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LX1664ACN Datasheet(PDF) 7 Page - Microsemi Corporation |
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LX1664ACN Datasheet(HTML) 7 Page - Microsemi Corporation |
7 / 17 page ![]() DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC LX1664/1664A, LX1665/65A PRODUCT DA T ABOOK 1996/1997 7 Copyright © 1999 Rev. 1.2 11/99 P RODUCTION D ATA S HEET SS 1 1 INV 2 2 V CC_CORE 33 VID0 4 4 VID1 5 5 VID2 6 6 VID3 7 7 VID4 8 8 L FB 99 PWRGD N.C. 10 L DRV 10 11 OV N.C. 12 C T 11 13 V CC 12 14 BDRV 13 15 GND 14 16 TDRV 15 17 V C1 16 18 Soft-Start pin, internally connected to the non-inverting input of the error comparator. Inverting input of the error comparator. Output voltage. Connected to non-inverting input of the current-sense comparator. Voltage Identification pin (LSB) input used to set output voltage. Voltage Identification pin (2nd SB) input. Voltage Identification pin (3rd SB) input. Voltage Identification pin (4th SB) input. Voltage Identification pin (MSB) input. This pin is also the range select pin — when low (CLOSED), output voltage is set to between 1.30 and 2.05V in 0.05V increments. When high (OPEN), output is adjusted from 2.0 to 3.5V in 0.1V increments. Linear regulator feedback pin. 1.5V reference is connected to a resistor divider to set desired output voltage. Open collector output pulls low when the output voltage is out of limits. Linear regulator drive pin. Connect to gate of MOSFET for linear regulator function. SCR driver goes high when the processor's supply is over specified voltage limits. The off-time is programmed by connecting a timing capacitor to this pin. This is the (12V) supply to the IC, as well as gate drive to the bottom FET. This is the gate drive to the bottom FET. Leave open in non-synchronous operation (when bottom FET is replaced by a Schottky diode). Both power and signal ground of the device. Gate drive for top MOSFET. This pin is a separate power supply input for the top drive. Can be connected to a charge pump when only 12V is available. Pin LX1664 LX1665 Name Pin # Pin # Description FUNCTIONAL PIN DESCRIPTION |
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