iML8684
Three Terminal Current Controller
General Description
The iML8684 is a Three Terminal Current
Controller (TTCC) for regulating the current flowing
through an LED string.
The application of the iML8684 is configured in
parallel with an LED string. The iML8684 can work
as voltage controlled current source, current
regulator, or cut-off. It is suitable for the
applications adopting periodical AC voltage source.
The PCB layout is also very flexible to meet
various shape requirements. It is especially
suitable for replacing incandescent light bulb and
linear type fluorescent lamp.
Features
System
-
-
-
-
-
-
-
-
-
-
All solid state components.
No electrolytic capacitor required.
Compact size to minimize mechanical cost.
Driver-on-board and chip-on-board available which
minimize process flow and assembly cost.
High PF and Low THD performance.
High efficiency achieved.
Flexible PCB layout style.
Wide range of LED forward voltage selection.
Distributed heat to several chips.
TRIAC dimmable.
Chip
- 88V input sustaining voltage.
-
<3V dropout voltage for up to 150mA regulating current.
Typical Application Circuit
V
AC
LED1
BD
Applications
AC LED lighting engine.
LED light bulb.
LED light tube.
LED down-light and ceiling light
LED flat panel light
CS
NC
A
U1
iML8684
Rz1
LED2
Pin Diagram (Top View)
LED3
MS1
MS2
K
CS
NC
A
Rz2
U2
iML8684
CS
1
2
3
6
5
4
MS1
NC
A
MS2
K
MS1
MS2
K
Q1
iML3160
ZD
CS
NC
A
MS1
MS2
K
DFN- 2mmx2mm-6L
CS
5
U3
iML8684
MS1
4
Rectified
V
AC
1
2
3
A
K
MS2
SOT-89- 5L
I
LED
t
t
© 2014 Exar Corporation.
8684DOC rev 1.1
1
iML8684
Three Terminal Current Controller
Ordering Information
Package Type: DFN– 2mm x 2mm – 6L (Halogen Free)
Part Number
iML8684NL-C1
iML8684NL-C2
iML8684NL-C3
iML8684NL-D1
iML8684NL-D2
iML8684NL-D3
iML8684NL-ADJ
Tape and Reel
iML8684NL-C1-TR
iML8684NL-C2-TR
iML8684NL-C3-TR
iML8684NL-D1-TR
iML8684NL-D2-TR
iML8684NL-D3-TR
iML8684NL-ADJ-TR
1 Line
Marking
i84C1
i84C2
i84C3
i84D1
i84D2
i84D3
i84AD
st
Regulating Current (mA)
(Mode 0, MS1 and MS2 connected to pin K)
40
66
52
80
130
104
Determined by external resistor only
Package Type: SOT–89 – 5L (Halogen Free)
Part Number
iML8684BP-C1
iML8684BP-C2
iML8684BP-C3
iML8684BP-D1
iML8684BP-D2
iML8684BP-D3
iML8684BP-ADJ
Tape and Reel
iML8684BP-C1-TR
iML8684BP-C2-TR
iML8684BP-C3-TR
iML8684BP-D1-TR
iML8684BP-D2-TR
iML8684BP-D3-TR
1 Line
Marking
i8684C1
i8684C2
i8684C3
i8684D1
i8684D2
i8684D3
st
Regulating Current (mA)
(Mode 0, MS1 and MS2 connected to pin K)
40
66
52
80
130
104
Determined by external resistor only
iML8684BP-ADJ-TR
i8684AD
Dice
Part Number
iML8684BZ-C1
iML8684BZ-C2
iML8684BZ-C3
iML8684BZ-D1
iML8684BZ-D2
iML8684BZ-D3
iML8684BZ-ADJ
Regulating Current (mA)
(Mode 0, MS1 and MS2 connected to pin K)
40
66
52
80
130
104
Determined by external resistor only
© 2014 Exar Corporation.
8684DOC rev 1.1
2
iML8684
Three Terminal Current Controller
Block Diagram
+
A
Thermal
Protection
Logic
Circuit
V
AK
CS
MS1
R
EXT
MS2
K
-
I
AK
I-V Curve
Cx / Dx Options
I
AK
I
PEAK0
I
PEAK1
I
PEAK2
I
PEAK3
Mode 0
Mode 1
ADJ Options
I
AK
I
PEAK
Mode 0 ~ Mode 3
Mode 2
Mode 3
0
0
V
DROP
V
AK
V
DROP
V
AK
© 2014 Exar Corporation.
8684DOC rev 1.1
3
iML8684
Three Terminal Current Controller
Pin Descriptions
Pin Number
Pin Name
DFN
CS
A
K
MS2
MS1
NC
1
3
4
5
6
2
SOT-89
5
1
2
3
4
-
Current sense pin. Connected to negative end of LED string.
