ATL431AQDBZR [TI]
2.5V 低 IQ 可调节精密并联稳压器 | DBZ | 3 | -40 to 125;
| 型号： | ATL431AQDBZR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 2.5V 低 IQ 可调节精密并联稳压器 | DBZ | 3 | -40 to 125 稳压器 |
| 文件： | 总29页 (文件大小：1779K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
ATL43xx 2.5V 低静态电流可调节精密分流稳压器
1 特性
3 说明
1
•
•
可调节稳压输出：2.5V 至 36V
超低工作电流
ATL431 和 ATL432 为三引脚可调节分流稳压器，在适
用的汽车级、商业级和工业级温度范围内均可满足规定
的热稳定性。 这两款稳压器均可通过两个外部电阻将
输出电压设置为 Vref（约为 2.5V）至 36V 范围内的任
意值。 其输出阻抗典型值均为 0.05Ω。此类器件的有
源输出电路具有出色的导通特性，因此成为了许多应用
中齐纳二极管的绝佳替代产品，例如板载稳压器、可调
节电源和开关电源。
–
–
IKA(min) = 35µA（最大值）
IREF = 150nA（最大值）
•
•
内部补偿确保稳定性
无需容性负载即可保持稳定
25°C 温度下的基准电压容差
–
–
–
0.5% (ATL43xB)
1% (ATL43xA)
ATL43X 的阴极电流范围相比其上一代产品 TL43X 有
20 倍以上的提升。 另外稳定性也有所提高，可支持范
围更为宽泛的负载电容类型和容值。
•
温度漂移典型值
–
–
5mV（–40°C 至 85°C）；“I”版本
6mV（–40°C 至 125°C）；“Q”版本
ATL431 和 ATL432 这两款器件的功能完全相同，只是
引脚分配和订货编号有所不同。 ATL43X 提供 A 和 B
两个等级，25°C 温度下的初始容差分别为 1% 和
0.5%。 此外，这两款器件的输出温度漂移较低，可确
保在整个温度范围内保持出色的稳定性。
•
•
•
扩展级阴极电流范围：35µA 至 100mA
低输出阻抗：0.3Ω（最大值）
ATL431AQ、ATL431BI 和 ATL431BQ 目前均为预
览状态
•
ATL432AI、ATL432AQ、ATL432BI 和 ATL432BQ
目前均为预览状态
ATL43xxI 器件的额定工作温度范围为 –40°C 至
85°C；ATL43xxQ 器件的额定工作温度范围为 –40°C
至 125°C。
2 应用
•
•
•
•
•
•
反激式开关模式电源 (SMPS) 中的二次侧稳压
器件信息(1)
工业、计算、消费类和便携式产品
可调节电压和电流基准
电源管理
器件型号
ATL43x
封装
封装尺寸（标称值）
SOT (3)
2.90mm x 1.60mm
(1) 要了解所有可用封装，请见数据表末尾的可订购产品附录。
电源隔离
齐纳二极管替代产品
VKA = 15.0V 时的稳定区域
4 简化电路原理图
2000
Input
V
KA
1000
I
KA
STABLE
100
V
ref
20
0.0001
0.001
0.01
CKA(PF)
0.1
1
10
D001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
English Data Sheet: SLVSCV5
ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
目录
9.1 Overview ................................................................. 12
9.2 Functional Block Diagram ....................................... 12
9.3 Feature Description................................................. 12
9.4 Device Functional Modes........................................ 13
10 Applications and Implementation...................... 14
10.1 Application Information.......................................... 14
10.2 Typical Applications .............................................. 15
11 Power Supply Recommendations ..................... 20
12 Layout................................................................... 20
12.1 Layout Guidelines ................................................. 20
12.2 Layout Example .................................................... 20
13 器件和文档支持 ..................................................... 21
13.1 相关链接................................................................ 21
13.2 商标....................................................................... 21
13.3 静电放电警告......................................................... 21
13.4 术语表 ................................................................... 21
14 机械、封装和可订购信息....................................... 21
1
2
3
4
5
6
7
特性.......................................................................... 1
应用.......................................................................... 1
说明.......................................................................... 1
简化电路原理图........................................................ 1
修订历史记录 ........................................................... 2
Pin Configuration and Functions......................... 3
Specifications......................................................... 3
7.1 Absolute Maximum Ratings ..................................... 3
