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HV9123NG Datasheet(PDF) 7 Page - Supertex, Inc |
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HV9123NG Datasheet(HTML) 7 Page - Supertex, Inc |
7 / 7 page 7 HV9120/HV9123 1 8 4 5 6 7 16 9 15 14 13 12 11 10 1 8 2 3 4 5 6 7 16 9 15 14 13 12 11 10 BIAS FB COMP Reset Shutdown V REF Discharge OSC In Error Amplifier The error amplifier in the HV912x is a true low-power differential input operational amplifier intended for around-the-amplifier com- pensation. It is of mixed CMOS-bipolar construction: A PMOS input stage is used so the common-mode range includes ground and the input impedance is very high. This is followed by bipolar gain stages which provide high gain without the electrical noise of all-MOS amplifiers. The amplifier is unity-gain stable. Current Sense Comparators The HV912x uses a true dual comparator system with indepen- dent comparators for modulation and current limiting. This allows the designer greater latitude in compensation design, as there are no clamps (except ESD protection) on the compensation pin. Like the error amplifier, the comparators are of low-noise BiCMOS construction. Remote Shutdown The shutdown and reset pins of the HV912x can be used to perform either latching or non-latching shutdown of a converter as required. These pins have internal current source pull-ups so they can be driven from open-drain logic. When not used they should be left open, or connected to V DD. Output Buffer The output buffer of the HV912x is of standard CMOS construc- tion (P-channel pull-up, N-channel pull-down). Thus the body- drain diodes of the output stage can be used for spike clipping if necessary, and external Schottky diode clamping of the output is not required. Detailed Description (continued) +V IN NC NC Sense Output –V IN V DD OSC Out Pinout 16 Pin SOIC top view Note: Pins 2 and 3 are removed 16 Pin Dip Package top view BIAS FB COMP Reset Shutdown VREF Discharge OSC In +V IN Sense Output –V IN V DD OSC Out 19 20 1 2 3 18 17 16 15 14 13 12 11 10 9 4 5 6 7 8 • FB BIAS NC NC +V IN NC Discharge OSC In OSC Out V DD 20-pin PJ Package top view 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com 11/12/01 ©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. |
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