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TPS54331 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS54331 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 46 page  TPS55383 ,, TPS55386 www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008 TERMINAL FUNCTIONS (continued) TERMINAL I/O DESCRIPTION NAME NO. Power input to the Output 1 high side MOSFET only. This pin should be locally bypassed to GND with a PVDD1 1 I low ESR ceramic capacitor of 10- µF or greater. The PVDD2 pin provides power to the device control circuitry, provides the pull-up for the EN1 and EN2 pins and provides power to the Output 2 high-side MOSFET. This pin should be locally bypassed to PVDD2 16 I GND with a low ESR ceramic capacitor of 10- µF or greater. The UVLO function monitors PVDD2 and enables the device when PVDD2 is greater than 4.1 V. This pin configures the output startup mode. If the SEQ pin is connected to BP, then when Output 2 is enabled, Output 1 is allowed to start after Output 2 has reached regulation; that is, sequential startup where Output 1 is slave to Output 2. If EN2 is allowed to go high after the outputs have been operating, then both outputs are disabled immediately, and the output voltages decay according to the load that is present. For this sequence configuration, tie EN1 to ground. If the SEQ pin is connected to GND, then when Output 1 is enabled, Output 2 is allowed to start after Output 1 has reached regulation; that is, sequential startup where Output 2 is slave to Output 1. If EN1 is allowed to go high after the outputs have been operating, then both outputs are disabled immediately, SEQ 12 I and the output voltages decay according to the load that is present. For this sequence configuration, tie EN2 to ground. If left floating, Output 1 and Output 2 start ratio-metrically when both outputs are enabled at the same time. They will soft start at a rate determined by their final output voltage and enter regulation at the same time. If the EN1 and EN2 pins are allowed to operate independently, then the two outputs also operate independently NOTE: An internal two resistor (150-k Ω each) divider connects BP to SEQ and to GND. See the Sequence States table. Source (switching) output for Output 1 PWM. A snubber is recommended to reduce ringing on this SW1 3 O node. See SW Node Ringing for further information. Source (switching) output for Output 2 PWM. A snubber is recommended to reduce ringing on this SW2 14 O node. See SW Node Ringing for further information. Thermal Pad - - This pad must be tied externally to a ground plane and the GND pin. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS55383 TPS55386 |
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