TNY375 Ver la hoja de datos (PDF) - Power Integrations, Inc

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componentes Descripción

Fabricante

TNY375

TinySwitch®-PK Family Energy-Effcient, Off-Line Switcher With Enhanced Peak Power Performance

Power Integrations, Inc 

TNY375-380

Key Application considerations

TinySwitch-PK Design Considerations

Output Power Table

Data sheet maximum output power table (Table 1) represents

the maximum practical continuous output power level that can

be obtained under the following assumed conditions:

1. The minimum DC input voltage is 100 V or higher for 85 VAC

input, or 220 V or higher for 230 VAC input or 115 VAC with

a voltage doubler. The value of the input capacitance should

be sized to meet these criteria for AC input designs.

2. Efficiency of 75%.

3. Minimum data sheet value of I2f.

4. Transformer primary inductance tolerance of ±10%.

5. Reflected output voltage (VOR) of 135 V.

6. Voltage only output of 12 V with an ultrafast PN rectifier

diode

7. Continuous conduction mode operation with transient KP*

value of 0.25.

8. Increased current limit is selected for peak and open frame

power columns and standard current limit for adapter

columns.

9. The part is board mounted with SOURCE pins soldered to a

sufficient area of copper to keep the SOURCE pin

temperature at or below 110 °C.

10. Ambient temperature of 50 °C for open frame designs and

40 °C for sealed adapters.

*KP. Below a value of 1, KP is the ratio of ripple to peak primary

current. A transient KP limit of ≥0.25 is recommended to avoid

premature termination of switching cycles due to initial current

limit (IINIT) being exceeded, which reduces maximum output

power capability.

Peak Output Power Table

230 VAC ± 15%

Product

ILIMIT-

PEAKred

ILIMITPEAK

ILIMIT-

PEAKinc

TNY375PN 8.5 W 14.5 W 16.5 W

TNY376PN 10 W 19 W 22 W

TNY377PN 13 W 23 W 28 W

TNY378PN 16 W 27.5 W 34 W

TNY379PN 18 W 31.5 W 39 W

TNY380PN 20 W 36 W 45 W

85-265 VAC

ILIMIT-

PEAKred

5.5 W

6W

8W

10 W

12 W

14 W

ILIMITPEAK

ILIMIT-

PEAKinc

11.5 W 12.5 W

15 W 17 W

18 W 23 W

21.5 W 27 W

25 W 31 W

28 W 35 W

Table 2. Peak Output Power Capability vs Current Limit Mode Selection.

The values shown in Table 1 for peak power assume operation

in I . LIMITPEAKinc For reference, Table 2 provides peak output

powers for each family member at all three selectable current

limit modes.

For both Table 1 and Table 2, the peak output power values are

limited electronically, based on minimum device I2f. Stated

differently, with sufficient heatsinking, these values could be

delivered indefinitely, but in most cases this would be

impractical. Adapter and open frame power values are

thermally limited and represent the practical continuous (or

average) output power in two common thermal environments.

Over Voltage Protection

The output overvoltage protection provided by TinySwitch-PK

uses an internal latch that is triggered by a threshold current of

approximately 7 mA into the BYPASS pin. In addition to an

internal filter, the BYPASS pin capacitor forms an external filter,

providing noise immunity from inadvertent triggering. For the

bypass capacitor to be effective as a high frequency filter, it

D1

1N4007

F1

L

3.15 A

185-265

VAC

N

D3

1N4007

D2

1N4007

C1

10 MF

400 V

D4

1N4007

C2

22 MF

400 V

R1

1 k7

L1

1 mH

C9

2.2 nF

250 VAC

T1

EFD25

1

9,10

D5

SB560

C3

1000 MF

16 V

VR3

P6KE170A

R9

3.9 M7

C8

10 nF

1 kV

3

R7

22 7

1/2 W

6,7,8

R4

20 7

5

R10

3.9 M7

D7

UF4007

TinySwitch-PK

U1

TNY380P

D

EN/UV

BP

S C6

10 MF

50 V

2

VR2

1N5251B, 22 V

R5

R6 47 7

21 k7 1/8 W

1%

D6

UF4004

C7

1 MF

50 V

U2

PC817A

Figure 15. Single 230 VAC Input 20 W Continuous and 45 W Peak Power Supply Using TNY380P.

C4

1000 MF

16 V

C5

220 MF

16 V

+12 V

L2

3.3 MH

RTN

VR1

BZX55B11

11 V, 2%

R2

390 7

1/8 W

R3

2 k7

1/8 W

PI-4674-051707

www.powerint.com



Rev. A 05/07

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