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TPS61046YFFR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61046YFFR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page OUT REF V R1 1 R2 V § · u ¨ ¸ © ¹ VIN EN SW VOUT FB GND L1 4.72F 1.02F R1 R2 OFF ON C1 C2 2.7 V ~ 4.2 V 102H TPS61046 71.5k 1.0M 12 V TPS61046 www.ti.com SLVSCQ7 – APRIL 2015 9 Application and Implementation 9.1 Application Information The TPS61046 is a boost DC-DC converter with a PWM switch, a power diode and an input/output isolation switch integrated. The device supports up to 28-V output with the input range from 1.8 V to 5.5 V. The TPS61046 adopts the current-mode control with adaptive constant off-time. The switching frequency is quasi-constant at 1.0 MHz. The isolation switch disconnects the output from the input during shutdown to minimize leakage current. The following design procedure can be used to select component values for the TPS61046. 9.2 Typical Application - 12-V Output Boost Converter spacing Figure 11. 12-V Boost Converter 9.2.1 Design Requirements Table 1. Design Requirements PARAMETERS VALUES Input Voltage 2.7 V ~ 4.2 V Output Voltage 12 V Output Current 50 mA Output Voltage Ripple ±50mV 9.2.2 Detailed Design Procedure 9.2.2.1 Programming the Output Voltage There are two ways to set the output voltage of the TPS61046. When the FB pin is connected to the input voltage, the output voltage is fixed to 12 V. This function makes the TPS61046 only need three external components to minimize the solution size. The second way is to use an external resistor divider to set the desired output voltage. By selecting the external resistor divider R1 and R2, as shown in Equation 1, the output voltage is programmed to the desired value. When the output voltage is regulated, the typical voltage at the FB pin is VREF of 795 mV. (1) Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS61046 |
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