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TPIC74101QPWPRQ1 Folha de dados(PDF) 11 Page - Texas Instruments |
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TPIC74101QPWPRQ1 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 32 page S0182-01 Switch Control Current Control FB SMPS Q1 Q2 Q3 Q4 Input Voltage L1 L2 33µH V driver V OUT 22µF–470µF TPIC74101-Q1 www.ti.com SLIS140 – OCTOBER 2011 boost mode until V(driver) exceeds 5.8 V; at which time, the device enters the buck mode. When the device is operating in boost mode and V(driver) is in the crossover window of 5.8 V to 5 V, the output regulation may contain a higher than normal ripple and only maintain a 3% tolerance. This ripple and tolerance depends on the loading and improves with a higher loading condition. When the device is operated with low-power mode active (CLP = low) and high output currents ( >50 mA), the buck/boost transitioning can cause a reset signal at the RESET pin. Buck SMPS In buck mode, the duty cycle of transistor Q1 sets the voltage VOUT. The duty cycle of transistor Q1 varies 10% to 99% depending on the input voltage, V(driver). If the peak inductor current (measured by Q1) exceeds 450 mA (typical), Q2 is turned on for this cycle (synchronized rectification). Otherwise, the current recirculates through Q2 as a free-wheeling diode. The detection for synchronous or asynchronous mode is done cycle-by-cycle. To avoid a cross-conduction current between Q1 and Q2, an inherent delay is incorporated when switching Q1 off and Q2 on and vice versa. In buck mode, transistor Q3 is not required and is switched off. Transistor Q4 is switched on to reduce power dissipation. The switch timings for transistors Q3 and Q4 are not considered. In buck mode, the logical control of the transistors does not change. Figure 2. Buck/Boost Switch Mode Configuration Boost SMPS In boost mode, the duty cycle of transistor Q3 controls the output voltage VOUT. The duty cycle is internally adjusted 5% to 85% depending on the internally sensed voltage of the output. Synchronized rectification occurs when V(driver) is below 5 V. To avoid a discharging of the buffer capacitor, a simultaneous switching on of Q3 and Q4 is not allowed. An inherent delay is incorporated between Q3 switching off and Q4 switching on and vice versa. In boost mode, transistor Q2 is not required and remains off. Transistor Q1 is switched on for the duration of the boost-mode operation (serves as a supply line). Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPIC74101-Q1 |
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