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iML8683 Schematic ( PDF Datasheet ) - IML
| Teilenummer | iML8683 |
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| Beschreibung | Three Terminal Current Controller | |
| Hersteller | IML | |
| Logo |  |
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Gesamt 12 Seiten 
iML8683
Three Terminal Current Controller
General Description
The iML8683 is a Three Terminal Current
Controller (TTCC) for regulating the current flowing
through an LED string.
The application of the iML8683 is configured in
parallel with an LED string. The iML8683 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
VAC
BD
U1
iML8683
Applications
AC LED lighting engine.
LED light bulb.
LED1 LED light tube.
LED down-light and ceiling light
LED flat panel light
LED2
Pin Diagram (Top View)
Rz
U2
iML8683
LED3
Q1
iML3160
ZD U3
iML8683
CS 1
NC 2
A3
6 MS1
5 MS2
4K
DFN- 2mmx2mm-6L
CS MS1
54
Rectified
VAC
ILED
123
A K MS2
SOT-89- 5L
t
© 2014 Exar Corporation
t
8683DOC rev 1.2 1
 
iML8683
Three Terminal Current Controller
Note 1: For ADJ option, the regulating current is determined by an external resistor, REXT, connected between the CS pin and the K pin.
The mode selection function will not change the current ratio of option ADJ. To activate the line regulation function, the chip (U3)
connected in series with the LED string should be set in Mode 0 (MS1 and MS2 connected to pin K). The regulating current will
be:
IPEAK=0.27/REXT
And the maximum regulating current of second step (ex: U2 in Mode 1) should not exceed 80% of the top level (ex: U3 in Mode
0), otherwise the circuit operation might become abnormal when OTP function is activated. It is strongly recommended to set at
75%.
Note 2: The user can add an external resistor REXT between the CS pin and the K pin of U3 (Mode 0, serial connected to the LED string)
to increase the regulating current of option C1, C2, C3, D1, D2 and D3, as shown in below. For U1 ~ U2 (Mode 1 ~ Mode 3,
parallel connected to the LED string), adding an external resistor REXT between the CS pin and the K pin may cause abnormal
operation and chip damage.
For option C1/ C2/ C3, the regulating current variation ΔIPEAK/IPEAK = 6.25/REXT.
For option D1/ D2/ D3, the regulating current variation ΔIPEAK/IPEAK = 3.13/REXT.
LED
iML8683
REXT
Option C1
Option C2
Option C3
Option D1
Option D2
Option D3
U3 (Mode 0) regulating current
Without external
With 100Ω external
resistor
resistor
40 42.5
66 70.1
52 55.3
80 82.5
132 136.1
104 107.3
Note 3: The Regulating Current Line Regulation is defined as:
For Mode 1~3:
For Mode 0:
∆I /I =LR PEAKx
IAK(VAK=40V)-IAK(VAK=5V)
IAK(VAK=5V)
,
x=1~3
∆I /I =LR
PEAK0
IAK(VAK=40V)-IAK(VAK=5V)
IAK(VAK=5V)
Note 4: The CS Pin Voltage Line Regulation is defined as:
For Mode 1~3:
For Mode 0:
∆V /V =LR
CS
VCS(VAK=40V)-VCS(VAK=5V)
VCS(VAK=5V)
∆V /V =LR
CS
VCS(VAK=40V)-VCS(VAK=5V)
VCS(VAK=5V)
Note 5: Dropout voltage＝VAK @ 90% × (IPEAK0 @ VAK＝5V)
Note 6: When TJ > TTP, the peak regulating current decreases linearly to around 50% at 175°C.
IAK
IPEAKx
ITP
0
TTP TTSD TJ
(130°C) (175°C)
© 2014 Exar Corporation
8683DOC rev 1.2 6
6 Page 
iML8683
Three Terminal Current Controller
Records of Revisions
Rev.
1.0
1.1
Date
Feb. 7, 2014
Mar. 6, 2014
1.2 Nov. 21, 2014
Page
All
1, 2, 3, 11
3
5, 6
7, 8, 9
10, 11
12
Description
First release.
Remove package types of TO-252.
Update the Block Diagram and I-V Curve.
Update the TTP Range and Notes.
Update the Application Circuits.
Udate the Package Dimension and Footprint Suggestion.
Add Records of Revision
© 2014 Exar Corporation
8683DOC rev 1.2 12
12 Page | ||
| Seiten | Gesamt 12 Seiten | |
| PDF Download | [ iML8683 Schematic.PDF ] | |
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