TOP260YN datasheet(22/50 Pages) POWERINT

22 / 50 page

Rev. M 12/21

TOP252-262

www.power.com

A High Efficiency, 150 W, 250 – 380 VDC Input

Power Supply

The circuit shown in Figure 42 delivers 150 W (19 V @ 7.7 A) at

84% efficiency using a TOP258Y from a 250 VDC to 380 VDC

input. A DC input is shown, as typically at this power level a

power factor correction stage would precede this supply,

providing the DC input. Capacitor C1 provides local decoupling,

necessary when the supply is remote from the main PFC output

capacitor.

The flyback topology is still usable at this power level due to the

high output voltage, keeping the secondary peak currents low

enough so that the output diode and capacitors are reasonably

sized. In this example, the TOP258YN is at the upper limit of its

power capability.

Resistors R3, R6 and R7 provide output power limiting,

maintaining relatively constant overload power with input voltage.

Line sensing is implemented by connecting a 4 M

W resistor from

the V pin to the DC rail. Resistors R4 and R5 together form the

4 M

W line sense resistor. If the DC input rail rises above

450 VDC, then TOPSwitch-HX will stop switching until the

voltage returns to normal, preventing device damage.

Due to the high primary current, a low leakage inductance

transformer is essential. Therefore, a sandwich winding with a

copper foil secondary was used. Even with this technique, the

leakage inductance energy is beyond the power capability of a

simple Zener clamp. Therefore, R1, R2 and C3 are added in

parallel to VR1 and VR3, two series TVS diodes being used to

reduce dissipation. During normal operation, very little power is

dissipated by VR1 and VR3, the leakage energy instead being

dissipated by R1 and R2. However, VR1 and VR3 are essential

to limit the peak drain voltage during start-up and/or overload

conditions to below the 700 V rating of the TOPSwitch-HX

MOSFET. The schematic shows an additional turn-off snubber

circuit consisting of R20, R21, R22, D5 and C18. This reduces

turn-off losses in the TOPSwitch-HX.

The secondary is rectified and smoothed by D2, D3 and C5,

C6, C7 and C8. Two windings are used and rectified with

separate diodes D2 and D3 to limit diode dissipation. Four

capacitors are used to ensure their maximum ripple current

specification is not exceeded. Inductor L1 and capacitors C15

and C16 provide switching noise filtering.

Output voltage is controlled using a TL431 reference IC and

R15, R16 and R17 to form a potential divider to sense the

output voltage. Resistor R12 and R24 together limit the

optocoupler LED current and set overall control loop DC gain.

Control loop compensation is achieved using components C12,

C13, C20 and R13. Diode D6, resistor R23 and capacitor C19

form a soft finish network. This feeds current into the control

pin prior to output regulation, preventing output voltage

overshoot and ensuring startup under low line, full load

conditions.

Sufficient heat sinking is required to keep the TOPSwitch-HX

device below 110 °C when operating under full load, low line

and maximum ambient temperature. Airflow may also be

required if a large heat sink area is not acceptable.

1N4148

C11

100 nF

50 V

+19 V,

7.7 A

RTN

RT1

Ω

R19

4.7

Ω

MBR20100CT

4.7 M

Ω

MBR20100CT

C15-C16

820

µF

25 V

C14

47 pF

1 kV

R20

1.5 k

Ω

2 W

C10

µF

10 V

BYV26C

EI35

13,14

9,10

R15

4.75 k

Ω

C20

1.0

µF

50 V

C17

47 pF

1 kV

µF

50 V

R23

15 k

Ω

0.125 W

R14

Ω

0.5 W

8.06 k

Ω

2.2 nF

250 VAC

R10

6.8

Ω

4.7 nF

1 kV

µF

400 V

R22

1.5 k

Ω

2 W

1N4148

4.7

68 k

Ω

2 W

4 A

C18

120 pF

1 kV

R16

31.6 k

Ω

68 k

Ω

2 W

VR2

1N5258B

36 V

R11

1 k

Ω

0.125 W

C19

µF

50 V

R12

240

Ω

0.125 W

TOP258YN

R24

Ω

0.125 W

C5-C8

25 V

VR1, VR3

P6KE100A

R18

Ω

0.5 W

R21

2 W

1N4937

PC817A

TL431

C12

4.7 nF

50 V

R17

562

Ω

R13

56 k

Ω

0.125 W

C13

100 nF

50 V

Ω

PC817B

3.3

µH

2.0 M

Ω

2.0

ΜΩ

1.5 k

Ω

TOPSwitch-HX

4.7 M

Ω

820

µF

250 - 380

VDC

PI-4795-092007

CONTROL

Figure 42. 150 W, 19 V Power Supply using TOP258YN.

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