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TPS60230RGTTG4 Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS60230RGTTG4
Description  WHITE LED CHARGE PUMP CURRENT SOURCE WITH PWM BRIGHTNESS CONTROL
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS60230RGTTG4 Fiches technique(HTML) 8 Page - Texas Instruments

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PWM
ILED(D1)
0 V
PWM Into EN1 and EN2, VI = 3.6 V,
ILED = 20 mA, 5 LEDs Connected,
f = 1 kHz, TA = 255C
200 ms/div
0 A
PWM
ILED(D1)
0 V
PWM Into EN1 and EN2, VI = 3.6 V,
ILED = 20 mA, 5 LEDs Connected,
f = 32 kHz, TA = 255C
5 ms/div
0 A
EN1 + EN2
II
0 V
0 A
0 V
VOUT
VI = 3.6 V, ILED = 20 mA,
5 LEDs Connected,
TA = 255C
20
µs/div
DETAILED DESCRIPTION
OPERATION
TPS60230
SLVS516A – MAY 2004 – REVISED JUNE 2004
DIMMING RESPONSE
DIMMING RESPONSE
Figure 9.
Figure 10.
STARTUP TIMING
Figure 11.
The TPS60230 uses a fractional conversion charge pump to generate a supply voltage for the integrated current
sinks. These current sinks are used to ensure a constant current for each LED. Depending on the input voltage
and programmed LED current, the charge pump either operates in the 1x mode or in the 1.5x mode. By
switching automatically between these two modes, the circuit optimizes power conversion efficiency as well as
extends operating time by allowing the discharge of the battery completely.
The charge pump can generate 125 mA of output current, so each of the 5 LED outputs can be powered with up
to 25 mA of current. The maximum LED current is set by a resistor connected to the ISET pin. This resistor
programs a reference current, which is current mirrored to set the LED current.
8


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