Irs2548d Led Combo Press Final

8/2/2019 Irs2548d Led Combo Press Final

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COMPANY CONFIDENTIAL 11

IRS2548D

LED Driver IC

PFC and Half Bridge driver comboPeter Green LED Group Mgr

Energy Saving Products Business Unit

April 2011


2/13

COMPANY CONFIDENTIAL

LED Lighting Introduction

Small LEDs developed in 1960s for indication

High Brightness / High Power LEDs now available

Lumens per Watt better than Incandescent / Halogenlamps

Lumens per Watt equal or better than Fluorescent orHIDlamps

HB/HP LEDs being adopted in general illumination

Typical applications; bulb replacements, light fixtures,Street lamps

LEDs have longer operating life, typically 50000 hours

LEDs offer better reliability / durability

LEDs are easier to control and dim

LEDs offer reduced Lumen depreciation

(less light output reduction over time)

LEDs are normally DC driven

LEDs are driven by constant current


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High Power LED Applications

LED Street Light

Typically 120W per cobra head

Example opposite uses 4 x 30W

LED panels

One LED driver per cobra head

Typically 1.4A output

Single or multi channel outputOptimize for efficiency (series LED

connection) or redundancy (4 channel

output)

High Lumen output / directed light

Controllable light output (PWM or linear dimming)Galvanically isolated low voltage outputs (safety)

Open and short circuit protected

Wide input voltage range 90 to 305VAC

High power factor and low THD


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COMPANY CONFIDENTIAL 4

Power Factor Control is Power Quality

PFC regulations apply to:

China : China Compulsory Certificate (CCC)

Europe : IEC 1000-3-2

Japan : JIC C 61000-3-2

For products >75W (>26W for lighting applications)

Power Factor

Relationship between voltage and current waveforms

Measure of power quality that affects transmission network efficiency


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IRS2548D

Critical conduction mode (CrCM) PFC Control

THD reduction by on time modulation

Variable frequency oscillator (current controlled)Half bridge driver

PWM dimming input (ENN) also disables PFC

Over current protection (PFC and Half bridge)

Fixed internal 1.6uS half bridge (HO and LO) dead time

Internal bootstrap MOSFET

Internal 15.6V zener clamp diode on VCC

Micropower startup (250uA)

Latch immunity and ESD protection

Maximum half bridge offset voltage 600VGate drive output current (PFC, HO, LO) +/-0.5A

14 lead SOIC package

For LED driver and SMPS applications (typically > 50W)

For wide AC input voltage range 90 to 305 VAC


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IRS2548D Target Applications

OFF LINE LED

LIGHT FIXTURES

Incandescent

Replacement

HID

Replacement

Handheld LEDLamps

AUTOMOTIVE

LCD Back Light

Handheld

Devices

Fluorescent

Replacement


7/13COMPANY CONFIDENTIAL

L

N

E

EMI Filter & Rectifier

Output

IFB

Half-Bridge StagePFC Boost Converter

7

Two Stage LED Driver

IRS2548D

PFC + Half Bridge Driver IC

Combo IC Solution



IRS2548D Typical Schematic

RVBUS 1

RLO

+

RVBUS 2

C1

L

N

RV1F1

CVS

DCP2

DCP1

CCOMP

COCROC

MPFC

CVBUS2

CVBUS1

RPFC

RZX

CVBUS

RVBUS

RFMIN

RVCC

CCS

RCS

RF1

RLM1RLM2

RHOMHS

MLS

CBS

CVCC1CVCC

+

+

BR1

C2

L1

CY

GND

DPFCLPFC

RFMAX

CRES

DOUT1

DOUT2

COUT

RPU

RCL

CVS

Reg+5V

LED+

LED-

RD1

RD2

RD3

RV1

RV2

CF1

CF2

2

ENN

1

2

3

VBUS

4

5

7

FMIN

6

7 8

13

12

11

10

9

14

OC

COMP

ZX

PFC

HO

VS

VB

VCC

COM

LO

CS

IRS254

8D

ROC

PFC MOSFET OPTO ISOLATOR

(Feedback)

Half Bridge MOSFETs

Rectifier

Diodes/MOSFETs

Voltage and

Current

Feedback

Frequency Control Input Bus Voltage Feedback



IRS2548D Demo Board IRPLLED5Features:

High output current regulation90-305VAC universal input

Dimmable with 1-10V DC input

Non-latched shutdown against

output over-voltage

Using IRS2548DSLED control IC



Test Results

Load: 2 x Eco Lumens EPAD connected in series

VACin(Vrms)

Pin

(W)

PF THDi

(%)

Fs

(kHz)

Vout

(Vdc)

Iout

(Adc)

Pout

(W)

Eff

(%)

100 55.1 0.999 2.3 42.8 39.2 1.22 47.8 86.8

120 55.4 0.998 6.4 42.8 39.1 1.23 48.1 86.8

220 55.0 0.979 13.1 42.8 39.1 1.24 48.5 88.2

240 55.1 0.972 15.6 42.8 39.1 1.24 48.5 88.0

277 55.5 0.952 18.3 42.8 39.1 1.25 48.9 88.1

Driving

32 x Samsung Sunnix6HPLED packs

Total Power = 55W



Output V-I Characteristic

Green = LED Voltage

Blue = LED Current

Open circuit voltage < 60V

Current ripple ~15%

Short circuit current = 1.5A

Voltage vs Current

010

20

30

40

50

60

00.2

0.4

0.6

0.8 1

1.2

1.4

1.6

Current (A)

Voltage(V)

V-I



90 to

305VAC50/60Hz

2 Channel

Driver

+48V

0V~ PFC IsolationVoltageControl

Power Converter

EMI filter/

Rectification

2 Channel

Driver

2 Channel

Driver

700mA

700mA

Multi Channel LED Concept

One main power converter supplies

48V isolated DC bus

Wide input voltage range 90 to 305VAC

High power factor and low THD

Output modules provide 2 x 700mA

regulated current outputs

IRS2548D BasedPower Stage



IRS2548D IC Summary

For LED driver and SMPS applications (typically > 50W)

For wide AC input voltage range 90 to 305 VAC

High Power Factor and Low THDResonant Half Bridge Topology / Soft Switching

Efficiency better than 85% above 50W

Efficiency improves at higher power levels

Suitable for isolated LED drivers > 50W

Efficiency and flexibility surpasses Flyback solution above 50W

Protected against short circuit in primary and secondary stages

Enables regulated output current loop for LED driving

Incorporates PWM dimming input, allows dimming to ~2% output

Irs2548d Led Combo Press Final

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