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TPIC74101QPWPRQ1 데이터시트(PDF) 10 Page - Texas Instruments |
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TPIC74101QPWPRQ1 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 32 page TPIC74101-Q1 SLIS140 – OCTOBER 2011 www.ti.com See the converter efficiency plots in the Typical Characteristics section to determine power dissipation. Modulator Frequency Setting (Terminal Rmod) The Rmod terminal adjusts the clock modulator frequency. A resistor of Rmod = 12 kΩ generates a modulation frequency of 28 kHz. The modulator function may be disabled by connecting Rmod to GND and the device operates with the nominal frequency. The modulator function cannot be activated during IC operation, only at IC start-up. Ground Terminal (PGND) The PGND terminal is the power ground for the device. Enable Terminal (ENABLE) The ENABLE terminal allows the enabling and disabling of the switch mode regulator. A maximum of 40 V may be applied to this terminal to enable the device and increasing it above the V(driver) input voltage does not affect the device operation. The functionality of the ENABLE terminal is described in the following table: ENABLE FUNCTION 0 Vreg is off. Open Undefined 1 Vreg is on. Bootstrap Terminals (Cboot1 and Cboot2) An external bootstrap capacitor is required for driving the internal high-side MOSFET switch. A 4.7-nF ceramic capacitor is typically required. Functional Modes Clock Modulator To minimize EMI issues associated with the switch-mode regulator, the device offers an integrated clock modulator. The function of the clock modulator is to modulate the switching frequency and to distribute the energy over the wave band. The average switching frequency is 380 kHz (typical) and varies between 285 kHz and 480 kHz at a rate set by the Rmod resistor. A typical value of 12 kΩ on the Rmod terminal relates to a 28-kHz modulation frequency. The clock modulator function can only be activated during IC start-up, not during IC operation. The equation for the modulation frequency is as follows: f(mod) (Hz) = (–2.2 × Rmod) + 54.5 kHz, when Rmod = 8 kΩ to 16 kΩ. Bigger resistor values like 100 kΩ are also allowed for Rmod. Buck/Boost Transitioning The operation mode switches automatically between buck and boost modes depending on the input voltage of V(driver) and output load conditions. During start up, when V(driver) is less than 5.8 V (typical), the device starts in boost mode and continues to run in boost mode until V(driver) exceeds 5.8 V; at which time, the device switches over to buck mode. In buck mode, the device continues to run in buck mode until it is required to switch back to boost to hold regulation. This crossover window to switch to boost mode is when V(driver) is between 5.8 V and 5 V and depends on the loading conditions. When Vdriver drops below 5.8 V but the device is holding regulation (~2%), the device remains in buck mode. However, when V(driver) is within the 5.8-V to 5-V window and VOUT drops to 4.9 V, the device crosses over to boost mode to hold regulation. In boost mode, the device remains in 10 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TPIC74101-Q1 |
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