Datasheet

22uF
5V / 1A
10uF
2.2 µH
(5 .. 17)V
3.3nF
TPS62153
PVIN
AVIN
EN
SS/TR
DEF
FSW
SW
VOS
PG
FB
AGND
PGND
100k
TRSSFB
RAV
/
.. ××= m52640
22uF
10uF
2.2 µH(4 .. 17) V
0.3R187k
ADIM
PVIN
AVIN
EN
SS/TR
DEF
FSW
SW
VOS
PG
FB
AGND
PGND
TPS62150
TPS62150, TPS62150A
TPS62151, TPS62152, TPS62153
www.ti.com SLVSAL5B –NOVEMBER 2011–REVISED JUNE 2013
Application Example As Power LED Supply
The TPS62150 can be used as a power supply for power LEDs. The FB pin can be easily set down to lower
values than nominal by using the SS/TR pin. With that, the voltage drop on the sense resistor is low to avoid
excessive power loss. Since this pin provides 2.5µA, the FB pin voltage can be adjusted by an external resistor
per Equation 15. This drop, proportional to the LED current, is used to regulate the output voltage (anode
voltage) to a proper level to drive the LED. Both analog and PWM dimming are supported with the TPS62150.
Figure 40 shows an application circuit, tested with analog dimming:
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Figure 40. Single Power LED Supply
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The resistor at SS/TR sets the FB voltage to a level of about 300mV and is calculated from Equation 15.
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(15)
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The device now supplies a constant current, set by the resistor at the FB pin, by regulating the output voltage
accordingly. The minimum input voltage has to be rated according the forward voltage needed by the LED used.
More information is available in the Application Note SLVA451.
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Typical Applications
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Figure 41. 5V/1A Power Supply
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Product Folder Links: TPS62150, TPS62150A TPS62151 TPS62152 TPS62153