7.2 ESD Ratings.............................................................. 3
7.3 Thermal Information.................................................. 3
7.4 Recommended Operating Conditions....................... 4
7.5 Electrical Characteristics, ATL431Ax, ATL432Ax..... 4
7.6 Electrical Characteristics, ATL431Bx, ATL432Bx..... 4
7.7 Notes......................................................................... 5
7.8 Typical Characteristics.............................................. 6
Parameter Measurement Information ................ 10
Detailed Description ............................................ 12
8
9
5 修订历史记录
Changes from Original (March 2013) to Revision A
Page
•
最初发布的完整版文档。 ........................................................................................................................................................ 1
2
Copyright © 2015, Texas Instruments Incorporated
ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
6 Pin Configuration and Functions
ATL431A/%«..DBZ (SOT-23-3) Package
ATL432A/%«..DBZ (SOT-23-3) Package
(T OP VIEW)
(T OP VIEW)
CATHODE
REF
1
2
REF
1
ANODE
3
ANODE
3
CATHODE
2
Pin Functions
PIN
NO.
I/O
DESCRIPTION
NAME
ATL431x
ATL432x
CATHODE
REF
1
2
3
2
1
3
I/O
I
Shunt Current/Voltage input
Threshold relative to common anode
ANODE
O
Common pin, normally connected to ground
7 Specifications
7.1 Absolute Maximum Ratings(1)
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
40
UNIT
V
VKA
IKA
Cathode voltage(2)
Continuous cathode current range
Reference input current range
Operating virtual junction temperature
Storage temperature range
–100
–0.05
-40
150
10
mA
mA
°C
II(ref)
TJ
150
150
Tstg
–65
°C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to ANODE, unless otherwise noted.
7.2 ESD Ratings
VALUE
UNIT
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
±2000
V(ESD)
Electrostatic discharge
V
Charged-device model (CDM), per JEDEC specification JESD22-
C101(2)
±1000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.3 Thermal Information
ATL43xx
THERMAL METRIC(1)
DBZ
3 PINS
331.8
106.5
64.6
UNIT
θJA
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
θJCtop
θJB
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
ψJT
ψJB
Junction-to-top characterization parameter
Junction-to-board characterization parameter
4.9
62.9
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
Copyright © 2015, Texas Instruments Incorporated
3
ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
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7.4 Recommended Operating Conditions
MIN
Vref
MAX
UNIT
V
VKA
IKA
Cathode voltage
Cathode current
36
100
85
.035
–40
–40
mA
"I" Grade
TA
Operating free-air temperature
°C
"Q" Grade
125
7.5 Electrical Characteristics, ATL431Ax, ATL432Ax
over recommended operating conditions, TA = 25°C (unless otherwise noted)
TEST
ATL431Ax, ATL432Ax
PARAMETER
TEST CONDITIONS
UNIT
CIRCUIT
MIN
TYP
MAX
Vref
Reference voltage
图 23
VKA = Vref, IKA = 1 mA
2475
2500
2525
mV
ATL43XAI; TA = -
40°C to 85°C
5
6
15
34
Deviation of reference input
voltage over full temperature
range, see Notes section
VKA = Vref
IKA = 1 mA,
,
VI(dev)
图 23
mV
ATL43XAQ; TA = -
40°C to 125°C
Ratio of change in reference
voltage to the change in
cathode voltage
ΔVKA = 10 V − Vref
ΔVKA = 36 V − 10 V
–0.4
–0.1
30
–2.7
–2
ΔVref
ΔVKA
/
图 24
图 24
图 24
IKA = 1 mA
mV/V
nA
Iref
Reference input current
IKA = 1 mA, R1 = 10 kΩ, R2 = ∞
