Adjustable Precision. A1semi. Electronics Ltd. Shunt Regulator AS431. Features: General Description: Applications: AS431Ver

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Rafe Benson
5 years ago
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1 General Description: The series ICs are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range.these ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger and other adjustable regulators. The series ICs contain two voltage types, 36V and 18V. The output voltage of both types can be set to any value between V REF (2.V) and the corresponding maximum cathode voltage. The precision reference is offered in three bandgap tolerance: 0.%, 1% and 2%. The 4 main packages have low thermal impedance which allows operation over a wide range of -40 o Cto 12 o C. Features: C Programmable precise output voltage from 2.V to 36V C Temperature compensated for operation over a full temperature range C Low dynamic output resistance with 0.2Ω typical value C Sink current capacity from 1mA to 100 ma C Low equivalent full-range temperature coefficient with 30PPM maximum C Low output noise C Available in packages: TO-92, SOT-23,SOIC-8, SOT-23- Applications: C C C C C Precision Voltage Reference Switching Power Supply Charger Voltage Adapter Adjusted Power Supply SOIC-8 SOT-23-3 SOT23- TO-92 Figure 1. Package types of Ver

2 Pin Configuration: D Package (SOIC-8) N Package M Package M Package (TO-92) (SOT-23-3) (SOT-23-) &$7+2'( 1& 1& 1& () 1& $12'( 1& &$7+2'( $12'( () $12'( () &DWKRGH Anode REF NC NC Cathode Top View Figure 2: Package types of Functional Block Diagram: Figure 3. Functional Block Diagram of Ver

3 Absolute Maximum Ratings: (Operation temperature range applies unless otherwise specified.) Parameter Symbol Value Unit Cathode Voltage V KA 37 V Cathode Current Range (Continuous) I KA -100 ~ +10 ma Reference Input Current Range I REF 10 ma Power Dissipation D,NPackage M Package P D Operating Temperature Range T OPR -40 ~ +12 o C Storage Temperature Range T STG -6~+10 o C mw mw Pacakge Thermal Impedance D Pacakge M Package N Package Q JA o C/W Note: Stresses greater than those listed under maximum ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended Operation Ratings: Parameter Symbol Min. Max. Unit Cathode Voltage V KA V REF V (36V):36 (18V): 18 Cathode Current I KA ma Operating Ambien Temperature Range o C Ver

4 Electrical Characteristics: (Typical and limits appearing in normal tape apply for T J =2 o C unless otherwise noted.) Parameter Reference Voltage Deviation of Reference Voltage Over- Temperature Ratio of Change in Reference Voltage to the Change in Cathode Voltage Test Symbol Conditions (36V) (18V) Unit Circuit Min. Typ. Max. Min. Typ. Max. 0.% 4 V REF V KA =V REF V 1% 1 KA =10mA % V REF V KA =V REF mv I KA =10mA V REF V KA I KA = 10mA T A =-40 o Cto12 o C V KA = mv/v 10V-V REF ΑS431(36V): V KA =36V-10V ΑS431(18V): V KA =18V-10V Reference Current I REF I KA =10mA, R1=10kΩ, R2= Deviation of Reference I REF I KA =10mA, Current Over R1=10KΩ,R2= Full Temperature Range TA=-40 o C to 12 o C Minimum Cathode Current for Regulation Off-Stage Cathode Current 4 I KA (MIN) 6 I KA (OFF) µ A µ A V KA =V REF ma (36V):V KA =36V, V REF =0 (18V): V KA =18V, V REF =0 Dynamic Impedance 4 Z KA V KA =V REF, I KA =1 to 100mA f 1.0kHz µ A µ A Ω Ver

5 ',1 '.$,.$ 9 () Figure 4. Test Circuit for V KA =V ref 9,1 9.$,.$, () 9 () 9.$ 9 () ГГÛ, () Û[Û Figure. Test Circuit for V KA >V ref 9,1 9.$, 2)) Figure 6. Test Circuit for I OFF Ver1.3

