TLD5045EJ Infineon Technologies, TLD5045EJ Datasheet - Page 4

• Manufacturer Part Number: TLD5045EJ
• Manufacturer: Infineon Technologies

Specifications of TLD5045EJ

• Packages: PG-DSO-8
• Topology: DC-DC Buck
• Vs (min): 5.0 V
• Vs (max): 40.0 V
• Vq (max): -
• Iq (max): 700.0 mA

2
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 I
OFF and it is kept OFF for a time equal to t
The peak current I
is fixed and the duty cycle depends on V
evaluation of the switching frequency.
Figure 1
Datasheet
PWMI
ST
Block Diagram
Block Diagram TLD5045
5
2
peak
Protection
Generation
Thermal
is fixed by a resistor connected to the SET pin while the t
internal
PWM
Open Load
Detection
OFF-Time
FREQ
Control
REC
6
OFF
Logic
, the frequency depends on V
Peak Current
Adjustment
. Both I
SET
EN
3
4
peak
4
ON/OFF
and t
Logic
OFF
Switch Driver
Measurement
Peak Current
Power-
can be fixed through few external components.
Internal
Supply
REC
as well. Refer to
OFF
VREC
GND
1
7
is fixed by RC network. As t
Switch
Power
Lockout
UV+OV
peak
Rev. 1.0, 2011-05-27
Chapter 8.2
the switch is shut-
Block Diagram
8
TLD5045EJ
SW
for the
OFF