them with a capacitor having a different type of
dielectric is the simplest solution. Polyester film capacitors and
ceramic capacitors with dielectrics such as NPO or X7R are
good alternatives.
7 B
8/99
 

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