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TPS65141PWPRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS65141PWPRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 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 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 8.8 9.8 10.8 11.8 12.8 13.8 14.8 Vo1 − Output Voltage − V Vo2 = −8 V TA = −40°C TA = 25°C TA = 85°C Vo1 5 V/div VI = 3.3 V VO = 10 V, 500 µs/div Vo2 5 V/div Vo3 10 V/div Vo1 5 V/div VI = 3.3 V VO = 10 V, IO = 300 mA 500 µs/div II 500 mA/div TPS65140, TPS65141 TPS65145 SLVS497E – SEPTEMBER 2003 – REVISED NOVEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) POWER-UP SEQUENCING SOFT START VO1 VO2 MAXIMUM LOAD CURRENT Figure 10. Figure 11. Figure 12. VO3 MAXIMUM LOAD CURRENT VO3 MAXIMUM LOAD CURRENT Figure 13. Figure 14. DETAILED DESCRIPTION The TPS6514x series 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. Main Boost Converter 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 TPS6514x series maintains continuous conduction even at light load currents. This is accoplished using the Virtual Synchronous Converter Technology for improved load transient response. This architecture uses 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. 10 Submit Documentation Feedback Copyright © 2003–2012, Texas Instruments Incorporated Product Folder Links: TPS65140 TPS65141 TPS65145 |
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