ISSUED DATE :2004/02/23 REVISED DATE :2004/10/21C G432 Adjustable Shunt Regulator Description The G432 series are three-terminal adjustable precision shunt regulators with guaranteed stable temperature over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 1.24V (VREF) up to 20V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.2 . Active output circuitry provides very sharp turn-on characteristics, making these devices excellent improved replacements for Zener diodes in many applications. The precise +/- 2% reference voltage tolerance of G432 make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it. Features *Precision reference voltage A Rank: 1.24V 0.5% , B Rank: 1.24V 1% , C Rank: 1.24V 2.0% *Sink current capability: 200 mA. *Minimum cathode current for regulation: 150 A. *Equivalent full-range temp coefficient: 30 ppm/ . *Fast turn-on Response. *Low dynamic output impedance: 0.2 . *Programmable output voltage to 20V. *Low output noise. Package Dimensions REF. A B C D E F Millimeter Min. Max. 2.70 3.10 2.40 2.80 1.40 1.60 0.35 0.50 0 0.10 0.45 0.55 REF. G H K J L M Millimeter Min. Max. 1.90 REF. 1.00 1.30 0.10 0.20 0.40 0.85 1.15 0 10 Typical Application Circuit Block Diagram G432 Symbol 1/5 ISSUED DATE :2004/02/23 REVISED DATE :2004/10/21C Absolute Maximum Ratings at Ta = 25 Symbol Ratings Junction Temperature Parameter Tj +150 Unit Storage Temperature Tstg -65 ~ +150 Cathode Voltage VKA 20 V Continuous Cathode Current IKA -10~+250 mA Reference Input Current Range IREF -0.05~+10 mA Total Power Dissipation PD 225 mW Electrical Characteristics(Ta = 25 Parameter Reference Voltage ,unless otherwise specified.) Symbol G432C G432B VREF G432A Min Typ. Max. 1.215 1.24 1.265 1.228 1.24 1.252 1.234 1.24 1.246 Unit Test Conditions V VKA= VREF , IK=10mA (Fig.1) VKA= VREF , IK=10mA Ta=Full range (Fig.1) Deviation of reference Input Voltage Over temperature(note1) VREF/ T - 3.0 20 mV Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage VREF/ VKA - -1.4 -2.0 mV/V IREF - 1.4 3.5 uA IK=10mA,R1=10K ,R2= - 0.4 1.2 uA IK=10mA,R1=10K ,R2= Ta=Full range(Fig.2) IKA(min) - 0.15 0.3 mA VKA=VREF(Fig.1) IKA(off) - 0.1 1.0 uA VKA=20V,VREF=0 (Fig.3) ZkA - 0.2 0.5 Reference Input Current Deviation of reference Input Current Over Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Output Impedance (note2) IREF IK=10mA (Fig.2) VKA=20V~VREF (Fig.2) VKA=VREF, IK=1 ~100mA F 1.0KHz(Fig.1) Note1. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference over the full temperature range. The average temperature coefficient of the reference input voltage VREF is defined as: Where: T2 – T1 = full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. Note2. The dynamic output impedance, RZ, is defined as: G432 2/5 ISSUED DATE :2004/02/23 REVISED DATE :2004/10/21C When the device is programmed with two external resistors R1 and R2 (see figure 2.), the dynamic output impedance of the overall circuit, is defined as: Test Circuits Typical Performance Characteristics G432 3/5 ISSUED DATE :2004/02/23 REVISED DATE :2004/10/21C G432 4/5 ISSUED DATE :2004/02/23 REVISED DATE :2004/10/21C Application Examples Important Notice: All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of GTM. GTM reserves the right to make changes to its products without notice. GTM semiconductor products are not warranted to be suitable for use in life-support Applications, or systems. GTM assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: Taiwan: No. 17-1 Tatung Rd. Fu Kou Hsin-Chu Industrial Park, Hsin-Chu, Taiwan, R. O. C. TEL : 886-3-597-7061 FAX : 886-3-597-9220, 597-0785 China: (201203) No.255, Jang-Jiang Tsai-Lueng RD. , Pu-Dung-Hsin District, Shang-Hai City, China TEL : 86-21-5895-7671 ~ 4 FAX : 86-21-38950165 G432 5/5