WSL431

WSL431 Adjustable Precision Shunt Regulator Features • • • • • • • • Precise Reference Voltage to 2.505V Guaranteed 0.5%, 1% and 2% Reference Voltage Tolerance Sink Current Capability, 1mA to 100mA Quick Turn-on Adjustable Output Voltage, Vo = Vref to 20V Low Operational Cathode Current, 150μA Typical 0.1Ω Typical Output Impedance SOT-89 , TO-92 and SOT-23 Packages This device has a typical output impedance of o.1Ω. Active output circuitry provides a very sharp turn-on characteristic, making the WSL431 excellent replacements for zener diodes in many applications, including on-board Regulation and adjustable power supplies. Applications • • Linear Regulators Switching Power Supply REF ANODE CATHODE • Adjustable Power Supply General Description The WSL431 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 (2.505V) and 20V with two external resistors (see Figure 2). When used with a photocoupler, the WSL431 is an ideal voltage reference in isolated feedback circuits for 2.505V to 12V switching-mode power supplies. SOT-89 (Top View) TO-92 SOT-23 (Top View) Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. C) WSL431 Ordering Information WSL431-XP□N□ Elec. Grad 2: 0.5% Reference Voltage Tolerance 3: 1% Reference Voltage Tolerance 4: 2% Reference Voltage Tolerance Elec. Grade Package Code A: TO-92 C: SOT-23 N: SOT-89 Package Code N: No-Lead Product Symbol REF ANODE CATHODE Functional Diagram Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. C) WSL431 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) Rating 26 150 3 0 to 85 0 to 125 -65 to 150 260 Unit V mA mA ˚C ˚C ˚C ˚C Electrical Characteristics Symbol Parameter VKA=Vref, IK=10mA. TA = 25˚C (unless otherwise noted) Test Conditions Min. WSL431 Typ. Max. Unit Vref ΔVref/T ΔVref/ΔVKA Iref ΔIref/T IK(min) IK(off) Reference Voltage Drift over Temp. range Voltage Ration (open loop gain) Reference Current Reference Current Drift WSL431B WSL431C WSL431D TA=0 to 85°C*1 , I k =10mA. IK=10 mA, VKA=Vref to 20V*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=20V, Vref=0V*3 VKA=Vref, IK=1 mA to 100mA, f=1k Hz*1 2.4925 2.480 2.455 2.505 2.5175 2.505 2.530 2.505 2.555 4 20 - 1.6 0.4 0.4 3.5 1.2 mV mV/ V µA µA -4 zKA Notes: *1 Min. Cathode Current Off-state Cathode Current Dynamic Impedance -0.4 0.15 0.1 -0.1 0.4 1 mA µA Ω : use Figure 1 *2: use Figure 2 *3: use Figure 3 Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, Jan. 2000 (Rev. C) WSL431 Test figures Figure 1. Test Circuit for VKA=VREF VO=VKA =VREF Figure 2. Test Circuit for VKA