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 Switching Power Supply • Adjustable 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. ©Winson, Jan. 2000 (Rev. A)
WSL432
Ordering Information
WSL432-XP□N□ Elect. Grade Package Code N: No-Lead Product 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. ©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 = 25˚C (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 µA uA µA
Vref ΔVref/T ΔVref /ΔVKA Iref Iref(dev) ΔIref/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 85°C*1 , I k =10mA. IK=10 mA, VKA=Vref to 6V*2 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
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 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. A)
WSL432
Test figures
Figure 1. Test Circuit for VKA=VREF VO=VKA =VREF
Figure 2. Test Circuit for VKA
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