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VAS1106A
TRIAC Dimmable Offline LED Driver
General Description
The VAS1106A is a constant current driver
designed to be compatible with TRIAC
dimmers. A string of series/parallel LEDs is
tapped at the Drain of integrated high voltage
switch. The LED current is programmable and
kept constant by a current source.
The VAS1106A includes a bleeder circuit to
ensure proper TRIAC operation by allowing
current flow while the line voltage is low to
enable proper firing of the dimmer.
The device has an input voltage detecting
circuit improves PSRR performance when AC
line voltage varies.
VAS1106A is available in a SOP8-e
package.
Parallel for High Power
Output current
±5%
accuracy
Temperature Compensation
Low conducted EMI without filters
SOP8-e package
Ordering Information
Order Number
VAS1106AID08E
I: Industry, -40~85°
C
08: Pin Number
Package Type Temp. Range
SOP8-e
-40 ° to 85°
C
C
D: SOP
E: ROHS
Pin Configuration
SOP8-e
Application
• LED Lighting
GND
SET1
SET2
1
2
Thermal PAD
3
4
8
7
6
5
T1
NC
NC
T2
Features
Fit TRIAC Dimming
Flicker-less Application
SNS
Typical Application Circuit
D1
AC
C2
T1
T2
SET2
VAS1106A
SNS
SET1
VSS
R
SET1
R
SET2
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VAS1106A
Block Diagram
T1
T2
0.65V
HV LDO
5V
Reference
SET2
Bleeder
psrr
OTP
SET1
SNS
GND
PIN Description
PIN NO.
1
2
Name
GND
SET1
Ground
Provide a bleeder current to ensure proper firing of the triac
dimmer.
I
Bleeder
½
V
SET
1
, V
SET1
=500mV.
R
SET
1
R
SET
2
V
SET
2
, V
SET2
=650mV.
R
SET
2
Description
Current set for current regulator, connect a resistor to GND to
set the LED current.
I
LED
½
3
SET2
If the IC temperature rise up to 135° the SET2 voltage will
C,
drop to reduce current.
The SET2 voltage will drop down to 200mV
The input voltage sense pin
Current regulator outputs. Connect to taps along the LED string
No Connection
Connect to power line
Thermal PAD must connect to Ground
4
5
6
7
8
EP
SNS
T2
NC
NC
T1
GND
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VAS1106A
Maximum Ratings
-0.3V to 500V
-0.3V to 8V
-40° to +85°
C
C
-40° to +150°
C
C
-65° to +150°
C
C
2000V
Absolute Maximum Ratings
(Note1)
Parameters
T1~T2 to GND
SET1,SET2,SNS to GND
Operating temperature range
Junction temperature
Storage temperature range
ESD human body model
Note1: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only and functional operation of the device at these or any other condition beyond
those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(Note2)
SPEC
Symbol
VSUP
ICC
V
SET1
V
SET2
I
ACCU
T
SD
R
ƟJA
Parameter
Input voltage range
Quiescent current
SET1 pin voltage
SET2 pin voltage
Current accuracy
OTP threshold
Thermal resistance
SOP8-e
VT1=310V
0.627
VT1=310V
160
0.5
0.65
±
5
160
60
0.683
Condition
Min.
Typ.
Max.
500
300
Unit
V
μA
V
V
%
°
C
°
C/W
Note 2: Production testing of the device is performed at 25° Functional operation of the device and parameters
C.
specified over other temperature range, are guaranteed by design, characterization and process control.
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VAS1106A
Application Information
1. Set LED Current
The VAS1106A feature a programmable LED current using a resistor R
SET2
. Use the following
equation to calculate the sense resistor:
I
LED
½
0.65
V
R
SET
2
Change the value of R
SET
can obtain the required constant current. The chip power consumption is
I
LED
*
V
D
, V
D
is LED cathode voltage. In order to get the higher accuracy of the LED output
current ,an 1% or more high precision and low temperature coefficient resistor is commented.
2. Set Bleeding Current
Bleeder current is to ensure the proper firing of TRIAC dimmer.
Resistors R
SET1
and R
SET2
are used to set
bleeding current by:
I
Bleeder
½
0.5
V
R
SET
1
R
SET
2
Vin/Input
120V/4W
230V/4.5W
R
SET1
18Ω
51Ω
R
SET2
10Ω
18Ω
Typically values of R
SET1
& R
SET2
are as follows：
3. Over-Heating Issue
The VAS1106A provide thermal protection features. It ruduces the output current when the die
temperature rised over 135° and shuts down the operating when the temperature is over 160°
C
C.
Once the temperature dropped to 130° VAS1106A re-start to work again.
C,
4. Line Regulation Improving Feature
As the line voltage varies, the LED turn on time changes thus affects the system’s input power.
The VAS1106A has the feature to sense the line voltage by SNS PIN and provide feedback to
compensate the power.
D1
AC
LED
R3
T1
T2
SET2
SNS
C2
VAS1106A
SET1
R
SET1
R4
C1
VSS
R
SET2
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VAS1106A
In typical case for a 25% increase on the line voltage of 120V system, this feature provides a
compensation that the input power only changes 8%. And less power increase means less
over-heating issue. Following picture shows the performance characteristic of the feature.
P
IN
vs. VIN
5. Flicker-less Application
VAS1106A provides excellent performance for Flicker-less application with VAS1001. It does not
require large value capacitors and minimize total components. It’s an ideal solution for space limited
applications.
D1
AC
LED
R4
R3
C2
T1
T2
SET2
SNS
VAS1106A
SET1
R
SET1
R5
C1
VSS
R
SET2
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