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IR3080M Datasheet(PDF) 6 Page - International Rectifier |
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IR3080M Datasheet(HTML) 6 Page - International Rectifier |
6 / 21 page IR3080 PIN DESCRIPTION PIN# PIN SYMBOL PIN DESCRIPTION 1 VIDFB Feedback to the VCCVID regulator. Connect to the VCCVID output. 2 VCCVID 1.2V/150mA Regulator Output. Can also drive external pass transistor to minimize on-chip power dissipation 3 VIDPWR Power for VID Pull-up resistors and VCCVID Regulator 4-9 VID0-5 Inputs to VID D to A Converter. On-chip 700 ohm pull-up resistors to VIDPWR pin are included. 10, 11, 13,14 TRM1-4 Used for precision post-package trimming of the VDAC voltage. Do not make any connection to these pins. 12 VOSNS- Remote Sense Input. Connect to ground at the Load. 15 ROSC Connect a resistor to VOSNS- to program oscillator frequency and FB, OCSET, BBFB, and VDAC bias currents 16 VDAC Regulated voltage programmed by the VID inputs. Current Sensing and PWM operation are referenced to this pin. Connect an external RC network to VOSNS- to program Dynamic VID slew rate. 17 OCSET Programs the hiccup over-current threshold through an external resistor tied to VDAC and an internal current source. Over-current protection can be disabled by connecting this pin to a DC voltage no greater than 6.5V (do not float this pin as improper operation will occur). 18 IIN Current Sense input from the Phase IC(s). To ensure proper operation bias to at least 250mV (don’t float this pin). 19 VDRP Buffered IIN signal. Connect an external RC network to FB to program converter output impedance 20 FB Inverting input to the Error Amplifier. Converter output voltage is offset from the VDAC voltage through an external resistor connected to the converter output voltage at the load and an internal current source. 21 EAOUT Output of the Error Amplifier 22 BBFB Input to the Regulation Detect Comparator. Connect to converter output voltage and VDRP pin through resistor network to program recovery from VID step-down. Connect to ground to diable Body Braking TM during transition to a lower VID code. 23 VBIAS 6.8V/5mA Regulated output used as a system reference voltage for internal circuitry and the Phase ICs 24 VCC Power for internal circuitry 25 LGND Local Ground and IC substrate connection 26 RMPOUT Oscillator Output voltage. Used by Phase ICs to program Phase Delay 27 HOTSET Inverting input to VRHOT comparator. Connect resistor divider from VBIAS to LGND to program VRHOT threshold. Diode or thermistor may be substituted for lower resistor for enhanced/remote temperature sensing. Applying a voltage exceeding approximately 7.5V disables the oscillator for factory testing. 28 VRHOT Open Collector output of the VRHOT comparator. Connect external pull-up. 29 SS/DEL Controls Converter Softstart, Power Good, and Over-Current Delay Timing. Connect an external capacitor to LGND to program the timing. An optional resistor can be added in series with the capacitor to reduce the over-current delay time. 30 PWRGD Open Collector output that drives low during Softstart and any external fault condition. Connect external pull-up. 31 VIDPGD Open Collector output of the VCCVID Power Good circuitry. Connect external pull- up. 32 VIDDEL Connect an external capacitor to LGND to program the VCCVID Power Good delay Page 6 of 41 9/30/04 |
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