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TPS65140-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS65140-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 9 10 11 12 13 14 15 Vo1 − Output Voltage − V Vo3 = 18 V (Doubler Mode) TA = 25°C TA = 85°C TA = −40°C 0 0.02 0.04 0.06 0.08 0.10 0.12 9 10 11 12 13 14 15 Vo1 − Output Voltage − V Vo3 = 28 V (Tripler Mode) TA = 25°C TA = 85°C TA = −40°C DETAILED DESCRIPTION Main Boost Converter Power-Good Output Enable and Power-On Sequencing (EN, ENR) TPS65140-Q1 TPS65145-Q1 SGLS277A – NOVEMBER 2004 – REVISED APRIL 2008 ................................................................................................................................................. www.ti.com Vo3 MAXIMUM LOAD CURRENT Vo3 MAXIMUM LOAD CURRENT Figure 13. Figure 14. The TPS65140/45 consists of a main boost converter operating with a fixed switching frequency of 1.6 MHz to allow for small external components. The boost converter output voltage Vo1 is also the input voltage, connected via the pin SUP, for the positive and negative charge pump. The linear regulator controller is independent from this system with its own enable pin. This allows the linear regulator controller to continue to operate while the other supply rails are disabled or in shutdown due to a fault condition on one of their outputs. Refer to the functional block diagram for more information. The main boost converter operates with PWM and a fixed switching frequency of 1.6 MHz. The converter uses a unique fast response, voltage mode controller scheme with input voltage feedforward. This achieves excellent line and load regulation (0.2% A load regulation typical) and allows the use of small external components. To add higher flexibility to the selection of external component values, the device uses external loop compensation. Although the boost converter looks like a nonsynchronous boost converter topology operating in discontinuous mode at light load, the TPS65140/45 maintains continuous conduction even at light load currents. This is achieved with a novel architecture using an external Schottky diode and an integrated MOSFET in parallel connected between SW and SUP (see the functional block diagram). The integrated MOSFET Q2 allows the inductor current to become negative at light load conditions. For this purpose, a small integrated P-channel MOSFET with typically 10 Ω rDS(on) is sufficient. When the inductor current is positive, the external Schottky diode with the lower forward voltage conducts the current. This causes the converter to operate with a fixed frequency in continuous conduction mode over the entire load current range. This avoids the ringing on the switch pin as seen with a standard nonsynchronous boost converter and allows a simpler compensation for the boost converter. The TPS65140/45 has an open-drain power-good output with a maximum sink capability of 1 mA. The power-good output goes high as soon as the main boost converter Vo1 and the negative and the positive charge pumps are within regulation. The power-good output goes low as soon as one of the outputs is out of regulation. In this case, the device goes into shutdown at the same time. See the electrical characteristics table for the power-good thresholds. The device has two enable pins. These pins should be terminated and not left floating to prevent faulty operation. Pulling the enable pin (EN) high enables the device and starts the power-on sequencing with the main boost converter Vo1 coming up first, then the negative and positive charge pumps. The linear regulator has an independent enable pin (ENR). Pulling this pin low disables the regulator, and pulling this pin high enables this regulator. 10 Submit Documentation Feedback Copyright © 2004–2008, Texas Instruments Incorporated Product Folder Link(s): TPS65140-Q1 TPS65145-Q1 |
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