T a r ge t D a t a s h e et , R e v . 1 . 0 , J u l y 2 00 9
S t ep d ow n - L E D c on t r o l le r I C f or e x t e r n a l po w e r
stages
ILD4001
S m a l l S i g n a l D i s c r et e s
Edition 2009-07-06
Published by Infineon Technologies AG,
81726 München, Germany
©
Infineon Technologies AG 2009.
All Rights Reserved.
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ILD4001
Step down - LED controller IC for external power stages
ILD4001, Step down - LED controller IC for external power stages
Revision History: 2009-07-06, Rev. 1.0
Page
Subjects (major changes since last revision)
I
Target Datasheet
3
Rev. 1.0, 2009-07-06
ILD4001
Step down - LED controller IC for external power stages
Bipolar Buck- converter LED Controller IC
1
Bipolar Buck- converter LED Controller IC
Features
• Wide Input Voltage Range: 4.5V ... 40 V
• Over voltage protection
• Temperature shut down mechanism
• Integrated push- pull stage for fast on/off- switching
• Soft- Start capability
• Low shut down current < 200nA in operating voltage range
• Multifunctional Enable Pin
• Analog and PWM dimming possible
• PWM control for LED brightness possible
• Typical 3% output current accuracy
• Minimum external component required
• Small Package: SC-74
Applications
• LED Controller for industrial applications
• Universal Constant Current Source
• Generell Illumination e.g. Halogen Replacement
• Residential Architectural and Industrial Commercial Lighting for
in- and outdoor
• Signal and Marker Lights for Orientation or Navigation
(e.g. steps, exit ways, etc.)
4
5
6
1
2
3
2
Description
The ILD4001 is a hysteretic buck LED controller IC for industrial applications realized in a bipolar IC technology.
The LED Controller is capable to drive external bipolar or MOSFET power transistors by using the internal push-
pull output stage.
The IC incorporates a wide input voltage range and the output current level can be adjusted with an external sense
resistor.
According to the multifunctional control pin the IC can be switched on and off by an external signal, which is also
suitable to regulate brightness of the LEDs by PWM dimming.
Depending on the value of the switching inductor the switching frequency and the voltage ripple could be set.
The precise internal bandgap stabilizes the circuit and provides stable current conditions over temperature range.
Furthermore, over voltage protection and temperature shut down mechanism enforce the IC to protect attached
LEDs.
Additional features are included to protect the LED’s from overload, short circuit events as well as from over
voltage. The LED’s can be also protected against thermal overload by thermally coupling the LED’s to the
ILD4001.
Target Datasheet
4
Rev. 1.0, 2009-07-06
ILD4001
Step down - LED controller IC for external power stages
Description
ILD4001
Buck LED Controller
Vs
1
Vstab
Vstab
6 Isense
I/V
Over Voltage Protection
TSD
GND
2
5
GND
Vref
Vstab
EN/
3
PWM
Pflaum
4
Vdrive
ILD4001 _Block diagram .vsd
Figure 1
Block diagram
Pin Definition
Table 1
Pin number
1
2
3
4
5
6
Pin definition and function
Pin Symbol
Function
Supply Voltage
IC ground
Multifunctional Pin; Power On control voltage pin
(PWM input)
Push- Pull Switch Output
IC ground
LED current sense pin
V
s
GND
EN / PWM
V
drive
GND
I
sense
Target Datasheet
5
Rev. 1.0, 2009-07-06