IKA = 1 mA, R1 = 10 kΩ, R2 = ∞
150
Deviation of reference input
current over full temperature
range, see Notes section
II(dev)
20
50
nA
Minimum cathode current for
regulation
图 23
图 6
Imin
Ioff
|zKA
VKA = Vref
20
0.05
0.05
35
0.2
0.3
µA
µA
Ω
Off-state cathode current
图 25
VKA = 36 V, Vref = 0
Dynamic impedance, see
Notes section
|
图 23
VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA
7.6 Electrical Characteristics, ATL431Bx, ATL432Bx
over recommended operating conditions, TA = 25°C (unless otherwise noted)
ATL431Bx, ATL432Bx
PARAMETER
TEST CIRCUIT
TEST CONDITIONS
UNIT
MIN
TYP
MAX
Vref
Reference voltage
图 23
VKA = Vref, IKA = 1 mA
2487
2500
2512
mV
ATL43XBI; TA
–40°C to 85°C
=
5
6
15
34
Deviation of reference input
voltage over full temperature
range, see Notes section
VKA = Vref, IKA = 1
mA
VI(dev)
图 23
mV
ATL43XBQ; TA
–40°C to 125°C
=
Ratio of change in reference
voltage to the change in
cathode voltage
ΔVKA = 10 V − Vref
ΔVKA = 36 V − 10 V
–0.4
–0.1
30
–2.7
–2
ΔVref
ΔVKA
/
图 24
图 24
图 24
IKA = 1 mA
mV/V
nA
Iref
Reference input current
IKA = 1 mA, R1 = 10 kΩ, R2 = ∞
IKA = 1 mA, R1 = 10 kΩ, R2 = ∞
150
Deviation of reference input
current over full temperature
range, see Notes section
II(dev)
20
50
nA
Minimum cathode current for
regulation
图 23
图 6
Imin
Ioff
|zKA
VKA = Vref
20
0.05
0.05
35
0.2
0.3
µA
µA
Ω
Off-state cathode current
图 25
VKA = 36 V, Vref = 0
Dynamic impedance, see
Notes section
|
图 23
VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA
4
版权 © 2015, Texas Instruments Incorporated
ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
7.7 Notes
The deviation parameters Vref(dev) and Iref(dev) are defined as the differences between the maximum and minimum
values obtained over the rated temperature range. The average full-range temperature coefficient of the
reference input voltage αVref is defined as:
αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the
lower temperature.
∆VKA
∆IKA
|zKA| =
The dynamic impedance is defined as:
When the device is operating with two external resistors (see 图 24), the total dynamic impedance of the circuit is
∆V
∆I
R1
R2
|z'| =
|z |
1 +
KA
(
given by:
which is approximately equal to
版权 © 2015, Texas Instruments Incorporated
5
ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
7.8 Typical Characteristics
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the
various devices.
0.04
0.032
0.024
0.016
0.008
0
2520
2515
2510
2505
2500
2495
2490
2485
2480
2475
Vref = 2485mV
Vref = 2500mV
Vref = 2504mV
-40
-20
0
20
40
TA (qC)
60
80
100 120 140
-40
-20
0
20
40
TA (qC)
60
80
100 120 140
IKA=1mA
图 2. Reference Voltage vs Free-Air Temperature
图 3. Reference Current vs Free-Air Temperature
100
80
40
30
20
10
TA = -40qC
TA = 25qC
TA = 85qC
TA = 125qC
60
40
20
0
-20
-40
-60
-80
-100
0
0
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
0.5
1
1.5
2
2.5
3
D001
VKA = VREF (V)
VKA = VREF (V)
D001
图 5. Cathode Current vs Cathode Voltage
图 4. Cathode Current vs Cathode Voltage
0.2
0.16
0.12
0.08
0.04
0
30
25
20
15
10
Ik(min)
-40
-20
0
20
40
TA (qC)
60
80
100 120 140
2.3
2.35
2.4
2.45
2.5
2.55
VKA = VREF (V)
图 7. Off-State Cathode Current vs Free-Air Temperature
图 6. Cathode Current vs Cathode Voltage
6
版权 © 2015, Texas Instruments Incorporated
ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
Typical Characteristics (接下页)
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the
various devices.
