Document
IL3361D/ IL3361DH/ IZ3361
LED Driver with Average-Mode Constant Current Control (functional analog HV9961 Supertex Inc.)
The IL3361 is an average current, mode control LED driver IC operating in a constant off-time mode. This control IC does not produce a peak-to-average error, and therefore greatly improves accuracy, line and load regulation of the LED current without any need for loop compensation or high-side current sensing. The output LED current accuracy is ±3%. The IL3361 can be powered from an 8.0 - 450 VDC supply. The output current can be programmed by an internal 272 mV reference, or controlled externally through a 0 - 1.5 V dimming input.
FEATURES: • Fast average current control • Programmable constant off-time switching • Linear dimming input • PWM dimming input • Output short circuit protection • Ambient operating temperature
-40oC to +125oC • Pin-compatible with the IL9910 IC
APPLICATIONS: • DC/DC or AC/DC LED driver applications • LED backlight driver for LCD displays • General purpose constant current source • LED signage and displays • Architectural and decorative LED lighting • LED street lighting
Block diagram:
General view of ICs: IL3361D (plastic SO-8 case)
IL3361DH (plastic SO-16 case)
IZ3361 (dice)
Typical application circuit:
1
Ver.00/20.03.2012 IL3361e_tsp 338944
IL3361D/ IL3361DH/ IZ3361
IL3361D pin numbers displayed without brackets, brackets contain pin numbers for IL3361DH.
Pin and Pad Description:
Pad Pin number Symbol
number
IZ3361
1 2
8-Lead 16-Lead SOIC SOIC1*
11
--
VIN TEST
3 24
CS
4, 53* 6
3 4
5 8
GND GATE
7, 94* 6 12 8 59 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 7 13
Vdd PWM D
P6 P0 P1 P2 P3 P4 P5 LD
18 8 14
19 - 20 - 21 - -
RT
Prm2 Prm0 Prm1
Description
Input of an 8.0 - 450V linear regulator Test pad2* Current sense pin used to sense the FET current by means of an external sense resistor Ground return for all internal circuitry GATE driver output for an external N-channel power MOSFET Power supply pin for all internal circuits PWM dimming input of the IC Test pad2* Test pad2* Test pad2* Test pad2* Test pad2* Test pad2* Test pad2* Linear dimming input and it sets the current sense threshold as long as the voltage at this pin is less than 1.5V. If voltage at LD falls below 150mV, the GATE output is disabled. The GATE signal recovers at 200mV at LD A resistor connected between this pin and GND programs the GATE off-time Test pad2* Test pad2* Test pad2*
Ver.00/20.03.2012
2 IL3361e_tsp 338944
IL3361D/ IL3361DH/ IZ3361
Pad Pin number Symbol
Description
number
IZ3361 22
8-Lead 16-Lead SOIC SOIC1*
--
REF
Test pad2*
Note: 1) Pins 2, 3, 6, 7, 10, 11, 15, 16 of IL3361DH are not used 2) Contact pad 2, 10-16, 19-22 (test pads) are used for testing process on manufacturing fab only (have not to be bonded by customer) 3) Contact pad 4, 5 (Ground) are electrically connected 4) Contact pad 7, 9 (Power supply) are electrically connected
Electrical Characteristics:
Symbol Description
Min Typ Max Units Conditions
Input
V|NDC
Input DC supply voltage range1*
I|NSD Shut-down mode supply current *
Internal Regulator
VDD Internally regulated voltage
8.0 -
7.05
ΔVDD, line Line regulation of VDD
0
ΔVDD, load Load regulation of VDD
0
UVLO ΔUVLO
VDD under voltage lockout threshold* VDD under voltage lockout hysteresis
6.0 -
PWM Dimming
VEN(Io) VEN(hi) REN
PWM_D input low voltage*
PWM_D input high voltage*
Internal pull-down resistance at PWM D
- PWM dimming frequency
2.0 50
-
Average Current Sense Logic
VCS Current sense reference voltage *
ΔV(LD)
LD-to-CS voltage ratio*
VLD(OFF) LD input voltage, shutdown
AVLD (OFF) LD input voltage, enable
TBLANK
Current sense blanking interval*
TON(min)
Minimum on-time
DMAX
Maximum steady-state duty cycle
264 0.17
150 75
-
-
-
-
500
100 -
150 200 -
450 V 1.0 mA
7.75 V
1.0 V
100 mV
6.95 V - mV
0.8 V -V
150 kΩ
500 Hz
280 0.19
280 1000 -
mV -
mV mV ns ns %
DC input voltage Pin PWM_D to GND
VIN = 8.0V, IDD(ext) = 0, 500pF at GATE; RT = 226kΩ, PWM_D = VDD VIN = 8.0 - 450 V, IDD(ext)= 0, 500pF at GATE; RT = 226kΩ, PWM_D = VDD IDD(ext) = 0 - 1.0 mA, 500pF at GATE; RT = 226kΩ, PWM_D = VDD VIN rising
VIN falling
VIN = 8.0 - 450V VIN = 8.0 - 450V VPWMD = 5.0V
-
VLD falling VLD rising CS = VCS+30mV Reduction in output LED current may occur beyond this duty cycle
Ver.00/20.03.2012
3 IL3361e_tsp 338944
IL3361D/ IL3361DH/ IZ3361
Symbol Description
Min Typ Max Units Conditions
Short Circuit Protection
VCS TDELAY THICCUP
Hiccup threshold voltage Current limit delay CS-to-GATE Short circuit hiccup time
410 - 470 mV -
- - 150 ns CS = VCS+30mV - 395 - μs -
TON(min) Minimum on-time (short circuit)
- - 430 ns CS = VDD
TOFF TIMER
TOFF
Off time
8 - 12 μs RT = 226 kΩ
32 - 48
RT = 1.00 MΩ
GATE Driver
ISOURCE ISINK tRISE tFALL Notes
GATE sourcing current GATE sinking current GATE output rise time GATE output fall time
0.165 0.165
-
-
- A VGATE = 0V, VDD = 7.5V - A VGATE = Vdd, VDD = 7.5V 5.