Datasheet > DI-67

DI-67

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		驱动器功率因数校正
页数	文件大小	规格书
2页	74K
描述
Isolated, Power Factor Corrected (PFC), 17 W LED Driver

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DI-67 数据手册

Design Idea DI-67

TOPSwitch^®-GX Isolated, Power

Factor Corrected (PFC), 17 W LED Driver

Topology

Device

Output Current

Application

Input Voltage

Power Output

Flyback

LED Arrays

17.6 W max

108-132 VAC 60 Hz

TOP246F

700 mA (16-24 V)

The DC input capacitor (C3, 100 nF) was sized so that its

voltage approaches zero at the AC input zero crossings (see the

middle waveform of Figure 2).

Design Highlights

• 700 mA of output current regulated to within ± 5%

• Power factor: > 0.98, THD: ≤ 9.6%

• No output current overshoot at power-on

• Temperature range: -40 °C to +80 °C

• Harmonics comply with IEC61000-3-2, Edition 2.1

• Conducted EMI complies with CISPR-22 B

A 220 µF capacitor (C6) was chosen for the bias supply to

minimizethe120Hzripplecurrentintothecurrentsource(Q1),

which provides control current to U1. The output rectifier (D9)

mustberatedforanaverageof3.5A. CapacitorC7’svalue(680

µF) sets the magnitude of the output ripple current to 600 mA

peak to peak, at 120 Hz.

Operation

This low-cost, TOP246F based PFC LED Driver takes

advantage of built-in TOPSwitch-GX features. This supply is

current (not voltage) regulated, except in the case of no-load.

Without a load, the output voltage is limited to about 30 V

(max), byR6andVR2. Configuredasaflybackconverter, this

circuit operates in the discontinuous conduction mode. It can

deliver an average of 700 mA (1 A at the peak of output ripple)

overa16Vto24Vrange,whichmakesitidealfordrivinghigh

current LED arrays, such as the Luxeon 12 UP LED Ring.

Resistors R7, R8, R9 and U2’s LED set the 700 mA average

current limit. The U2 phototransistor drives the current source

(Q1) and the PFC-loop filter capacitor (C8, 100 µF). Capacitor

C8 was sized to provide the low loop bandwidth necessary for

high power-factor. R4 is the power-off discharge path for C6

and C8.

The CONTROL pin bypass capacitor (C5, 1 µF) is just large

enough to allow smooth start-up of the output load current, and

yet small enough to prevent output current overshoot. A larger

value of C5 would increase start-up delay time.

2.2 nF

Y CAP

700 mA

16-24 V

D1-D4

IN4004

VR1

P6KE200A

150 uH

BYV28-200

680 uF

35 V

100 Ω

100 nF

UF4002

UF4005

100 nF

X2 CAP

10 kΩ

499 Ω

1.00 kΩ

220 uF

25 V

27 mH

VR2

PN2907A

1N5254B

UF4005

100 nF

X2 CAP

TOPSwitch-GX

TOP246F

3.01 kΩ

RV1

150 V

1N4148

CONTROL

100 Ω

F1 T1A

250 V

100 uF

25 V

10.0 kΩ

R8 1.50 Ω, 1%

R9 10.0 Ω, 1%

1.0 uF

108-132 VAC

60 Hz

RETURN

PC81711NSZ

Figure 1. Isolated Constant Current PFC LED Driver.

PI-3746-110303

October 2003

DI-67

www.powerint.com

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