AS3693B
austriamicrosystems
AS3696
4 channel white LED controller for general lighting
applications
Product specification
General Description
The AS3696 is a 4 channels precision LED controller
with PWM inputs or internal PWM generator for driving
external FETs in precise lighting applications. Build in
safety features include thermal shutdown as well as
open and short LED detection.
2x2 Channel LED driver
Output current only limited by external FET
Build in shunt regulator
Absolute current accuracy +/- 1%
Channel to channel accuracy +/- 1%
Normal Mode
Linear current control with external voltage
Digital PWM control with PWM input
Build in PWM-generator with analog duty cycle
control
Current Boost Mode
Linear current control with external voltage
Digital PWM control with 2 PWM inputs
Open LED detection and auto-turnoff
Short LED detection and auto-turnoff
Temperature shutdown
2x automatic supply regulation feedback
Package QFN 32pin 5x5mm, 0.5mm pitch
Package TQFP 32pin 7x7mm, 0.8mm pitch
Applications
Commercial, industrial and retail lighting
Streetlights
Large panel LED backlighting
1 Block Diagram
Vsupply
VDD
xFAULT
FB12
FB34
V2_5
S1 G1
D1
S2 G2
D2
S3 G3
D3
S4 G4
D4
SMPS
feedback
Rosc
Cosc
Fault detectors
Oscillator
AS3696
Reference
Vshort
Vfb
Vref
Vset2
Vset1
Vduty
CB_PWM12
CB_PWM34
CB_MODE
xPD
PWM
SEL
PWM control
EPAD
VSS
Sel_PPTrim
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AS3696
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2 Typical Application
R2
R2
SMPS1
Rfb
R1
Rfb
R1
SMPS2
24V
Rvdd
G1
S1
S2
S3
V DD
Vduty
PWM
SEL
Precision current sink
CB_PWM12
CB_PWM34
CB_MODE
PWM
controller
AS3696
Safety features
Supply feedback
FB12
FB34
xFault
Cfb
1uf-10uF
Cfb
1uf-10uF
xPD
Vref
Oscillator
Vset1 Vset2
Vref
Vfb
Vshort
V2_5
VSS
Epad
2.2uF
Rosc
Cosc
G4
S4
G2
D3
G3
D1
D2
D4
Cvdd
2.2uF
Sel_PPTrim
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AS3696
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3 Electrical Characteristics
3.1
Absolute Maximum Ratings
Stresses beyond those listed may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated in
Section “Electrical Characteristics” is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Symbol
V
DDMAX
V
IN_2.5V
V
IN_5V
V
IN_50V
I
latch
T
STRG
Parameter
Supply voltage
Maximum voltage
Maximum voltage
Maximum voltage
Latch-Up immunity
Storage Temperature Range
Humidity
V
ESD_LV
V
ESD_HV
T
BODY
Note:
Electrostatic Discharge on all pins
( except D1...D4 )
Electrostatic Discharge on pins
D1 ... D4
Body Temperature during
Soldering
(1) Pins: V2_5, Vfb
(2) Pins: All pins except V2_5, D1-D4, Vfb
(3) Pins: D1 – D4
Min
-0.3
-0.3
-0.3
-0.3
-100
-55
5
-2000
-4000
Max
5.4
V2_5
+0.3V
VDD
+0.3V
50
+100
150
85
2000
4000
260
Unit
V
V
V
V
C
%
V
V
C
Note
Voltage limit due to internal shunt
regulator.
