ET432 Adjustable Precision Shunt Regulator Description The ET432 is a three-terminal adjustable shunt regulator series with a guaranteed thermal stability over applicable industrial temperature ranges and wide operating current(up to 100mA).The output voltage between 1.24 and 18 volts by selection of two external divider resistors. The ET432 have a typical output impedance of 0.2 Ω . Active output ¾ ¾ ¾ ¾ ¾ ¾ ¾ ¾ circuitry provides a very sharp turn-on characteristic, making the APL431L excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies. Symbol ¾ ¾ ¾ ¾ ¾ ¾ Features Precise Reference Voltage to 1.24V . 0.2Ω Typical Output Impedance. Sink Current Capability, 80uA to 100mA. Temperature Range -40 to 125oC. Adjustable Output Voltage Vref to 18V Quick Turn-on. SOT-23,TO-92,SOT-89,SOT-23-5 packages Reference Voltage Tolerance at 25°C -0.5% ET432A -1% ET432B -1.5% ET432C Applications Precision Voltage Reference Linear Regulator Adjustable Power Supply Switching Power Supply Instrumentation Computer Disk Drivers Pin Description www.estek.com.cn 1 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Ordering Information Part Number Accurate Temperature Package ET432AAI Pin Assignment R A C Packing SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel ET432ABI SOP-23-5 1 2 3 Tape & Reel ET432BAI SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel ET432BBI SOP-23-5 1 2 3 Tape & Reel ET432CAI SOT-23 1 3 2 Tape & Reel TO-92 1 2 3 Tape & Box SOT-89 1 2 3 Tape & Reel SOP-23-5 1 2 3 Tape & Reel ET432AEI ET432ADI 0.5% ET432BEI 1% ET432BDI ET432CEI ET432CDI -40oC~+125oC 1.5% ET432CBI Absolute Maximum Ratings Symbol VKA IK Cathode Voltage Cathode Current Range(Continuous) Value Unit 18 V 100 mA mA IREF Reference Input Current Range 3 Toper. Operating Temperature Range -40~+125 o -40~+150 o -65~+150 o TJ Tstg Parameter Junction Temperature Range Storage Temperature Range C C C Thermal Characteristics Symbol Parameter Package Typical Value SOT-23 416 θJA Thermal Resistance From Junction to Ambient in Free Air. (Measured with the component mounted on a high effective thermal conductivity test board in free air.) TO-92 250 SOT-89 250 SOT-23-5 357 www.estek.com.cn 2 Unit o C/W Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Electrical Characteristics (Ta=25 °C, VKA=VREF, IK=10mA unless otherwise noted .) Symbol Parameter Test Condition Min. Reference input Voltage VREF Typ. Max. Unit 0.5% 1.234 1.240 1.246 1% 1.228 1.240 1.252 1.5% 1.223 1.240 1.258 Tmin≦Ta≦Tmax - 10 25 mV VKA=VREF, IK=10mA V VREF(dev) Deviation of Reference Input Voltage Over Full Temperature Range △VREF/△VKA Ratio of change in VREF to Change in Cathode Voltage VKA=VREF to 18V - -1 -2.7 mV/ V IREF Reference Input Current R1=10KΩ, R2=∞ - 0.25 0.5 uA IREF(dev) Deviation of Reference Input Current Over Full Temperature Range R1=10KΩ, R2=∞ - 0.05 0.3 uA IK(min) Minimum Cathode Current for Regulation VKA=VREF - 60 80 uA IK(off) Off-State Cathode Current VKA=18V, VREF=0 - 0.04 0.5 uA ZKA Dynamic Impedance IK=1mA to 100mA f≦1.0KHz - 0.2 0.4 Ω Test Circuit www.estek.com.cn 3 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Test Circuit (Continued) Typical Application Circuits Notes for Typical Application Circuits: 1. For the series regulator applications, add a compensation capacitor C1 between CATHODE and REF is strongly recommended to improve the stability of output voltage. 2. Set Vo according to the following equation: Vo=VREF(1+R1/R2)+IREFxR1. 3. Choose the Value for RB as below: (1). The maximum limit for RB should be such that the cathode current (IK) is greater than the minimum operating current (80uA) at VIN(MIN). (2). The minimum limit for RB should be such that the cathode current (IK) does not exceed 100mA under all load conditions, and the instantaneous turn-on value for IK does not exceed 120mA. B B B www.estek.com.cn 4 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Typical Characteristics www.estek.com.cn 5 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Typical Characteristics (Continued) www.estek.com.cn 6 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Typical Characteristics (Continued) www.estek.com.cn 7 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Package Information SOT-23 www.estek.com.cn 8 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Package Information TO-92 www.estek.com.cn 9 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Package Information SOT-89 www.estek.com.cn 10 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011 ET432 Package Information SOT-23-5 www.estek.com.cn 11 Copyright @ Estek Electronics Co., Ltd Version 0.1 12 Oct 2011