6 Typical Characteristics: Reference Voltage (V) V KA =V REF I KA =10 ma Reference Current (µa) !S 2 >21L-S 3 >α!!j LB >21nB Ambient Temperature ( o C) Ambient Temperature ( 0 C) Figure 7. Reference Voltage VS. Ambient Temperature Figure 8. Reference Current VS. Ambient Temperature Cathode Current (ma) V KA =V REF T KA =2 0 C Cathode Current (µa) V KA =V REF T KA =2 0 C Cathode Voltage (V) Cathode Voltage (V) Figure 9. Cathode Current VS. Cathode Voltage Figure 10. Current VS. cathode Voltage Ver

7 Figure 11. Off-state Cathode Current VS. Ambient Temperature Figure 12. Ratio of Delta Reference Voltage to the Ratio of Cathode Voltage 1K 10K 100K 1000K T A =2 o C I KA = 10mA uF IKA 1K 242 Output Av (db) k k 10k 100k 1000k Small signal frequency 10 0 GND Figure 13. Small Signal Voltage Gain VS. Frequency Ver

8 1k Output JLB 0 GND Figure 14. Reference Impedance VS. Frequency IKA 10 VB CL R1 (10K) IKA 10 R2 Figure 1. Stability Boundary Conditions VS. Load Capacitance Ver

9 Pulse Generator f=100khz Outpu GND Figure 16. Pulse Response of Input and Output Voltage Typical Application: ,1 ÛÛà 9 () $S V O =(1+R1/R2) V REF ÛÛà Figure 17: Ver

10 9, V O =(1+R2/R3) V REF 9 () $S Figure 18: High Current 9,1, RXW I OUT =V REF /R2 + I KA $S Figure19: Current Source or Current Limit $S 9, $GMXVW 9$.Ω ΑS431 Ω Ω Figure20: Precision -V 1.A Regulator C1 R2 680 R3 R4 R1 COMP PWM Controller VFB U1 3 4 U2 PS21 C2 2 1 Q1 R R6 Vo Figure 21: PWM Converter with Reference Ver

11 TO ± ± Φ Φ4.± ± ± Ver

12 TO92 (TAPE AMMO PACK).0. ±1 ±1 4.0 ± ±0 0. ±0 ±0 Φ4. ±0. ± ±. ± SOT ± ± ± ± R0.10 R ± ± ± ±0.0 Ver

13 SOIC ± ± ± ± ±0.02 D 6.00± D 20:1 φ ±0.10 R0.1 4 ±4 0.42± ±2 R0.1 Ver

14 SOT MAX 0.9 REF 2.90 BSC (NOTE 4) 1.22 REF 3.8 MAX 2.62 REF 1.4 MIN 2.80 BSC (NOTE 4) PIN ONE RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.9 BSC TYP PLCS (NOTE 3) BSC DATUM A 1.00 MAX : REF BSC (NOTE 3) S TSOT Ver

15 ORDER INFORMATION Part Number Package Accuracy Vka(V) Packing Green N-LF TO-92 1% 18 Buck MPQ=1K AN-LF TO-92 0.% 18 Buck MPQ=1K N/AP-LF TO-92 1% 18 Tape Ammo Pack MPQ=2K AN/AP-LF TO-92 0.% 18 Tape Ammo Pack MPQ=2K HN-LF TO-92 1% 36 Buck MPQ=1K AHN-LF TO-92 0.% 36 Buck MPQ=1K HN/AP-LF TO-92 1% 36 AHN/AP-LF TO-92 0.% 36 M/TR-LF SOT23-3 1% 18 AM/TR-LF SOT % 18 HM/TR-LF SOT23-3 1% 36 AHM/TR-LF SOT % 36 M/TR-LF SOT23-1% 18 AM/TR-LF SOT23-0.% 18 HM/TR-LF SOT23-1% 36 AHM/TR-LF SOT23-0.% 36 Tape Ammo Pack MPQ=2K Tape Ammo Pack MPQ=2K Notice:LF:,HF:Halogen-Free cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a product. reserves the right to change the circuitry and specifications without notice at any time. Ver

ADJUSTABLE PRECISION SHUNT REGULATORS General Description. Features. Applications

ADJUSTABLE PRECISION SHUNT REGULATORS General Description. Features. Applications General Description The series ICs are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature