ADTech ADT6031 Led controller with active pfc Datasheet

Primary Side Regulation for
LED Controller with Active PFC
ADT6031
GENERAL DESCRIPTION
The ADT6031 is a high accuracy constant current mode primary side regulation controller for
dimmable LED lighting system. The control signal comes from primary side without optical
coupler to simplify application design and cost. The controller operates in BCM (Boundary
conduction mode) and in a quasi-resonant mode to provides high efficiency and to ease system
EMI design. The device has robust protection function such as LED open/short protection, over
voltage protection, over temperature protection and Under voltage lock-out. The ADT6031 is
available in SOP8 Package.
FEATURES
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APPLICATIONS
Operating range up to 30V
PF ≥ 0.9
LED Current accuracy ≤ ±5%
20µA Start-Up current
Over voltage / LED open protection
Over temperature protection
Secondary catch diode open/short protection
0V~10V Dimming / PWM dimming input
Line feed-forward for accuracy regulation
5V LDO Output (≤ 10mA)
SOP8 package
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Dimmable LED lighting
LED Bulb, PAR, TUBE
LED Down light, Flood-light
External LED driving module
TYPICAL APPLICATION CIRCUIT
Figure 1. Typical Application Circuit
* This specifications are subject to be changed without notice
Jan 29. 2014 / Preliminary
1/7
http://www.ad-tech.co.kr
PSR LED Driver
ADT6031
PIN CONFIGURATION
1
DIM
2
MULT
3
CS
4
ADT6031
VREG5
8
VCC
7
GD
6
GND
5
ZCD
Pin No.
Pin Name
Description
1
VREG5
5V power supply output. A capacitor (typical 1µF) should be connected to GND.
2
DIM
3
MULT
0V~10V Dimming / PWM Dimming input
Main input of the multiplier. Connected to the rectified main voltage via a resistor
divider and provides the sinusoidal reference to the current loop.
4
CS
Current sense input and one input of internal PWM comparator.
5
ZCD
Zero Current Detection input. A negative edge triggers MOSFET’ turn on.
6
GND
Ground.
7
GD
8
VCC
Gate driver output.
Supply voltage input.
SIMPLIFIED BLOCK DIAGRAM
* This specifications are subject to be changed without notice
May 26. 2014 / Preliminary
2/7
http://www.ad-tech.co.kr
PSR LED Driver
ADT6031
ABSOLUTE MAXIMUM RATINGS (Note1)
PARAMETER
SYMBOL
RATING
UNIT
Ground Voltage
GND
-0.3
V
Power Voltage
VCC
-0.3 ~ 40
V
Gate Driver Output
OUT
-0.3 ~18
V
ZCD
ZCD
-0.7 ~ 6
V
VREG5,DIM,MULT,CS
-0.3 ~ 6
V
Power Dissipation(Note2)
PD
-
W
Junction Temperature
TJ
-40 ~ 150
℃
Storage Temperature
TSTG
-65 ~ 150
℃
θJA
150
℃/W
All other pins
Thermal Resistance (Note3)
Note1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
Note2. Junction to ambient temperature is highly dependent upon the application and board layout .
The maximum allowable power dissipation can be calculated by P D (Max) = (TJ(Max) – TA)/θJA.
If exceeding the maximum allowable power dissipation, the device goes to the shutdown conditions by over
temperature protection.
Note3. Measured on JESD51-7, 4-layer PCB
Recommended Operating Conditions (Note4)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power supply voltage
VCC
-
20
-
V
Operating temperature
TOPR
-40
-
+85
℃
TJ
-40
-
+125
℃
Junction temperature
Note4. The device is not guaranteed to function outside of its operating conditions
* This specifications are subject to be changed without notice
May 26. 2014 / Preliminary
3/7
http://www.ad-tech.co.kr
PSR LED Driver
ADT6031
ELECTRICAL CHARACTERISTICS
(VCC = 20V, Ta=25°C , unless otherwise specified)
Parameter
Conditions
Symbol
Min.
Typ.
Max.
