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TPS60230RGTTG4 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS60230RGTTG4 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 21 page www.ti.com 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 |
Numéro de pièce similaire - TPS60230RGTTG4 |
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Description similaire - TPS60230RGTTG4 |
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