long life, high pf for led with st solutionsu.dianyuan.com/bbs/u/71/1445891226979666.pdf · 2020....

STMicroelectronicsI&PC Div. – Off-line SMPS Appl. Group Oct. 2008

Sam GuoSam GuoOffOff--line Appl. Engineerline Appl. Engineer

Industrial & Power Conversion DivisionIndustrial & Power Conversion DivisionAPMAPM--Great China Great China

Long Life, Long Life, HighHigh PF for LED Driver PF for LED Driver with ST solutionswith ST solutions

I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group

Presentation outline

1. LED Drivers with DC-DC converters① LED7706, LED7707② L6920D/DB

2. LED Drivers with AC-DC converters① Viper Families: Power smaller than 10W② L6562A: Power larger than 10W


LED Drivers Questions

Energy saving

?

Life-time?

Safety?


LED Drivers What Regulation says…..Solutions seen in the former pages are cheap, small, simple but not compliant with Regulations and not addressing the requirements coming from the market.Lighting Power Supplies > 25W must have PFC but also for very low power marketrequires solution with PFC to solve the problems related to harmonic distortion in multi power systems.

ENERGY STAR Program Requirements for Solid State Lighting Luminaries, Version 1.0, says that Power Supplies must have PF > 0.7 and > 0.9 respectively for Residentialand Commercial.

Furthermore, in order to avoid that Power Supply affect one of the main advantage of LEDs, the lifetime and MTBF, it is strongly recommended NOT using electrolyticcapacitors, especially that ones placed at the Power Supply input which have to be capable of withstanding high voltage stress.

How to do …… ?


LED Drivers with DC-DC converters

LED7706/7 family - Boost

LED7707LED7707

LED7706LED7706

BOOSTQFN4x4 24LQFN4x4 24L

2A (switch) up to 30mA for each row

up to 1MHz

VIN from 4.5V to 36V

2A (switch) up to 85mA for each row

up to 1MHz

QFN4x4 24LQFN4x4 24L


LED Drivers with DC-DC convertersLED7706/7 family - Boost

VIN= 4.5V to 36V VOUT= up to 36V

PWM Dimming

High efficiency

Input voltage: 4.5V to 36V LED current: up to 85mA/ch (LED7707)

RILIM

RLED R

KI =

Channel to channel current mismatch: ±±±±2%Up to 20kHz PWM dimming (1%-100%, LED7706)

14V 24V

95%

90%

(LED7707@VOUT=36V, IOUT=350mA)

INPUT VOLTAGE

η

Wide input voltage range

Parallelable channels for higher current (LED7707)

+5V

LED770x

VREF

OVPLDO

CTRLLOGIC

CURR.GEN.

Enable

Fault

RRILIM

Up to 10 white LEDs

per row

Maximum RMS switch current: 2.5A


LED Drivers with DC-DC convertersL6920D/DB - Boost

#LED limited by:VOUT,MAX = 5.2V => 1 wLED

ISW,MAX = 0.8A =>

LED Accuracy: ±5.24% with VSENSE=238mV(LM351 VOS=±5mV)

DA is the actual duty cycles considering power losses

+⋅=

21

1

RR

R

R

VI

S

FBLED

( ) MAXSWAMAXLED IDI ,, 1 ⋅−=

STEVAL-ILL008V1

400mA200mA1 wLED

(VF=3.5V)

Vin=2.4VVin=1.2VMax ILED

+

-+

C30.1uF

Rs0.33

R2 30k

R351k

FB

L6920D

8

3

7

2

4

5

6

1

OUT

LBO

GND

LX

SHDN

LBI

REF

Cout

47uF

6.3V

Cin

47uF

6.3V

+BT3V

L 10uH

C40.1uF

R11k

C2 1nF

SW

MSOP8 (L6920DB)MSOP8 (L6920DB)MSOP8 (L6920DB)MSOP8 (L6920DB)MSOP8 (L6920DB)MSOP8 (L6920DB)MSOP8 (L6920DB)MSOP8 (L6920DB) TSSOP8 (L6920D)TSSOP8 (L6920D)TSSOP8 (L6920D)TSSOP8 (L6920D)TSSOP8 (L6920D)TSSOP8 (L6920D)TSSOP8 (L6920D)TSSOP8 (L6920D)


