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TPS61059DRCR Datasheet(PDF) 15 Page - Texas Instruments |
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TPS61059DRCR Datasheet(HTML) 15 Page - Texas Instruments |
15 / 30 page www.ti.com R S + V SENSE I LED + 0.75 0.5 + 1.5 W V OUT(MAX) + 4.4 ) 0.75 + 5.15 V (9) I LED(FLASH) [ R2 ) R3 2 R3 R S R3 + 100 kW (recommended value) R2 + 47 kW (calculated) (10) Vx [ 1 2 ) R3 2 R2 * ILED R3 R S R2 V X + 1.1 V @ I LED + 150 mA (movie−light) V X + 1.4 V @ I LED + 45 mA (pre−load) (11) Vx [ R5 R4 ) R5 nFLASH R5 R4 ) R5 + 0.78 R5 + 10 kW (recommended value) R4 + 2.7 kW (calculated) (12) Vx [ R5 R4 ) R5 nFLASH R5 R4 ) R5 + 0.61, R5 + 1.57 R4, R5 + R5 R6 R5 ) R6 R6 + 7.5 kW (calculated) (13) IOK M1 R4 nFLASH R3 R2 RS ILED V X VSENSE R6 R5 IBIAS FB = 500 mV TPS61058 TPS61059 SLVS572B – APRIL 2005 – REVISED DECEMBER 2005 The following example is used to explain the procedure to size the external components for a given set of requirements: • Movie-light mode: I LED = 150 mA • Flashlight mode: I LED = 500 mA • LED forward voltage: V F (MAX) = 4.4 V at 500 mA • nFLASH signal is 1.8 V logic compliant (0 V and 1.8 V ±4%) Step 1 – Current Sense Resistor Calculation – RS Step 2 – Feedback Divider Resistor Calculation – R2, R3 Step 3 – Bias Resistor Network Calculation – R4, R5, R6 During the pre-charge phase, IOK is high impedance. In movie-light mode, IOK is grounded. Figure 19. Feedback Network Equivalent Circuit 15 |
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