TOP244YN- datasheet(20/52 Pages) POWERINT

Part #	TOP244YN-

Description	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher

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Manufacturer	POWERINT [Power Integrations, Inc.]

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TOP242-250

M

12/04

20

Figure 41. 30 W Power Supply using External Current Limit Programming and Line Sensing for UV and OV.

12 V @

2.5 A

D2

1N4148

T1

C5

47

µF

10 V

U2

LTV817A

VR2

1N5240C

10 V, 2%

R6

150

Ω

R15

150

Ω

C14

1 nF

D1

UF4005

R3

68 k

Ω

2 W

C3

4.7 nF

1 kV

CY1

2.2 nF

U1

TOP244Y

D

L

S

X

F

C

R8

150

Ω

C1

68

µF

400 V

C6

0.1

µF

D8

MBR1060

C10

560

µF

35 V

C12

220

µF

35 V

C11

560

µF

35 V

RTN

R5

6.8

Ω

R1

4.7 M

Ω

1/2 W

R4

2 M

Ω

1/2 W

R2

9.09 k

Ω

PI-2657-081204

L3

3.3

µH

BR1

600 V

2A

F1

3.15 A

J1

L1

20 mH

L

N

CX1

100 nF

250 VAC

CONTROL

TOPSwitch-GX

PERFORMANCE SUMMARY

Output Power:

30 W

Regulation:

± 4%

Efficiency:

≥ 79%

Ripple:

≤ 50 mV pk-pk

Application Examples

A High Efﬁciency, 30 W, Universal Input Power Supply

The circuit shown in Figure 41 takes advantage of several of

the TOPSwitch-GX features to reduce system cost and power

supply size and to improve efﬁciency. This design delivers

30 W at 12 V, from an 85 VAC to 265 VAC input, at an ambient

of 50 °C, in an open frame conﬁguration. Anominal efﬁciency

of 80% at full load is achieved using TOP244Y.

The current limit is externally set by resistors R1 and R2 to a

value just above the low line operating peak DRAIN current

of approximately 70% of the default current limit. This

allows use of a smaller transformer core size and/or higher

transformer primary inductance for a given output power,

reducing TOPSwitch-GX power dissipation, while at the same

time avoiding transformer core saturation during startup and

output transient conditions. The resistors R1 & R2 provide a

signalthatreducesthecurrentlimitwithincreasinglinevoltage,

which in turn limits the maximum overload power at high input

line voltage. This function in combination with the built-in

soft-startfeatureofTOPSwitch-GX,allowstheuseofalowcost

RCD clamp (R3, C3 and D1) with a higher reﬂected voltage,

by safely limiting the TOPSwitch-GX drain voltage, with

adequate margin under worst case conditions. Resistor R4

provides line sensing, setting UV at 100 VDC and OV at

450 VDC. The extended maximum duty cycle feature of

TOPSwitch-GX

(guaranteed minimum value of 75% vs. 64%

for TOPSwitch-II) allows the use of a smaller input capacitor

(C1). The extended maximum duty cycle and the higher

reﬂected voltage possible with the RCD clamp also permit

the use of a higher primary to secondary turns ratio for T1,

which reduces the peak reverse voltage experienced by the

secondary rectiﬁer D8. As a result a 60 V Schottky rectiﬁer

can be used for up to 15 V outputs, which greatly improves

power supply efﬁciency.The frequency reduction feature of the

TOPSwitch-GX

eliminates the need for any dummy loading

for regulation at no load and reduces the no-load/standby

consumption of the power supply. Frequency jitter provides

improved margin for conducted EMI, meeting the CISPR 22

(FCC B) speciﬁcation.

Output regulation is achieved by using a simple Zener sense

circuit for low cost. The output voltage is determined by the

Zener diode (VR2) voltage and the voltage drops across the

optocoupler (U2) LED and resistor R6. Resistor R8 provides

bias current to Zener VR2 for typical regulation of ±5% at

the 12 V output level, over line and load and component

variations.

AHigh Efﬁciency, Enclosed, 70 W, UniversalAdapter Supply

The circuit shown in Figure 42 takes advantage of several of the

TOPSwitch-GX

features to reduce cost, power supply size and

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