Applicable for 2.5V pins
Applicable for 5V pins
(2)
(1)
Applicable for 50V pins
(3)
mA Norm: EIA/JESD78
Maximum Junction Temperature
Non condensing
Norm: MIL 883 E Method 3015
Human body model
Norm: MIL 883 E Method 3015
Human body model
according to IPC/JEDEC J-STD-
020C
3.2
Operating Conditions
3.2.1 General
Symbol
Rthja
P
DERATE
Tamb
Tj
Parameter
Thermal resistance
junction – ambient
PT Derating Factor
Ambient Temperature
Junction Temperature
Conditions
QFN32
QFN32
33
-30
-30
85
115
Min
Typ
30
Max
Unit
°C/W
mW/
C
°C
°C
3.2.2 Power supply
Symbol
VDDint
IDDmax
VDDext
Parameter
Conditions
Min
5.0
Typ
5.2
Max
5.5
30
no shunt regulator operation. No external
current limiting resistor needed
4.0
4.5
4.9
Unit
V
mA
V
Shunt regulator operation. Supply current has
Supply Voltage VDD
to be limited between 10mA and 30mA by
shunt regulator operation
external resistor
Maximum shunt regulator
current
Supply Voltage VDD
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AS3696
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Symbol
VDD_
POR
IDD_q
IDD_r
V2_5
I2_5
Vref
Rvref
Parameter
Power on reset level
Quiescent current
Supply current
V2_5 regulator output
V2_5 output current
Reference voltage
Output resistance Vref
Conditions
Circuit stays in power down until VDD_POR is
reached. G1 – G4 is pulled to GND during
power down
VDD= 5V, Default setting, PWM = 0
VDD = 5V, PWM = 240Hz, Duty = 50%
Min
2.4
Typ
Max
3.0
Unit
V
mA
1
2.5
2.4
2.5
10
2.6
1
1.24
1.25
300
1.26
mA
V
mA
V
Ω
3.2.3 Current outputs
Symbol
Vdx
Rdx
Vgx
Igx
Rsx
Parameter
Output voltage pins Dx
Input resistance in Dx
Max output voltage pin Gx
Max output current pin Gx
Input resistance pin Sx
1
PWM = 0 U_DX=16V
PWM = 1
Igx = 1mA
1
0.1
VDD-
0.5
VDD
1
Conditions
Min
Typ
Max
50
Unit
V
MΩ
MΩ
V
mA
MΩ
Iled_
250
Current accuracy
Trimmed during production
ILED =100mA, Temp = 25°C,
external NMOS-Transistor used,
Vset1 = 250mV
(excluding error of external Rset)
Trimmed during production
ILED =100mA, Temp = 25°C,
external NMOS-Transistor used,
Vset1 = 250mV
(excluding error of external Rset)
-1.0
+1.0
%
Ich_
250
Channel to channel
Current accuracy
-1.0
+1.0
%
Tjunction = -20°C to +100°C
(1)
Vset1 = 200mV to 500mV
Iled_
all
Current accuracy
-2.0
+2.0
%
external NMOS-Transistor used,
(excluding error of external Rset)
Note:
(1) It is not recommended to use Vset < 200mV in order to minimize influences from PCB-layout and
noise.
3.2.4 Feedback circuit, fault detectors
Symbol
IFBmax
RFBmin
IFB_g
Vfb
Parameter
Feedback current
maximum
Minim output resistance
FB transconductance
Feedback voltage trip
point
Short LED detector
Voltage
Over temperature limit
VDx = 0.3V
IFB_g = ΔI
FB
/ ΔV
Dx
Trip voltage at Pins Dx
Short LED detection level voltage
Short will be detected if:
0
Conditions
Min
Typ
300
300
-3
3
1000
Max
Unit
uA
Ω
mA/V
V
Vshort
Tovtemp
0
130
140
2
150
V
°C
((V_Dx -VsetX) /5 + VsetX) > Vshort
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AS3696
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Symbol
Thyst
Parameter
Over termperature
hysteresis
Conditions
Min
Typ
10
Max
Unit
°C
3.2.5 PWM-inputs
Symbol
fPWM
Parameter
PWM-input frequency
Conditions
Pins: PWM, CB_PWM12, CB_PWM34
Min
0
Typ
Max
1
Unit
kHz
3.2.6 Oscillator
Symbol
UrefH
UrefL
Parameter
Reference Voltage high
Reference Voltage low
Conditions
Min
3.1
0.0
Typ
3.2
0.1
Max
3.3
0.2
Unit
V
V
3.2.7 Digital pins
Symbol
V
IH
V
IL
VoH
VoL
VoL_PD
R_pu
R_pd
Parameter
High Level Input voltage
Low Level Input voltage
High Level output voltage
Low Level output voltage
Low level output voltage open
drain outputs
Input resistance PullUp inputs
Input resistance PullDown inputs
300
300
Min
1.3
-0.3
VDD-
0.3
VDD-
0.3
VDD-
0.3
Typ
Max
VDD
0.8
Unit
V
V
V
V
V
kΩ
kΩ
I=mA
I=mA
I=mA
Note
3.3
Pins equivalent circuit
VDD
VDD
7V
GND
Digital inputs
VDD
7V
GND
Digital inputs Pull up
VDD
7V
GND
Digital inputs Pull Down
VDD
7V
GND
Digital outputs push/pull
7V
VDD
GND
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