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FAN431/FAN431A/FAN431L
Programmable Shunt Regulator
Features
• • • • Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance 0.20 Typical Sink Current Capability of 1.0 to 100mA Equivalent Full-Range Temperature Coefficient of 50ppm/°C Typical • Temperature Compensated for Operation Over Full Rated Operating Temperature Range • Low Output Noise Voltage • Fast Turn-on Response
Description
The FAN431/FAN431A/FAN431L are three terminal output adjustable regulators with thermal stability over operating temperature range. The output voltage can be set any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors. These devices have a typical dynamic output impedance of 0.2Ω Active output circuit provides a sharp turn-on characteristic, making these devices excellent replacement for Zener Diodes in many applications.
TO-92
1
1. Ref 2. Anode 3. Cathode
Internal Block Diagram
REFERENCE
CATHODE
2.5 Vref
ANODE CATHODE (K)
REFERENCE (R)
ANODE(A)
Rev. 1.0.1
©2003 Fairchild Semiconductor Corporation
FAN431/FAN431A/FAN431L
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode current Range (Continuous) Reference Input Current Range Thermal Resistance Junction-Air (Note1,2) Z Suffix Package Power Dissipation (Note3,4) Z Suffix Package Junction Temperature Operating Temperature Range Storage Temperature Range
Note: 1. Thermal resistance test board
Symbol VKA IKA IREF RθJA PD TJ TOPR TSTG
Value 37 -100 ~ +150 -0.05 ~ +10 132 940 150 -25 ~ +85 -65 ~ +150
Unit V mA mA °C/W mW °C °C °C
Size: 76.2mm * 114.3mm * 1.6mm (1S0P) JEDEC Standard: JESD51-3, JESD51-7
2. Assume no ambient airflow. 3. TJMAX = 150°C, Ratings apply to ambient temperature at 25°C 4. Power dissipation calculation: PD = (TJ - TA)/RθJA
Recommended Operating Conditions
Parameter Cathode Voltage Cathode Current Symbol VKA IKA Min. VREF 1.0 Typ. Max. 36 100 Unit V mA
2
FAN431/FAN431A/FAN431L
Electrical Characteristics
(TA = +25°C, unless otherwise specified) Parameter
Reference Input Voltage Deviation of Reference Input Voltage OverTemperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off -Stage Cathode Current Dynamic Impedance
Symbol
VREF
Conditions
VKA=VREF, IKA=10mA
FAN431
FAN431A
FAN431L
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
Unit
V
∆VREF/ ∆T
VKA=VREF, IKA=10mA TMIN≤TA≤TMAX
-
4.5
17
-
4.5
17
-
4.5
17
mV
∆VREF/ ∆VKA
IKA =10mA
∆VKA=10VVREF
-
-1.0
-2.7
-
-1.0
-2.7
-
-1.0
-2.7 mV/V
∆VKA=36V10V
IREF IKA=10mA, R1=10kΩ,R2=∞
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
-
1.5
4
-
1.5
4
-
1.5
4
µA
IKA=10mA, R1=10kΩ,R2=∞ ∆IREF/∆T TA =Full Range
-
0.4
1.2
-
0.4
1.2
-
0.4
1.2
µA
IKA(MIN).