Upload
others
View
4
Download
0
Embed Size (px)
Citation preview
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers Questions
Energy saving
?
Life-time?
Safety?
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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 …… ?
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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)
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Viper families – High PF Flyback
GND / SOURCE DRAIN
FB
DRAIN
CONT
VDD
BR
VIPER17/27
+ Technology+ Functionalities+ Protections
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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
LED Drivers with AC-DC converters
Viper families – High PF Flyback
+T
echnology
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Viper families – High PF Flyback
+ 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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Viper families – High PF Flyback
+ 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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Viper families – High PF Flyback
.
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Viper families – High PF Flyback
Vin=230Vac
PF = 0.917 Pin = 4.24W
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Viper families – High PF Flyback
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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 (
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC convertersL6562A – High PF Flyback
Schem
atic
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC converters
Vin=230Vac
Ch1 = VoutCh4 = Iout
L6562A – High PF Flyback
Pin = 90WPout = CV 30V
PF > 0.95
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
LED Drivers with AC-DC convertersL6562A – High PF Flyback
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.
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
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
I&PC Div. – Off-line SMPS Appl. Group Oct. 2008I&PC Div. – Off-line SMPS Appl. Group
- Q & A -
THANK YOU!
E-mails:Marketing: [email protected] : [email protected]