B431LBK3 [ETC]
1.24V Adjustable Shunt Regulator; 1.24V可调并联稳压器
| 型号： | B431LBK3 |
| 厂家： | 
ETC |
| 描述： | 1.24V Adjustable Shunt Regulator |
| 文件： | 总8页 (文件大小：285K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Bay Linear
Inspire the Linear Power
1.24V Adjustable Shunt Regulator
B431L
Description
Features
The B431L is a three terminal adjustable shunt regulator with
thermal stability of 50ppm/°C. The output voltage can be
adjusted to any value from 1.24V (VREF) to 16V with two
•
•
•
•
•
Low voltage operation (down to 1.24V)
Wide operating current……80µA to 100mA
Trimmed bandgap design………….. ± 0.5%
Low Dynamic Output Impedance…....0.05Ω
Wide temperature range…... -40°C to +85°C
external resistors. These devices have
a typical output
impedance of 0.05Ω. Active output circuitry provides a very
sharp turn-on characteristics and making the device excellent
replacement for zener diodes in many applications. The B431L
is an ideal voltage reference in an isolated feedback circuit for
3.0V switch mode power supplies
•
•
Available in ….….SOT-23-3, TO-92 , 8SOIC
Pin-to-Pin Replacement …………….SC431L
The B431L shunt regulator is available with three voltage
tolerances (0.5%, 1.0% and 2.0%) and three package options
(SOT-23-3, TO-92, 8SOIC). This allows the designer the
opportunity to select the optimum combination of cost and
performance for their application.
Applications
•
•
•
•
•
•
Switching Power Supplies
Adjustable Power Supplies
Linear Regulators
Battery Powered Equipment
Monitors, TV, VCR
Instrumentation
Pin Connection
Ordering Information
Package
Tolerance
1%
0.5%
2%
TO-92
SO-8
B431LAZ
B431LBZ
B431LCZ
B431LAM B431LBM B431LCM
SOT-23 B431LAK3 B431LBK3 B431LCK3
SOT-23-3 (K3)
TO-92 (Z)
Anode
2
1
3
BAY
Ref
Cathode
Ref
Cathode
Anode
Top View
Bottom View
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Absolute Maximum Rating
Parameter
Cathode Voltage
Symbol
Maximum
Units
V
Vz
Iz
20
100
3
Continuous Cathode Current
Reference Input Current Range
Power Dissipation at TA - 25°C
SOT-23-3
mA
mA
PD
0.37
0.75
0.95
W
S0-8
TO-92
Thermal Resistance
SOT-23-3
OJA
336
175
°C/W
S0-8
TO-92
132
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 seconds
ESD Rating (Human Body Model)
TJ
-40 to +150
-65 to +150
300
°C
°C
°C
kV
TSTG
TLEAD
TESD
2
Recommended Operating Conditions
Min
VREF
80µA
Max Symbol
Cathode Voltage, Vz
Cathode Current, Iz
16
V
100
mA
Electrical Characteristics
Unless specified: T
٨
= 25°C. Values in bold apply over full operating ambient temperature. B431LA 0.5%
Parameter
Reference Voltage
Symbol
VREF
Condition
Min
1.234
Typ
1.240
Max
1.246
Units
V
VZ = VREF1 IZ = 10mA(1)
1.222
1.258
VREF Temp Deviation VDEV
VZ = VREF1, IZ = 10mA(1)
IA=full range
IZ = 10mA,ΔVZ = 16V to VRef
(2)
10
25
mV
Ratio of Change in
Δ VREF
-2.7
-1.0
mV/V
VREF To Change in VZ
ΔVZ
Reference Input
Current
IREF
0.15
0.1
0.5
0.4
R1 = 10kΩ, R2 = ∞,
µA
µA
IZ = 10mA(2)
IREF Temperature
Deviation
IREF(DEV)
IZ (OFF)
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
Off-State Cathode
Current
0.125
0.135
20
0.150
0.150
80
VREF = 0V, VZ =16V(3)
VREF = 0V, VZ =16V(3)
µA
(1)
Min Operating
Current
Dynamic Impedance
IZ(MIN)
ZKA
VZ = VREF
µA
VKA=Vref,
0.05
0.15
Ω
IK=100µA to 100mA, f≤1kHA
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Electrical Characteristics
Unless specified: T
٨
= 25°C. Values in bold apply over full operating ambient temperature. B431LB 1%
Parameter
Reference Voltage
Symbol
VREF
Condition
Min
1.228
Typ
1.240
Max
1.252
Units
V
VZ = VREF1 IZ = 10mA(1)
1.215
1.265
VREF Temp Deviation VDEV
VZ = VREF1, IZ = 10mA(1)
IA=full range
IZ = 10mA,ΔVZ = 16V to VRef
(2)
10
25
mV
Ratio of Change in
Δ VREF
-1.0
-2.7
mV/V
VREF To Change in VZ
ΔVZ
Reference Input
Current
IREF
0.15
0.1
0.5
0.4
R1 = 10kΩ, R2 = ∞,
µA
µA
IZ = 10mA(2)
IREF Temperature
Deviation
IREF(DEV)
IZ (OFF)
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
Off-State Cathode
Current
VREF = 0V, VZ =16V(3)
0.125
0.135
20
0.150
