TECHNICAL DATA
HIGH-VOLTAGE LED DRIVER
WITH BUILD-IN MOSFET SWITCH
FEATURES
▪
Operating temperature range -40 ..+85 ºС
▪
ON-resistance of the MOSFET switch
210 Ohm for ambient temperature 25 ºС
1
2
3
IL9921/22/23
TO-92
SOT-89
▪
OFF-state breakdown voltage of the
MOSFET switch not less 500 V for
Ambient temperature 25 ºC.
ORDERING INFORMATION
Device
IL9921LF, IL9922LF, IL9923LF
IL9921PT, IL9922PT, IL9923PT
Operating
Temperature Range
Т
А
= - 40 ... + 85
С
Package
TO-92
SOT-89
1. Drain
2.
2. GND
3. V
DD
1.Drain
2.GND
3.V
DD
Packing
Tape
Tape & Reel
DESCRIPTION
IL9921, IL9922, IL9923 are high-voltage LED driver control ICs with build-in MOSFET switch
and purposed for LED lighting control.
They allow efficient operation of LED strings from voltage sources ranging up to 400VDC.
The IL9921/22 includes an internal high-voltage switching MOSFET controlled with fixed off-time
TOFF of approximately 10µs. The LED string is driven at constant current, thus providing constant
light output and enhanced reliability. The output current is internally fixed at 20mA for IL9921,
50mA for IL9922 and 30mA for IL9923. The peak current control scheme provides good regulation
of the output current throughout the universal AC line voltage range of 85 to 264V AC or DC input
voltage of 20 to 400V.
PIN DESCRIPTION
Pin No
1
2
3
Symbol
Drain
GND
V
DD
Description
This is a drain terminal of the output switching MOSFET and a
linear Regulator input.
This is a common connection for all circuits
This is a power supply pin for all control circuits.
Bypass this pin with a 0.1uF low impedance capacitor.
1
2011, February, Ver. 01
IL9921/IL9922/IL9923
BLOCK DIAGRAM
V
DD
DRAIN
VT1
REGULATOR
7.5 V
REFERENCE
VOLTAGE
SOURCE
RC-OSCILLATOR
V
REF
-
+
S
Q
FORMER
VT2
R
Q
DELAY LINE
R1
2
2011, February, Ver. 01
IL9921/IL9922/IL9923
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
V
DD
Parameter
Input voltage
Low-voltage (control) part of IC supply
voltage
Limit
Min
-0.3
-0.3
Max
420
10
Unit
V
V
* 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 conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATION RANGE
Symbol
V
IN
Input voltage
Parameter
Limit
Min
20
Max
400
Unit
V
ELECTRICAL CHARACTERISTICS
Limit
Symbol
V
DDR
I
DD
R
ON
V
UVLO
I
SAT
Parameter
Regulator output voltage
Low-voltage (control) part
of IC consumption
current
ON-resistance of the
switch (DRAIN pin)
Undervoltage threshold
(Low-voltage part of IC)
MOSFET saturation
current (DRAIN pin)
OFF-state breakdown
voltage of the MOSFET
switch (DRAIN pin)
Threshold current
IL9921
IL9922
IL9923
OFF time
(DRAIN pin)
Minimum ON-time of the
switch (DRAIN pin)
Leading Edge Blanking
Delay
V
DD
= V
DDR
V
IN
= 50 V
Test Condition
V
IN
= (20- 400)V
V
DD
= 9,5 V
V
IN
= 40 V
V
DD
= V
DDR
I
DRAIN
= 20 mA
V
DD
= V
UVLO
I
DRAIN
= 20 mA
V
DD
= V
DDR
V
SAT
= 50 V
V
DD
= V
DDR
I
DRAIN
= 1 mA
V
DD
= V
DDR
V
IN
= 50 V
Min
5.5
-
-
4.0
100
Max
9.0
350
210
V
DDR
–
0.3
-
25
10
Ambient
temperature,
o
C
Unit
V
uA
Ohm
V
mA
V
BR
500
20.5
52.0
30.8
8.0
-
200
-
V
25
10
-40
85
I
TH
25.5
63.0
38.2
13.0
650
400
mA
us
ns
ns
T
OFF
T
ON
T
BLANK
25
10
3
2011, February, Ver. 01
IL9921/IL9922/IL9923
RECOMMENDED APPLICATION DIAGRAM
AC – AC supply voltage source
С1 – capacitor C= 0.1uF ± 10 %
D1 – microcircuit
L1 – inductor (coil)
Inductor feature L, mH, is calculated by formula:
15
N
UF
dI
O
L=
,
N – Quantity of diodes in LED string, pcs.;
V
F
– LED forward voltage for nominal current, V;
dI
O
– LED circuit permissible current ripple, mA
LED
1
– LED
N
– LEDs (light emitting diodes) with nominal current:
- 20 mA for IL9921 application;
- 50 mA for IL9922 application;
- 30 mA for IL9923 application
VD1 – high-voltage diode with breakdown voltage not less 500V
and forward current:
- not less 25.5 mA for IL9921 application;
- not less 63.0 mA for IL9922 application;
- not less 38.2 mA for IL9923 application
4
2011, February, Ver. 01
IL9921/IL9922/IL9923
PACKAGE DIMENSION
TO-92
Taping Specification
5
2011, February, Ver. 01
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