TNY253(2001) データシートの表示（PDF） - Power Integrations, Inc
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TNY253 Datasheet PDF : 20 Pages
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TNY253/254/255
D1
D2
1N4005 1N4005
R2
100 kΩ
1W
85-265
VAC RF1
10 Ω
C1
C2
6.8 µF 4.7 µF
400 V 400 V
Fusible
D3
D4
1N4005 1N4005
R1
1.2 kΩ
D5
T1 FR201
1
10
C4
2200 pF
2
5
D6
1N4937
TinySwitch
D
EN
U1
TNY254P
BP
U2
LTV817
S
C5
220 µF
25 V
R7
100 Ω
C3
0.1 µF
R9
47 Ω R3
Q1
22 Ω
2N3904
R5
18 Ω
1/8 W
L2
3.3 µH
C6
220 µF
16 V
R8
820 Ω
VR1
1N5230B
4.7 V
L1
560 µH
C8
2.2 nF
Y1 Safety
R4 R6
1 Ω 0.82 Ω
1 W 1/2 W
Figure 11. 3.6 W Constant Voltage-Constant Current Cellular Phone Charger Circuit.
+ 5.2 V
RTN
PI-2244-082898
D1
1N4004
115 VAC
± 15%
C1
2.2 µF
200 V
RF1
D2
1.8 Ω 1N4004
Fusible
C2
2.2 µF
200 V
C4
68 pF
1 KV
R2
100 Ω
D3
T1 1N3934
1
10
C6
100 µF
16V
5
6
TinySwitch
D
U1
EN
TNY253P BP
S
C3
0.1 µF
C5
2.2 nF
Y1 Safety
Figure 12. 0.5 W Open Loop AC Adapter Circuit.
VR1
1N5239B
+9V
RTN
PI-2190-031501
constant voltage and constant current output. TinySwitch is
always powered from the input high voltage, therefore it does
not require bias winding for power. Consequently, its operation
is not dependent on the level of the output voltage. This allows
for constant current charger designs that work down to zero
volts on the output.
Figure11 shows a 5.2V, 3.6W cellular phone charger circuit
that uses the TNY254 and provides constant voltage and constant
current output over an universal input (85 to 265VAC) range.
The AC input is rectified and filtered by D1 - D4, C1 and C2 to
create a high voltage DC bus connected to T1 in series with the
high voltage MOSFET inside the TNY254. The inductor L1
forms a π-filter in conjunction with C1 and C2. The resistor R1
damps resonances in the inductor L1. The low frequency of
operation of TNY254 (44kHz) allows use of the simple π-filter
described above in combination with a single Y1-capacitor C8
to meet worldwide conducted EMI standards. The diode D6,
capacitor C4 and resistor R2 comprise the clamp circuit that
limits the turn-off voltage spike on the TinySwitch DRAIN pin
to a safe value. The secondary winding is rectified and filtered
by D5 and C5 to provide the 5.2V output. Additional filtering
7 C
7/01
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