TL432/ A / C Low Voltage(1.24V) Adjustable Precision Shunt Regulator PROGRAMMABLE PRECISION REFERENCES The TL432A is a three-terminal Shunt Voltage Reference providing a highly accurace 1.24 V, 1.25V bandgap reference with 1.0 % tolerance. The TL432A thermal stability and wide operating current (100mA), makes is suitable for all variety of applications that are looking for a low cost solution with high performance. The TL432A is an ideal voltage reference in an isolated feed circuit for 3.0V to 3.3V switching mode power supplies. TO-92 (Top View) 3.Cathode 2.Anode 1.Reference SOT-23 (Front View) 2.Anode FEATURES Low Voltage Operation : 1.24 V Programmable Out Voltage to 15V ● Sink Current Capability of 1 mA to 100 mA ● Equivalent Full-Range Temperature Coefficient of 50 ppm/℃ ● Temperature Compensated for Operation over Full Rated Operating Temperature Range ● Trimmed Bandgap to 5% ● ESD Protection : 2kV ● ● APPLICATION Shunt Regulator Voltage Monitoring ● Current Source and Sink Circuits ● Anolog and Digital Circuits Requiring Precision References ● Low Out Voltage (3.0V to 3.3V) Switching Power Supply Error Amplifier ● ● 1.Reference 3.Cathode ORDERING INFORMATION Device Marking Package TL432-A TL432-C TL432-ASF TL432-CSF TL432-A TL432-C TO-92 432 SOT-23 FUNCTION BLOCK DIAGRAM CATHODE(K) CATHODE REFERENCE + REFERENCE(R) 1.24VREF ANODE(A) ANODE HTC Jan, 2004 - Rev 01 21 TL432/ A / C Low Voltage(1.24V) Adjustable Precision Shunt Regulator EQUIVALENT SCHEMATIC All component values are nominal RECOMMENDED OPERATING CONDITIONS CHARACTERISTIC SYMBOL VKA IK Cathode Voltage Cathode Current MIN. VREF 1 MAX. UNIT 15 100 V ㎃ DISSIPATION RATING TABLE1-FREE-AIR TEMPERATURE Package TO-92 SOT-89 SOT-23 TA=25℃ Power Rating 770㎽ 230㎽ Derating Factor Above TA=25℃ 6.2㎽/℃ 1.8㎽/℃ TA=70℃ TA=85℃ TA=125℃ Power Rating Power Rating Power Rating 491㎽ 398㎽ 149㎽ 122㎽ HTC Jan, 2004 - Rev 01 22 TL432/ A / C Low Voltage(1.24V) Adjustable Precision Shunt Regulator ABSOLUTE MAXIMUM RATINGS (Full Operating Ambient Temperature Range Applies Unless Otherwise Noted) CHARACTERISTIC SYMBOL RATING UNIT Cathode Voltage VKA 15 V Continuous Cathode Current Range IKA 100 ㎃ Reference Input Current Range IREF -0.05 ~ 3 ㎃ Junction Temperature TJ -40 ~ 150 ℃ Operating Temperature TOPR 0 ~70 ℃ Storage Temperature TSTG -65~+150 ℃ Total Power Dissipation PD 770 ㎽ (TA=25℃, unless otherwise specified) TL432A/C ELECTRICAL CHARACTERISTICS CHARACTERISTIC Reference Input Voltage SYMBOL VREF VKA=VREF, IK=10㎃ TL432A TL432C MIN. TYP. 1.228 MAX. UNIT 1.252 1.24 1.233 V 1.247 VKA=VREF, IK=10㎃ Deviation of Reference Input Voltage Over TEST CONDITION ΔVREF/ΔT TA=Full Range 10 25 ㎷ 1.0 2.7 ㎷/V Full Temperature Range Ratio of Change in Reference Input Voltage ΔVREF/ΔVKA to the Change in Cathod VKA=1.25V to 14.5V Voltage Reference Input Current IREF R1=10㏀, R2=∞ 0.5 1 ㎂ ΔIREF/ΔT R1=10㏀, R2=∞, Ta = Full Range 0.05 0.3 ㎂ 60 80 ㎂ Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance IKAMIN Vka=Vref IKAOFF VKA=15V, V REF=0 0.04 0.5 ㎂ ZKA VKA=VREF, IK=0.1㎃~20㎃, f≤1.0㎑ 0.2 0.4 Ω HTC 23 TL432/ A / C Low Voltage(1.24V) Adjustable Precision Shunt Regulator Fig. 1 Test Circuit for V INPUT KA =V REF Fig. 2 Test Circuit for V VKA IKA INPUT R1 DUT VREF R2 1 uF KA ≥V REF VKA IKA ＩREF DUT VREF VKA=VREF(1+R1/R2)+IREF R1 Fig. ３ Test Circuit for IKA （off) VKA INPUT IKA(OFF) DUT HTC Jan, 2004 - Rev 01 24 Low Voltage(1.24V) Adjustable Precision Shunt Regulator TL432/ A / C The deviation parameters V REF(DEV) and IREF(DEF) are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage, αV REF, is defined as : Maximum V REF V I(dev) 6 （ ）x10 ｜αVREF｜（ ppm ）= VREF at 25℃ ℃ ΔTA VI(dev) Minimum V REF ΔTA Where : ΔTA is the recommended operating free-air temperature range of the device. αVREF can be positive or negative, depending on whether minimum V REF or maximum V REF, respectively, occurs at the lower temperature. Example : Maximum V REF=1190㎷ at 30℃, maximum VREF=1262㎷ at 0℃, VREF=1241㎷ at 25℃, ΔTA=125℃ for TL431C ｜αVREF｜= （ 7.2㎷ 6 ）x10 ~ 1241㎷ ~ 46PPM/℃ 125℃ Because minimum V REF occurs at the lower temperature, the coefficient is positive. Calculating Dynamic Impedance ｜ZKA｜= ΔVKA ΔIKA The dynamic impedance is defined as : When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit is given by : ｜Z'｜= ΔV ΔI ~｜ZKA｜ （1+ R1 ） ~ R2 HTC Jan, 2004 - Rev 01 25