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REG71050DDCT Datasheet(PDF) 8 Page - Texas Instruments |
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REG71050DDCT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 22 page THEORY OF OPERATION PEAK CURRENT REDUCTION OFF SWITCHED Step-Down(Buck)Mode OFF ON C PUMP Q 1 Q 3 Q 2 Q 4 C IN C OUT V OUT V IN Step-Up(Boost)Mode (A) (B) OFF ON ON OFF C PUMP Q 2 Q 4 C OUT V OUT C PUMP Q 2 Q 4 C OUT V OUT OFF ON Q 1 Q 3 ON OFF Q 1 Q 3 C IN V IN C IN V IN REG710 SBAS221F – DECEMBER 2001 – REVISED MARCH 2008............................................................................................................................................... www.ti.com During the second half cycle the FET switched are The REG710 regulated charge pump provides a configured as shown in Figure 19B, and the voltage regulated output voltage for input voltages ranging on CPUMP is added to VIN. The output voltage is from less than the output to greater than the output. regulated by skipping clock cycles as necessary. This is accomplished by automatic mode switching within the device. When the input voltage is greater than the required output, the unit functions as a variable frequency switch-mode regulator. This In normal operation, the charging of the pump and operation is shown in Figure 18. Transistors Q1 and output capacitors usually leads to relatively high peak Q3 are held off, Q4 is on, and Q2 is switched as input currents which can be much higher than that of needed to maintain a regulated output voltage. the average load current. The regulator incorporates circuitry to limit the input peak current, lowering the When the input voltage is less than the required total EMI production of the device and lowering output voltage, the device switches to a step-up or output voltage ripple and input current ripple. Input boost mode of operation, as shown in Figure 19. capacitor (CIN) supplies most of the charge required A conversion clock of 50% duty cycle is generated. by input current peaks. During the first half cycle the FET switches are configured as shown in Figure 19A, and CPUMP charges to VIN. Figure 18. Simplified Schematic of the REG710 Operating in the Step-Down Mode Figure 19. Simplified Schematic of the REG710 Operating in the Step-Up or Boost Mode 8 Submit Documentation Feedback Copyright © 2001–2008, Texas Instruments Incorporated Product Folder Link(s): REG710 |
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