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| TLD5045EJ_15 Datasheet, PDF (4/30 Pages) Infineon Technologies AG – 700mA High Integration - DC/DC Step-Down Converter | |||
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Infineon® LITIX⢠Power
TLD5045EJ
Block Diagram
2
Block Diagram
The TLD5045 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 EN
6
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
4
7
SET
GND
Figure 2-1 Block Diagram TLD5045EJ
Data Sheet
4
Revision 1.0
2015-05-28
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