LED Drivers with AC-DC converters

Viper families – High PF Flyback

GND / SOURCE DRAIN

FB

DRAIN

CONT

VDD

BR

VIPER17/27

+ Technology+ Functionalities+ Protections


BCD6 controller technology

NEW

NEW

CONT

VDD

FB

Out

CONTROL

On-Off

Gate

Sense

Tmp1

Gnd

SOURCE

Out

GndGnd1

Sense

Gate

On/Off

Tmp1

DRAIN

BR

800V Avalanche Ruggedness Power MOSFET in SuperMESH Technology



+T

echnology




+ Functionalities

� Current mode converter with ADJUSTABLE IDLIM set point� Fixed frequency (60kHz or 115kHz) with JITTERING for EMI reduction� SOFT START UP: IDLIM increased cycle by cycle� BURST MODE in low load condition with IDLIMfixed up to 100 mA� STAND BY consumption < 40 mW




+ Protections

� Over voltage protection (OVP)� 2nd over current protection (2nd OCP)� Over load protection (OLP)� Over temperature protection + hysteresis (OTP)� Brown out protection� Max Duty Cycle: 70%

AUTO RESTART

MODE

after every fault

condition




.

R9

22k

FB

DR

AIN

GN

D

DR

AIN

VDD

CONT

BR

VIPer17

VoutD4FUSE

E

C D3

OPTO

D5

OPTO

R11

R4

22

C60

(10uF)

D3

- +D0

BRIDGE

1

4

3

2

C1

(100nF X2)

RH

R1330k

R10

(2.7k)

C4

1.5nF 250V

C7

220nF

C2

(10nF)

C3

(100uF)

C50(2.2nF Y1)

C9

330nF

T1

1

34

12

10

66

RL

L1

C6

100uF

AC IN

180Vac-265Vac

R130

C20

(1uF)

D1

R2100

C10

10nF

R8

4.7k

Cout

R7

22k

Dout13.5V 350mA

R6

(2k)

