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TPS43061 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS43061 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 38 page 0 200 400 600 800 1000 1200 30 100 900 Resistance (k Ω) G001 57500 ( ) ( ) W = T sw R k f kHz TPS43060 TPS43061 www.ti.com SLVSBP4C – DECEMBER 2012 – REVISED SEPTEMBER 2013 DETAILED DESCRIPTION OPERATION The TPS43060 and TPS43061 are high-performance wide input range synchronous boost controllers that accept a 4.5 V to 38 V (40 V abs max) input and support output voltages up to 58 V. The devices have gate drivers for both the low side N-channel MOSFET and the high side synchronous rectifier N-channel MOSFET. Voltage regulation is achieved employing constant frequency current mode pulse width modulation (PWM) control. The switching frequency is set either by an external timing resistor or by synchronizing to an external clock signal. The switching frequency is programmable from 50 kHz to 1 MHz in the resistor programmed mode or can be synchronized to an external clock between 300 kHz to 1 MHz. The PWM control circuitry turns on the low side MOSFET at the beginning of each oscillator clock cycle, as the error amplifier compares the output voltage feedback signal at the FB pin to the internal 1.22 V reference voltage. The low side MOSFET is turned-off when the inductor current reaches a threshold level set by the error amplifier output. After the low side MOSFET is turned off, the high side synchronous MOSFET is turned on until the beginning of the next oscillator clock cycle or until the inductor current reaches the reverse current sense threshold. The input voltage is applied across the inductor and stores the energy as inductor current ramps up during the portion of the switching cycle when the low side MOSFET is on. Meanwhile the output capacitor supplies load current. When the low side MOSFET is turned off by the PWM controller, the inductor transfers stored energy via the synchronous MOSFET to replenish the output capacitor and supply the load current. This operation repeats every switching cycle. The devices feature internal slope compensation to avoid sub-harmonic oscillation that is intrinsic to peak current mode control at duty cycles higher than 50%. They also feature adjustable soft-start time, optional lossless inductor DCR current sensing, an output power good indicator, cycle-by-cycle current limit and over-temperature protection. SWITCHING FREQUENCY The switch frequency is set by a resistor (RT) connected to the RT/CLK pin of the TPS43060 and TPS43061. The relationship between the timing resistance RT and frequency is shown in the Figure 17. The resistor value required for a desired frequency can be calculated using Equation 1. (1) Figure 17. Frequency vs RT Resistance The device switching frequency can be synchronized to an external clock that is applied to the RT/CLK pin. The external clock should be in the range of 300 kHz to 1 MHz. The required logic levels of the external clock are shown in the specification table. The pulse width of the external clock should be greater than 20ns to ensure proper synchronization. A resistor between 57.5 k Ω and 1150 kΩ must always be connected from the RT/CLK pin to ground when the converter is synchronized to an external clock. Do not leave this pin open. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS43060 TPS43061 |
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