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TA76L431FB
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA76L431FB
2.495 V Adjustable High-Precision Shunt Regulators
These devices are adjustable high-precision shunt regulators whose output voltage (VKA) can be set arbitrarily using two external resistors. The devices have a precise internal reference voltage of 2.495 V, enabling them to operate at low voltage. In addition, they can be used as zener diodes to perform temperature compensation.
Features
* * * * Precision reference voltage : VREF = 2.495 V 1.0% (Ta = 25C) Adjustable output voltage: VREF VOUT 19 V Minimum cathode current for regulation: Ikmin = 0.5 mA (max) Packages: Surface-mount S-Mini
SOP3-P-0302-0.95
Weight: 0.012 g (typ.)
Pin Assignment/Marking
3 1: Cathode (K) 2: Reference (REF) 3: Anode (A)
1F
1
2
How to Order
Product No. TA76L431FB(TE85L,F) Package S-Mini Packing Type and Capacity Embossed tape: 3000 pcs/real
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Functional Block Diagram
Cathode (K) Cathode (K) Reference (REF) Reference (REF)
Circuit Symbol
2.495 V Anode (A) Anode (A)
Typical Application Circuits
(1) 2.495 V Reference (VKA = VREF) (2) Shunt Regulator (VKA > VREF)
VIN VIN VOUT = 2.495 V R2 R1 IREF VREF VOUT
R1 + IREF * R1 V OUT = V REF 1 + R2
Precautions During Use
1. TA76L431FB These products contain MOS elements. Please take care to avoid generating static electricity when handling these devices. 2. TA76L431FB The oscillation frequency of these devices is determined by the value of the capacitor connected between the anode and the cathode. When establishing maximum operating condition parameters, please derate the absolute maximum rating values specified in these datasheets so as to allow an operational safety margin. Use of a laminated ceramic capacitor is recommended
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Absolute Maximum Ratings (Ta = 25C)
Characteristics Cathode voltage Cathode current Cathode-anode reverse current Reference voltage Reference current Reference-anode reverse current Power dissipation Thermal resistance Operating junction temperature Junction temperature Storage temperature Symbol VKA IK -IK VREF IREF -IREF PD Rth Tjopr Tj Tstg Rating 20 50 50 7 50 10 200 (Note 1) 625 (Note 1) -40~150 150 -55~150 Unit V mA mA V A mA mW C/W C C C
Note 1: Glass epoxy substrate mounting: 30 mm x 30 mm x 0.8 mmt (Cu pad area 35 mm2) Note 2: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook ("Handling Precautions"/Derating Concept and Methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc).
Operating Ranges
Characteristics Cathode voltage Cathode current Symbol VKA IK Min VREF 0.5 Typ. Max 19 40 Unit V mA
Electrical Characteristics (Unless otherwise specified, Ta = 25C, IK = 10 mA)
Characteristics Reference voltage Deviation of reference input voltage over temperature Ratio of change in reference input voltage to the change in cathode voltage Reference input current Deviation of reference input current over temperature Minimum cathode current for regulation Off-State cathode current Dynamic impedance Symbol VREF VREF (dev) VREF/V IREF IREF (dev) IKmin IKoff ZKA VKA = VREF 0C < Ta < 70C, VKA = VREF = = VREF < VKA < 10 V = = 10 V < VKA < 19 V = = VKA = VREF 0C < Ta < 70C, VKA = VREF, = = R1 = 10 k, R2 = VKA = VREF VKA = 19 V, VREF = 0 V VKA = VREF, f < 1 kHz, = 0.5 mA < IK < 40 mA == Test Condition Min 2.470 Typ. 2.495 8 0.8 0.8 0.6 0.3 0.2 0.2 Max 2.520 18 2.4 2.0 3 1.2 0.5 1.0 0.5 Unit V mV mV/V A A mA A
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Precaution on Application
Tj = 25C in the measurement conditions of each item is a regulation for where a pulse test is carried out and any drift in the electrical characteristic due to a rise in the junction temperature of the chip may be disregarded. The deviation parameters VREF (dev) and IREF (dev) are defined as the maximum variation of the VREF and IREF over the rated temperature range (Ta = 0 to 70C). The average temperature coefficient of the VREF is defined as:
VREF max VREF (dev) min
6 V REF (dev) x 10 V REF @25C VREF = Ta
(ppm C )
Ta
Application Circuit Example
Error amplification circuit for switching power supply VOUT
Photocoupler
GND Shunt regulator
This circuit amplifies the difference between the switching power supply's secondary output voltage and the shunt regulator's reference voltage. It then feeds the amplified voltage back to the primary input voltage via the photocoupler.
