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| 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, 42A Typical 0.1 Typical Output Impedance TO-92 and SOT-23 Package This device has a typical output impedance of 0.1. 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 an ideal voltage reference in isolated feedback circuits for 1.24V to 6V switching-mode power supplies. TO-92 SOT-23 (Top View) Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. A) WSL432 Ordering Information WSL432-XP Elect. Grade Package Code Elect. Grade 3: 1% Reference Voltage Tolerance 5: 1.5% Reference Voltage Tolerance 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. (c)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) Rating 7 30 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 = 25C (unless otherwise noted) Test Conditions Min. WSL432 Typ. Max. Unit 1.252 1.258 20 2.7 0.5 0.4 1.2 V V mV mV/ V A uA A Vref Vref/T Vref /VKA Iref Iref(dev) Iref/T IK(min) IK(off) Reference Voltage Drift over Temp. range Voltage Ration (open loop gain) Reference Current WSL432 (1%) WSL432 (1.5%) TA=0 to 85C*1 , I k =10mA. IK=10 mA, VKA=Vref to 6V*2 IK=10mA, R1=10K, R2=open*2 IK=10mA, R1=10K, R2=open*2 IK=10 mA, R1=10K, R2=open, TA=0 to 85C*2 VKA=Vref*1 VKA=6V, Vref=0V*3 VKA=Vref, IK=0.1 mA to 20mA, f=1k Hz*1 1.228 1.222 1.24 1.24 4 0.8 0.15 0.1 0.4 Iref deviation Reference Current Drift zKA Notes: *1: Min. Cathode Current Off-state Cathode Current Dynamic Impedance 42 0.001 0.1 80 0.1 0.4 uA A use Figure 1 *2: use Figure 2 *3: use Figure 3 Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. A) WSL432 Test figures Figure 1. Test Circuit for VKA=VREF VO=VKA =VREF Figure 2. Test Circuit for VKA Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. A) WSL432 TYPICAL CHARACTERISTICS Vref. vs Free-Air Temperature 1.26 Vref.(V) Iref.(uA) Iref. vs Free-Air Temperature 0.25 1.25 1.24 1.23 1.22 0 50 100 150 1.250V 1.241V 1.277V 0.2 0.15 0.1 0.05 0 0 20 40 60 80 100 120 Ik(off) vs. Free-Air Temperature 0.15 Ik(off) - (uA) Ratio of Delta Vref to Delta Vk vs Temperature 0.0015 dVref/dVk(mV/V) 0.1 0.05 0 -0.05 0 20 40 60 80 100 120 0.001 0.0005 0 0 20 40 60 80 100 120 Cathode Current vs Cathode Voltage 10 5 Ik(mA) 0 -1 -0.5 -5 0 -10 -15 Vka(V) 0.5 1 1.5 Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. A) WSL432 Application schematics Figure 4. Figure 5. Figure 6. Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. A) WSL432 Figure 7. Figure 8. Figure 9. Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. A) |
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