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TPS65100PWPRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS65100PWPRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page www.ti.com 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 VCOM Buffer Enable and Power On Sequencing (EN, ENR) TPS65100, TPS65101 TPS65105 SLVS496C – SEPTEMBER 2003 – REVISED APRIL 2006 VO3 MAXIMUM LOAD CURRENT VO3 MAXIMUM LOAD CURRENT Figure 13. Figure 14. The TPS6510x 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 pumps and the bias supply for the VCOM buffer. 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. See 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 TPS6510x 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 rDSon 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. VCOMIN is the input of the VCOM buffer. If the VCOM buffer is not required for certain applications, it is possible to shut down the VCOM buffer by statically connecting VCOMIN to ground, reducing the overall quiescent current. The VCOM buffer features soft start avoiding a large voltage drop at VO1 during start-up. The VCOMIN cannot be pulled dynamically to ground during operation. The device has two enable pins. These pins should be terminated and not left floating to prevent unpredictable 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 pump and the VCOM buffer. If the VCOMIN pin is held low, the VCOM buffer remains disabled. The linear regulator has an independent enable pin (ENR). Pulling this pin low disables the regulator, and pulling this pin high enables this regulator. If the enable pin EN is pulled high, the device starts its power on sequencing. The main boost converter starts up first with its soft start. If the output voltage has reached 91.25% of its output voltage, the negative charge 10 Submit Documentation Feedback |
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