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APW7055BNC-TUL Datasheet(PDF) 4 Page - Anpec Electronics Coropration |
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APW7055BNC-TUL Datasheet(HTML) 4 Page - Anpec Electronics Coropration |
4 / 11 page Copyright ANPEC Electronics Corp. Rev. A. Rev.A.1 - Dec., 2001 APW7055 www.anpec.com.tw 4 Functional Pin Description VCC (Pin 1) Provide a +5V bias supply for the IC to this pin. This pin also provides the gate bias charge for the MOS FETs of the source-sink regulator. The voltage at th is pin is monitored for Power-On Reset (POR) purposes. SS (Pin 2) This pin provides the soft start for the standard buck converter and source-sink regulator. Connect a ca- pacitor from this pin to ground.This capacitor, along with an internal 28uA current source,sets the soft-start interval of the converter and preventing the outputs from overshoot as well as limiting the input current . SD (Pin 3) T he pin shuts down all the outputs. A TTL-compatible, logic level high signal applied at this pin immediately discharges the soft-start capacitor,disabling all the outputs.When IC re-enabled, the IC undergoes a new soft-start cycle.Left open, this pin is pulled low by an internal pull-down resistor,enabling operation. SOURCE (Pin 4) Connect the pin to the upper MOSFET gate drive of the source-sink regulator. This pin is used to drive the 1. Recommended operating conditions, Unless otherwise noted. 2. Refer to Block and Simplified Power System Diagrams , and Typical Application Schematic. APW7055 Symbol Parameter Test Conditions Min. Typ. Max. Unit Protection VSEN O.V. trip point (VSEN/VDAC) VSEN Rising 115 120 VSEN O.V. Hysteresis 2 % I OCSET Ocset Current Source Vocset=3V 170 200 230 I SS Soft start Current 28 uA upper external MOSFET as a source regulator. SINK (Pin 5) Connect the pin to the lower MOSFET gate drive of the source-sink regulator.This pin is used to drive the lower external MOSFET as a sink regulator. FB (Pin 6) Connect this pin to output of the source-sink regulator. This pin provide the voltage feedback path for source and sink regulators. This pin is internally connected to the negative input of the source controller, and also connected to the positive input of the sink controller. VIN (Pin 7) Connect this pin to a voltage source. Two voltages, above 0.5VIN, are generated by an internal resistor divider as the reference voltage of the source and sink controllers. The internal resistor divider provides an offset voltage to ensure higher sink regulation voltage and prevent an direct current path through the upper and lower MOSFETs, damaging the two MOSFETs. GND (Pin 8) Signal ground for the IC. All voltage levels are mea sured with respect to this pin voltage protection. Electrical Characteristics (Cont.) |
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