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PDmax - Ta
0.6 50 TA76L431FB Input
IK - VKA
VKA IK VKA = VREF 10 Ta = 25C
(W) Allowable power dissipation PDmax
0.5
0.4
0.3 Single
Cathode current
IK
(mA)
30
-10 85C -30
0.2
0.1
25C Ta = -40C
0 0
20
40
60
80
100
120
140
160
-50
-1
0
1
2
3
Ambient temperature Ta (C)
Cathode voltage
VKA
(V)
IK - VKA
600 Input IK VKA 2.53
VREF - Ta
VKA = VREF VKA Input VREF IK
400 VKA = VREF Ta = 25C 200 IK min 85C 0 85C 25C Ta = -40C -200 -1 -0 1 2 3 Ta = -40C 25C
Reference voltage VREF (V)
IK = 10 mA 2.51
Cathode current
IK
(A)
2.49
2.47
2.45 -50
0
50
100
150
Cathode voltage
VKA
(V)
Ambient temperature Ta (C)
VREF - VKA
2.53 0
Change in reference voltage VREF (mV)
VKA = VREF IK = 10 mA -10 2.51 -20 2.49 -30 V 2.47 REF -40 R1 Input VKA IK
VKA Inpu VREF IK
R2
IK = 10 mA Ta = 25C
-50 2.45 0 -50
5
0
10
50 15
20 100
25
Cathode voltage
VKA
(V)
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IREF - Ta
1.0 1.2 100 50 220 IK eo RS
ZKA - f
eo = ei KA Z RS + ZKA ei KA Z RS
ZKA ()
IREF (A)
1.0 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 Input Input 10k 10 k IK VKA
30
RS ZKA eo =
10 5 GND
ei
Reference current
Dynamic impedance
e ZKA = o S R ei
3 Ta = 25C VKA = VREF 0.5 mA < -IK < 50 mA = = 1 0.5 0.3 0.1 1k
IREF IK = 10 mA
0 0 -50
0
50
100
150
10 k
100 k
1M
10 M
Ambient temperature Ta (C)
Frequency f
(Hz)
AV - f
60 10 k 220 IK VOUT 5 0
Pulse response
Input Input monitor Pulse Generator f = 100 kHz GND 3 2 1 0 Output 50 4 220 Output
AV (dB)
50
10 F VIN
GND
Open loop voltage gain
30
IK = 10 mA Ta = 25C
20
10
0 1k
10 k
100 k
1M
10 M
Voltage swing (V)
40
10 k
0
1
2
3
5
6
Frequency f
(Hz)
Time t (s)
Stability Boundaty Conditions
50
(mA)
40
IK CL
IK Cathode current
30 Unstable 20 Stable Ta = 25C
VKA = VREF(2.495 V)~15 V
10
0 0.0001
0.001
0.01
0.1
1
10
100
Load capacitance CL (F)
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Package Dimensions
SOP3-P-0302-0.95
Weight: 0.012 g (typ.)
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RESTRICTIONS ON PRODUCT USE
* The information contained herein is subject to change without notice.
20070701-EN
* TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer's own risk. * The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties. * Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations.
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