Vs

Vct

rl

Ictrl

GND

OUT

Vcc

TSM1052Dout23.5V 350mA

R12

1.8k

C5

2.2nF

Schem

atic

Viper17+TSM1052




Vin=230Vac

PF = 0.917 Pin = 4.24W


LED Drivers with AC-DC convertersNew VIPer Plus Product Portfolio

FIXED FREQUENCY QUASI RESONANT

Pow

er

30W

0W

GND DRAIN

FB

DRAIN

CONT

VDD

BR

VIPer37

GND DRAIN

FB

DRAIN

CONT

VDD

BR

VIPer27

MAT20

GND DRAIN

FB

DRAIN

CONT

VDD

BR

VIPer17

MAT30

GND DRAIN

FB

DRAIN

CONT

VDD

EPT

VIPer28

MAT29

GND DRAIN

FB

DRAIN

ZCD

VDD

BR

VIPer15

MAT20

GND DRAIN

FB

DRAIN

ZCD

VDD

BR

VIPer35

GND DRAIN

FB

DRAIN

ZCD

VDD

BR

VIPer25

MAT20

GND DRAIN

FB

DRAIN

LIM

VDD

COMP

VIPer16

�Peak power

capability

�Self supply without

auxiliary winding

�Buck and buck-

boost converters

1ΩΩΩΩ

20ΩΩΩΩ

ON

-Resistance

�Brown out protection �Zero Current Detection

�Brown out protection




VIPer16VIPer16

VIPer17VIPer17

VIPer27VIPer27

VIPer28VIPer28

VIPer15VIPer15

VIPer12AVIPer12A

VIPer22AVIPer22A

VIPer20AVIPer20A

VIPer16VIPer16

VIPer17VIPer17

VIPer15VIPer15

VIPer27VIPer27

VIPer28VIPer28

VIPer12AVIPer12A

VIPer22AVIPer22A

VIPer20AVIPer20A

VIPer53xVIPer53x

VIPer50AVIPer50A

VIPer100AVIPer100A

VIPer16VIPer16

VIPer17VIPer17

VIPer15VIPer15

VIPer27VIPer27

VIPer28VIPer28

VIPer12AVIPer12A

VIPer22AVIPer22A

VIPer16VIPer16

VIPer17VIPer17

VIPer15VIPer15

VIPer12AVIPer12A

VIPer22AVIPer22A

VIPer16VIPer16

VIPer17VIPer17

VIPer27VIPer27

VIPer28VIPer28

VIPer15VIPer15

VIPer12AVIPer12A

VIPer22AVIPer22A

22--10W10W

Home appliances

55--40W40W

Consumer equipments

44--8W8W

Metering equipments

44--6W6WBattery Charger

22--8 Leds8 LedsLighting

VIP

er TM

Market M

atrix


LED Drivers with AC-DC convertersL6562A – High PF Flyback

VREF2

OVERVOLTAGEDETECTION

VOLTAGEREGULATOR

UVLO

INTERNALSUPPLY BUS

+

-

2.5V

-

+

R

S

Q

+-

DRIVER

STARTER+

-

ZERO CURRENT

DETECTOR1.4 V0.7 V

VCC

8

1 2 3 4

ZCD

VCC

INV COMP MULT CS

GD7

5

GND6

25 V

14 V

Starters top

LEADING-EDGEBLANKING

DIS

LOWER & UPPERCLAMPS

DIS -

+ 0.3 V0.2 V

DYNOVP

STATOVP

MULTIPLIER ANDTHD OPTIMIZER

• Transition Mode PFC Controller•

• Ultra Low Start-up Current (



Schem

atic



Vin=230Vac

Ch1 = VoutCh4 = Iout

L6562A – High PF Flyback

Pin = 90WPout = CV 30V

PF > 0.95



L6562A P

FC

Fly back S

umm

aryL6562A

PF

C F

ly back Sum

mary

1. It is the only low cost solution to obtain single stage insulated PFC

2. Doesn’t need input electrolytic capacitors 3. The Quasi-resonant topology reduces the capacitiv e

switching losses4. The frequency jitter due the input voltage ripple helps the

system to pass the EMC tests.5. The L6562A current sense stage achieves High freq uency

operation.6. Quasi-resonant operation prevents transformer sat uration

problems (potentially occurring with CCM topology )7. Easy short circuit protection8. Compliant with the European regulation EN61000-3- 2

Class-C and Japanese regulation JEIDA-MITI Class-C.


LED Drivers AnswersEnergy Saving

Life-time Safety

Solutions:Solutions:

DCDC--DC: LED7706/LED7707; L6920D/DBDC: LED7706/LED7707; L6920D/DB

ACAC--DC: Viper Families; L6562/ADC: Viper Families; L6562/A

High EfficiencyHigh Efficiency

High PFHigh PF

DimmableDimmable

PFC and converter PFC and converter

combinedcombined

Low CostingLow Costing

>100K Hours >100K Hours –– YES:YES:

No Input ENo Input E--cap, cap,

Output EOutput E--cap can be cap can be

disable disable

Low input voltage can Low input voltage can

be: 3be: 3-- 4.5V for DC4.5V for DC--DCDC

Safety isolated for ACSafety isolated for AC--

DCDC

Protections are Protections are

availableavailable

Max output voltage, Max output voltage,

output current limitedoutput current limited


- Q & A -

THANK YOU!

E-mails:Marketing: [email protected] : [email protected]

long life, high pf for led with st solutionsu.dianyuan.com/bbs/u/71/1445891226979666.pdf · 2020....

Documents