WSL432 Adjustable Precision Shunt Regulator Features • • • • • • • • Precise Reference Voltage to 1.240V Guaranteed 1% and 1.5% Reference Voltage Tolerance Sink Current Capability, 0.1mA to 20mA Quick Turn-on Adjustable Output Voltage, Vo = Vref to 6V Low Operational Cathode Current, 42µA Typical 0.1Ω Typical Output Impedance TO-92 and SOT-23 Package This device has a typical output impedance of 0.1Ω. Active output circuitry provides a very sharp turn-on characteristic, making the WSL432 excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies. Applications • Linear Regulators • Adjustable Power Supply • Switching Power Supply General Description The WSL432 is a 3 terminal adjustable voltage reference with specified thermal stability over applicable commercial temperature ranges. Output voltage may be set to any value between Vref (1.24V) and 6V with two external resistors (see Figure 2). When used with a photo-coupler, the WSL432 is TO-92 an ideal voltage reference in isolated feedback circuits for 1.24V to 6V switching-mode power supplies. SOT-23 (Top View) Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) WSL432 Ordering Information Elect. Grade WSL432-XP□ □ 3: 1% Reference Voltage Tolerance Elect. Grade 5: 1.5% Reference Voltage Tolerance Package Code Package Code A: TO-92 C: SOT-23 Symbol REF ANODE CATHODE Functional Diagram Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) WSL432 Absolute Maximum Ratings Symbol VKA IK Iref TA TJ TSTG TSO Parameter Cathode voltage Continuous cathode current range Reference current range Ambient temperature range Junction temperature range Storage Temperature Range Lead temperature range, Ts (Soldering, 10sec) Electrical Characteristics Symbol Vref VKA=Vref, IK=10mA. ∆Vref/T Iref Reference Voltage Drift over Temp. range Voltage Ration (open loop gain) Reference Current Iref(dev) Iref deviation ∆Iref/T Reference Current Drift IK(min) IK(off) Min. Cathode Current Off-state Cathode Current Dynamic Impedance zKA Notes: Test Conditions WSL432 Unit Min. Typ. Max. 1.228 1.222 1.24 1.24 4 1.252 1.258 20 V V mV IK=10 mA, VKA=Vref to 6V*2 0.8 2.7 IK=10mA, R1=10KΩ, R2=open*2 IK=10mA, R1=10KΩ, R2=open*2 IK=10 mA, R1=10KΩ, R2=open, TA=0 to 85°C*2 VKA=Vref*1 VKA=6V, Vref=0V*3 VKA=Vref, IK=0.1 mA to 20mA, f=1k Hz*1 0.15 0.5 mV/ V µA 0.1 0.4 uA 0.4 1.2 µA 42 0.001 0.1 80 0.1 0.4 uA µA Ω WSL432 (1%) WSL432 (1.5%) TA=0 to 85°C*1 , I k =10mA. : use Figure 1 *2: use Figure 2 *3: use Figure 3 *1 Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) Unit V mA mA ˚C ˚C ˚C ˚C TA = 25˚C (unless otherwise noted) Parameter ∆Vref /∆VKA Rating 7 30 3 0 to 85 0 to 125 -65 to 150 260 WSL432 Test figures Figure 1. Test Circuit for VKA=VREF VO=VKA =VREF Figure 2. Test Circuit for VKA<VREF, VO=VKA=VREF×(1+R1/R2)+IREF×R1 Figure 3. Test Circuit for Ik(off) Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) WSL432 TYPICAL CHARACTERISTICS Vref. vs Free-Air Temperature Iref. vs Free-Air Temperature 0.25 1.25 0.2 1.250V 1.241V 1.277V 1.24 1.23 Iref.(uA) Vref.(V) 1.26 0.15 0.1 0.05 0 1.22 0 50 100 0 150 20 40 100 Ratio of Delta Vref to Delta Vk vs Temperature Ik(off) vs. Free-Air Temperature 0.0015 dVref/dVk(mV/V) 0.15 Ik(off) - (uA) 80 ℃ ℃ 0.1 0.05 0 -0.05 60 0 20 40 60 80 100 0.001 0.0005 0 120 0 20 40 60 ℃ ℃ Cathode Current vs Cathode Voltage 10 Ik(mA) 5 0 -1 -0.5 -5 0 0.5 1 1.5 -10 -15 Vka(V) Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) 80 100 120 120 WSL432 Application schematics Figure 4. Figure 5. Figure 6. Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) WSL432 Figure 7. Figure 8. Figure 9. Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. A) WWW.ALLDATASHEET.COM Copyright © Each Manufacturing Company. All Datasheets cannot be modified without permission. This datasheet has been download from : www.AllDataSheet.com 100% Free DataSheet Search Site. Free Download. No Register. Fast Search System. www.AllDataSheet.com