Units
VCC
-
20
-
V
Supply Voltage
Operating Range
Turn-On Threshold
UVLO Enable
VCC-ON
16
V
Turn-Off Threshold
UVLO Disable
VCC-OFF
10
V
VCC-HYS
6
V
VCC-CLAMP
35
V
ISTART
20
µA
Quiescent Current
IQ
2.5
Operating Current
ICC
Hysteretic Voltage
Clamp Voltage
Supply Current
Start Up Current
mA
5
mA
Current Sensing
Start Up Time
TSTART
100
µsec
Max On time
TMAX
50
µsec
Min off time
TMIN1
3.5
µsec
Min off time (Protection)
TMIN2
170
µsec
Propagation delay
ZCD to GD
Leding Edge Banking Time
TPD
50
nsec
TLEB
300
nsec
Gate Driver
Rising Time
CL=1nF
TR
150
nsec
Falling Time
CL=1nF
TF
60
nsec
Output Clamp Voltage
VCC =28V
VGD-CLAMP
Max Source Current
Max Sink Current
12
V
ISOURCE
50
mA
ISINK
50
mA
VZCD_EN
0.3
V
Zero Cross Detection (ZCD)
Enable Voltage
Disable Voltage
VZCD_DIS
1
V
Hysteretic Voltage
VZCD--HYS
700
mV
TQUASI
200
nsec
VOCP
1.5
V
VOVP_VCC
30
V
VOVP_ZCD
4
V
TOTP
150
°C
VLDO
5
V
Quasi-Resonant Delay Time
Protection
Over Current Protection
Over Voltage Protection (VCC)
Over Voltage Protection
(Secondary Side)
Over Temperature Protection
LDO
Output Voltage
C=1uF,Iload=1mA
DIMMING
0V~10V Dimming
-
VLDO
10
100
%
PWM Dimming
-
VLDO
10
100
KHz
* This specifications are subject to be changed without notice
May 26. 2014 / Preliminary
4/7
http://www.ad-tech.co.kr
PSR LED Driver
ADT6031
Functional Description
General Operations
The ADT6031 is a primary side offline LED driver with inherent Power Factor
Correction(PFC). The LED current can be well controlled by the primary current sensing
technology without secondary current sensing using opto-coupler. It provides cycle by cycle
over current protection, VCC (Chip power supply) over voltage protection, LED over voltage
protection and over temperature protection. In order to decrease EMI, the ADT6031 has
Quasi-Resonant turn-on MOSFET technique.
Startup and UVLO
The VCC voltage is charged through sensing resistor from the AC line.
The startup current of ADT6031 is approximately 20uA until VCC voltage is less than UVLO
disable voltage ( Typical 16V). The startup time can be designed by the selection of sensing
resistor and half wave rectifier which is connected to auxiliary transformer to make VCC
voltage. When VCC voltage exceeds the UVLO disable level, the VCC is taken over by the
auxiliary winding.
<Fig.1 Operation of Startup and UVLO>
slope 
I RS  I CS
CVCC
<Fig.2 Waveform of startup and UVLO>
* This specifications are subject to be changed without notice
May 26. 2014 / Preliminary
5/7
http://www.ad-tech.co.kr
PSR LED Driver
ADT6031
Constant-Current Regulation
In order to drive LED load, the constant-current mode is better choice to decrease LED
brightness variation. The ADT6031 estimates the LED current at the primary side by ADTech
constant current estimation method called TrueCurrent-I.
※ TrueCurrent-I will be described end of this document.
Zero Crossing Detection (Quasi –Resonant)
The hard switching technique is notorious for EMI source in the SMPS applications.
The ADT6031 provides Quasi-Resonant switching by zero crossing detection block(ZCD).
* This specifications are subject to be changed without notice
May 26. 2014 / Preliminary
6/7
http://www.ad-tech.co.kr
PSR LED Driver
ADT6031
PACKAGE DIMENSTION
SOP-8
* This specifications are subject to be changed without notice
May 26. 2014 / Preliminary
7/7
http://www.ad-tech.co.kr
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