0.150
80
µA
VREF = 0V, VZ =16V(3)
(1)
Min Operating
Current
Dynamic Impedance
IZ(MIN)
ZKA
VZ = VREF
µA
VKA=Vref,
0.05
0.15
Ω
IK=100µA to 100mA, f≤1kHA
Electrical Characteristics
Unless specified: T
٨
= 25°C. Values in bold apply over full operating ambient temperature. B431LC 2%
Parameter
Reference Voltage
Symbol
VREF
Condition
Min
1.215
Typ
1.240
Max
1.265
Units
V
VZ = VREF1 IZ = 10mA(1)
1.200
1.280
VREF Temp Deviation VDEV
VZ = VREF1, IZ = 10mA(1)
IA=full range
IZ = 10mA,ΔVZ = 16V to VRef
(2)
10
35
mV
Ratio of Change in
Δ VREF
-1.0
-2.7
mV/V
VREF To Change in VZ
ΔVZ
Reference Input
Current
IREF
0.15
0.1
0.5
0.4
R1 = 10kΩ, R2 = ∞,
µA
µA
IZ = 10mA(2)
IREF Temperature
Deviation
IREF(DEV)
IZ (OFF)
R1 = 10kΩ, R2 = ∞,
IZ = 10mA(2)
Off-State Cathode
Current
VREF = 0V, VZ =16V(3)
0.125
0.135
20
0.150
0.150
80
µA
VREF = 0V, VZ =16V(3)
(1)
Min Operating
Current
Dynamic Impedance
IZ(MIN)
ZKA
VZ = VREF
µA
VKA=Vref,
0.05
0.15
Ω
IK=100µA to 100mA, f≤1kHA
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Test Circuit: Small-Signal Gain & Phase
43
Test Circuit: Stability
431
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Application Notes:
Stability:
Selection of Load Capacitor
Selection of load capacitor for when B431L is used as a
shunt regulator, two options for selection of CL 1) No
load capacitance across the device, decouple at the load
2) Large capacitance across the device, optional
decoupling at the load.
The reason for this is that B431L exhibits instability
with capacitances in the range of 10nF to 1µF (approx.)
at light cathode currents (up to 3mA typical). The
device is less stable the lower the cathode voltage has
been set for. Therefore while the device will be
perfectly stable operating at a cathode current of 10mA
with a 0.1µF capacitor across it, it will oscillate
transiently during start-up as the cathode current passes
through the instability region. Selecting a very low (or
preferably, no) capacitance, or alternatively a high
capacitance such as 10µF will avoid this issue
altogether. Since the user anyway, the most cost
effective method is to use no capacitance at all directly
across the device. PCB trace/via resistance and
inductance prevent the local load decoupling from
causing the oscillation during the transient start-up
phase.
Note: if the B431L is located right at the load, so the
load decoupling capacitor is directly across it, then this
capacitor will have to be ≤1nF or ≥ 10µF
B431
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
Test Circuits:
Application Circuit:
+3.3V
0.1µF
470µF
PHD 3055E
+12V
500Ω
2.7V
Ω
140
0.1µF
0.1µF
0.1µF
INTEL
I 740
B431L
1000µF
Ω
120
*If the output voltage has noise, then please add a 0.1µF in between drain and gate of power MOSFET to
reduce the noise.
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B431L
SOT-23
0.015 - 0.018
(0.381 - 0.457)
0.047 - 0.055 0.083 - 0.098
(1.194 - 1.397) (2.108 - 2.489)
0.035 - 0.040
(0.889 - 1.016)
0.020 - 0.024
0.070 - 0.080
(0.508 - 0.610)
(1.778 - 2.032)
0.110 - 0.120
(2.794 - 3.048)
0.003 - 0.005
(0.076 - 0.127)
0.030 - 0.041
(0.762 - 1.041)
0.018 - 0.024
(0.457 - 0.610)
0.001 - 0.004
(0.025 - 0.102)
- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,
Advance Information
computer simulations and/ or initial prototype evaluation.
- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are
Preliminary Information
subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit
design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any
industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different
applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.
LIFE SUPPORT AND NUCLEAR POLICY
Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical
implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without
the specific written consent of Bay Linear President.
Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
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