Regulating current input pin. Connected to positive end of LED
string.
Regulating current output pin.
Mode selection pin 2. Floating or connecting to pin K only.
Mode selection pin 1. Floating or connecting to pin K only.
No Connection
Exposed thermal pad of the chip. Use this pin to enhance the
power dissipation ability. The thermal conductivity will be
improved if a copper foil on PCB is soldered with the thermal pad.
It is recommended to connect the thermal pad to pin K.
Pin Function
Exposed Thermal Pad
Absolute Maximum Ratings
Caution:
Values beyond absolute ratings can cause the device to be prematurely damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not
guaranteed.
A to K
Sustaining Voltage
CS, MS1, MS2 to K
Regulating Current
Maximum Operating Junction Temperature, T
J
Operating Temperature, T
opr
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
Note:
1). All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal.
2). All parameters having Min/Max specifications are guaranteed. Typical values are for reference purpose only.
3). Unless otherwise noted, all tests are pulsed tests at the specified temperature, therefore: T
J
= T
C
= T
A
.
-0.3V ~ 88V
-0.3V ~ 1V
150mA
165C
-40C to 110C
-55C to 150C
260C
Recommended Operating Conditions
Parameter
Regulating Current (with Adequate Heat Sinking)
*Note
Symbol
I
AK
V
AK
T
J
T
A
Min
Typ
Max
130
Unit
mA
V
C
C
Input Voltage
*Note
3
80
150
Maximum Junction Temperature
Operating Free-Air Temperature Range
-30
100
Note: Due to thermal dissipation consideration, the maximum LED Vf in parallel should decrease with the regulating current.
© 2014 Exar Corporation.
8684DOC rev 1.1
4
iML8684
Three Terminal Current Controller
Electrical Characteristics
Unless otherwise noted, typical values are @ T
A
= 25 C.
Parameter
Symbol
Test Conditions
Option C1
Option C2
Peak Regulating Current
*Note 1,2
o
Min
38.4
63.4
49.9
76.8
124.8
99.8
Typ
40
66
52
80
130
104
100
Max
41.6
68.6
54.1
Unit
I
PEAK0
V
AK
=5V,
Mode 0
(MS1/ MS2 connected
to K)
Option C3
Option D1
Option D2
Option D3
mA
83.2
135.2
108.2
I
PEAK0
/I
PEAK0
Option C1/C2/C3/D1/D2/D3,
Mode 0, V
AK
=5V
(MS1/ MS2 connected to K)
Current Ratio of Mode
Selection
*Note 1
I
PEAK1
/I
PEAK0
Option C1/C2/C3/D1/D2/D3,
Mode 1, V
AK
=5V
(MS1 open, MS2 connected to K)
75
80
85
%
I
PEAK2
/I
PEAK0
Option C1/C2/C3/D1/D2/D3,
Mode 2, V
AK
=5V
(MS2 open, MS1 connected to K)
50
55
60
I
PEAK3
/I
PEAK0
Option C1/C2/C3/D1/D2/D3,
Mode 3, V
AK
=5V
(MS1/ MS2 open)
32
35
38
Option C1/C2/C3/D1/D2/D3,
Regulating Current Line
*Note 3
Regulation
△I
LR
/I
PEAKx
(x=0~3)
Mode 1~3, V
AK
=5V and 40V
Option C1/C2/C3/D1/D2/D3,
Mode 0, V
AK
=5V and 40V
Option ADJ, Mode 0,
V
AK
=5V, with 1KΩ external
resistor between CS and K
Option ADJ,
Mode 1~3, V
AK
=5V and 40V
with 1KΩ external resistor
between CS and K
Option ADJ,
Mode 0, V
AK
=5V and 40V
with 1KΩ external resistor
between CS and K
Mode 0
(MS1/ MS2 connected to K)
When T
J
is higher than T
TP
, the
peak regulating current
decreases to I
TP
linearly.
T
J
= 175C
120
-4
±1
±2
%
-8
-15
CS Pin Voltage
V
CS
0.26
0.27
0.28
V
±1
±2
%
CS Pin Voltage Line
*Note 4
Regulation
△V
LR
/V
CS
-4
-8
2.8
130
-15
3.8
%
V
C
Dropout Voltage
*Note 5
V
DROP
T
TP
I
TP
/I
PEAKx
(x=0~3)
Thermal Protection Trip
*Note 6
Temperature
Thermal Protection Mode
Regulating Current
50
%
© 2014 Exar Corporation.
8684DOC rev 1.1
5
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