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PDF ILD4071 Data sheet ( Hoja de datos )
| Número de pieza | ILD4071 | |
| Descripción | LED Driver | |
| Fabricantes | Infineon | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ILD4071 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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LED Driver for High Power LEDs
ILD4071
700mA High Integration - DC/DC Step-Down Converter
Datasheet
Rev. 1.0, 2011-11-16
1 page  
ILD4071
Block Diagram
2 Block Diagram
The ILD4071 regulates the LED current by monitoring the load current (Peak Current Measurement) through the
internal switch cycle by cycle. When the current through the switch reaches the threshold Ipeak the switch is shut-
OFF and it is kept OFF for a time equal to tOFF. Both Ipeak and tOFF can be fixed through few external components.
The peak current Ipeak is fixed by a resistor connected to the SET pin while the tOFF is fixed by RC network. As tOFF
is fixed and the duty cycle depends on VREC, the frequency depends on VREC as well. Refer to Chapter 8.2 for the
evaluation of the switching frequency.
PWMI 5
FREQ
6
EN
3
OFF-Time
Control
ON/OFF
Logic
VREC
1
Internal
Supply
UV+OV
Lockout
8 SW
internal
PWM
Generation
Thermal
Protection
ST 2
Open Load
Detection
Logic
Power-
Switch Driver
Peak Current
Adjustment
Peak Current
Measurement
Power
Switch
Figure 1 Block Diagram ILD4071
4
SET
7
GND
Datasheet
5 Rev. 1.0, 2011-11-16
5 Page 
ILD4071
5.2 Power Supply Monitoring
Over- and Undervoltage shutdown
If the supply voltage VREC drops below the Input under voltage threshold voltage VREC,UVOFF, the power stage is
switched OFF and the device is in normal consumption mode (Iq,ON).
If VREC rises again and reaches the Input under voltage startup threshold VREC,UVON the power stage is restarted
and the device is back to normal operation mode.
Same behavior applies to overvoltage.
The internal status transistor is switching off during an overvoltage or undervoltage event on VREC.
A detailed description of the under- and overvoltage behavior is displayed in Figure 3 below.
VREC
VR EC,UVo ff
VR EC,U Vh yst
VR EC,OVoff
VREC,U Von
VR EC,OVh yst
VR EC,OVo n
VSW
ILED
Iset
ST
t
t
t
ST pull-
down ON
ST pull-down transistor OFF
ST pull-
down ON
Figure 3 Over- and Undervoltage Protection
ST pull-down transistor OFF
ST pull-
down ON
t
Datasheet
11 Rev. 1.0, 2011-11-16
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ILD4071.PDF ] | |
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