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TPS62046DGQ Datasheet(PDF) 13 Page - Texas Instruments |
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TPS62046DGQ Datasheet(HTML) 13 Page - Texas Instruments |
13 / 21 page TPS62040 TPS62042,TPS62043 TPS62044,TPS62046 SLVS463A − JUNE 2003 − REVISED OCTOBER 2003 www.ti.com 13 APPLICATION INFORMATION ADJUSTABLE OUTPUT VOLTAGE VERSION When the adjustable output voltage version TPS62040 is used, the output voltage is set by the external resistor divider. See Figure 15. The output voltage is calculated as: V O + 0.5 V 1 ) R1 R2 with R1 + R2 ≤ 1 MΩ and internal reference voltage Vref typical = 0.5 V R1 + R2 should not be greater than 1 M Ω because of stability reasons. To keep the operating quiescent current to a minimum, the feedback resistor divider should have high impedance with R1+R2 ≤1 MΩ. Due to this and the low reference voltage of Vref = 0.5 V, the noise on the feedback pin (FB) needs to be minimized. Using a capacitive divider C1 and C2 across the feedback resistors minimizes the noise at the feedback, without degrading the line or load transient performance. C1 and C2 should be selected as: C1 + 1 2 p 10 kHz R1 with: R1 = upper resistor of voltage divider C1 = upper capacitor of voltage divider For C1 a value should be chosen that comes closest to the calculated result. C2 + R1 R2 C1 with: R2 = lower resistor of voltage divider C2 = lower capacitor of voltage divider For C2, the selected capacitor value should always be selected larger than the calculated result. For example, in Figure 15 for C2 100 pF are selected for a calculated result of C2 = 88.42 pF. If quiescent current is not a key design parameter C1 and C2 can be omitted, and a low impedance feedback divider has to be used with R1 + R2 < 100 kΩ. This reduces the noise available on the feedback pin (FB) as well but increases the overall quiescent current during operation. The higher the programmed output voltage the lower the feedback impedance has to be for best operation when not using C1 and C2. VIN VIN EN MODE SW FB PGND PGND SW GND 2 3 1 49 10 5 7 8 6 TPS62040 C3 10 µF VI 2.5 V to 6 V L1 10 µH C4 10 µF VO 1.8 V / 1.2 A R1 470 k Ω R2 180 k Ω C1 33 pF C2 100 pF Figure 15. Adjustable Output Voltage Version (3) (4) (5) |
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