IL9910BD Datasheet PDF - IK Semiconductor
| Part Number | IL9910BD | |
| Description | UNIVERSAL HIGH-VOLTAGE LED DRIVER | |
| Manufacturers | IK Semiconductor | |
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There is a preview and IL9910BD download ( pdf file ) link at the bottom of this page. Total 11 Pages | ||
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Universal High-Voltage LED Driver
TECHNICAL DATA
IL9910A/B/C
Description
The IL9910 is a PWM high-efficiency LED driver control IC.
The IC is purposed for control of LED lighting as source of constant current
Features
• 8V to 450V input range
• Maximum external consumption current on VDD pin IDD(ext) 1 mA
• Operating temperature range -40oC ~ +85oC
a Applications from a few mA to more than 1A Output
• Brightness control for LED string from one to hundreds of diodes
• PWM Low-Frequency LED Dimming
Application
•DC/DC or AC/DC LED Driver application
•RGB Backlighting LED Driver
•Back Lighting or Flat Panel Display
•General purpose constant current source
•Signage and Decorative LED Lighting
•Automotive
•Chargers
D- suffix
SO-8 case
N- suffix
DIP-8 case
DH suffix
16 SO-16 case
01
ORDERING INFORMATION
Device
IL9910AD
IL9910AN
IL9910ADH
IL9910BD
IL9910BN
IL9910BDH
IL9910CD
IL9910CN
IL9910CDH
Vcs
225~242mV
242~257mV
257~275mV
Package Operating Temperature Range
SOP 8
DIP 8
SOP 16
SOP 8
DIP 8
SOP 16
TA = - 40 ~ 85℃
SOP 8
DIP 8
SOP 16
1 November 2010, Ver. 02
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IL9910A/B/C
Application Information
AC/DC Off-Line Applications
The IL9910 is a low-cost off-line buck, boost or buck- boost converter control IC specifically designed or
driving multi-LED stings or arrays. It can be operated from either universal AC line or any DC voltage
between 8-450V. Optionally, a passive power factor correction circuit can be used in order to pass the AC
harmonic limits set by EN6100-3-2 Class C for lighting equipment having input power less than 25W. The
IL9910 can drive up to hundreds of High-Brightness (HB) LEDs or multiple strings of HB LEDs. The LED
arrays can be configured as a series or series/parallel connection. The IL9910 regulates constant current
that ensures controlled brightness and spectrum of the LEDs, and extends their lifetime. The IL9910 features
an enable pin (PWM_D) that allows PWM control of brightness.
The IL9910 can also control brightness of LEDs by programming continuous output current of the LED driver
(so-called linear dimming) when a control voltage is applied to the LD pin.
The IL9910 is offered in standard 8-pin SOIC and DIP packages. It is also available in a high voltage rated
SO-16 package for applications that require VIN greater than 250V.
The IL9910 includes an internal high-voltage linear regulator that powers all internal circuits and can also
serve as a bias supply for low voltage external circuitry.
LED Driver operation
The IL9910 can control all basic types of converters, isolated or non-isolated, operating in continuous or
discontinuous conduction mode. When the gate signal enhances the external power MOSFET, the LED
driver stores the input energy in an inductor or in the primary inductance of a transformer and, depending on
the converter type, may partially deliver the energy directly to LEDs. The energy stored in the magnetic
component is further delivered to the output during the off-cycle of the power MOSFET producing current
through the string of LEDs (Flyback mode of operation).
When the voltage at the VDD pin exceeds the UVLO threshold the gate drive is enabled. The output current is
controlled by means of limiting peak current in the external power MOSFET. A current sense resistor is
connected in series with the source terminal of the MOSFET. The voltage from the sense resistor is applied
to the CS pin of the IL9910. When the voltage threshold, the gate drive signal terminates, and the power
MOSFET turns off. The threshold is internally set to 250mV, or it can be programmed externally by applying
voltage to the LD pin. When soft start is required a capacitor can be connected to the LD pin to allow this
voltage to ramp at a desired rate, therefore, assuring that output current of the LED ramps gradually.
Optionally, a simple passive power factor correction circuit, consisting of 3 diodes and 2 capacitors, can be
added as shown in the application circuit diagram of Figure 2.
Supply Current
A current of 1mA is needed to start the IL9910. As shown in block diagram, this current is internally
generated in IL9910 without using bulky startup resistors typically required in the offline application.
Moreover, in many applications the IL9910 can be continuously powered using its internal linear regulator
that provides a regulated voltage of 7.5V for al internal circuits.
Setting Light Output
When the buck converter topology of Figure 2 is selected, the peak CS voltage is a good representation of
the average current in the LED. However, there is a certain error associated with this current sensing method
that needs to be accounted for. This error is introduced by the difference between the peak and the average
current in the inductor. For example if the peak-to-peak ripple current in the inductor is 150mA, to get a
500mA LED current, the sense resistor should be *Vcs/(500mA+0.5*150mA)= “Vcs/575mA”Ω.
(*Vcs A : 225~242mV / B : 242~257mV / C : 242~275mV)
Dimming
By input 0V to 250mV DC voltage to ADJ pin to change the current or switching the current on and off while
maintaining the constant current drive. When Voltage is higher than 250mV will not change the output
current.
Or control the LED brightness by varying the duty of the output drive current through a PWM signal input to
the PWM pin
November 2010, Ver. 02
5
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| Information | Total 11 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ IL9910BD.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
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