-0.1
-0.15
-0.2
0
-0.5
-1
-1.5
-2
Vref to 10V
10V to 36V
-0.25
-0.3
-2.5
-3
-3.5
-4
-0.35
-0.4
-4.5
-5
-0.45
-0.5
-5.5
-6
-40
-20
0
20
40
60
80
100 120 140
0
5
10
15
20
25
30
35
40
Temperature (qC)
Vka (V)
D001
IKA=1mA
IKA=1mA
图 8. Delta Reference Voltage vs Cathode Voltage
图 9. Delta Reference Voltage vs Cathode Voltage
900
840
780
720
660
600
150
130
110
90
Gain
Phase
70
50
30
10
-10
-30
-50
10
100
1000
Frequency (Hz)
10000
1000
10000
100000
1000000
Freq (kHz)
D001
图 26 used for this measurement.
IKA=1mA
IKA = 1 mA
图 11. Small-Signal Voltage Amplification vs Frequency
图 10. Noise Voltage
1.2
1.1
1
0.1
0.08
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.06
0.04
0.02
0
100
1000
10000
100000
1000000
-40
-20
0
20
40
60
80
100 120 140
Frequency (Hz)
TA (qC)
图 27 used for this measurement.
图 27 used for this measurement.
图 13. DC Output Impedance vs Temperature
图 12. Output Impedance vs Frequency
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ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
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Typical Characteristics (接下页)
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the
various devices.
2000
1000
Unstable
STABLE
100
STABLE
20
0.0001
0.001
0.01
CKA(PF)
0.1
1
10
D001
ESR < 20 mΩ
图 28 used to verify stability.
IKA = 100 µA
图 29 used for this measurement.
图 14. Pulse Response
图 15. Low IKA (VKA = 2.5 V) Stability Boundary Conditions
all ATL43xx Devices
2000
2000
Unstable
1000
1000
Unstable
STABLE
STABLE
100
20
100
STABLE
STABLE
20
0.0001
0.001
0.01
CKA(PF)
0.1
1
10
0.0001
0.001
0.01
CKA(PF)
0.1
1
10
D001
D001
ESR < 20 mΩ
图 28 used to verify stability.
ESR < 20 mΩ
图 28 used to verify stability.
图 16. Low IKA (VKA = 5.0 V) Stability Boundary Conditions
图 17. Low IKA (VKA = 10.0 V) Stability Boundary Conditions
all ATL43xx Devices
all ATL43xx Devices
2000
1000
100
Unstable
10
STABLE
100
Stable
1
20
0.0001
0.001
0.01
CKA(uF)
0.1
1
10
D001
0.0001
0.001
0.01
CKA(PF)
0.1
1
10
D001
ESR < 20 mΩ
图 28 used to verify stability.
ESR < 20mΩ
图 28 used to verify stability.
图 19. High IKA (VKA = 2.5 V) Stability Boundary Conditions
图 18. Low IKA (VKA = 15.0 V) Stability Boundary Conditions
all ATL43xx Devices
all ATL43xx Devices
8
版权 © 2015, Texas Instruments Incorporated
ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
Typical Characteristics (接下页)
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the
various devices.
100
10
1
100
10
1
Stable
Stable
Unstable
Unstable
0.0001
0.001
0.01
CKA(uF)
0.1
1
10
D001
0.0001
0.001
0.01
CKA(uF)
0.1
1
10
D001
ESR < 20 mΩ
图 28 used to verify stability.
ESR < 20 mΩ
图 28 used to verify stability.
图 20. High IKA (VKA = 5.0 V) Stability Boundary Conditions
图 21. High IKA (VKA = 10.0 V) Stability Boundary Conditions
all ATL43xx Devices
all ATL43xx Devices
100
10
1
Stable
0.0001
0.001
0.01
CKA(uF)
0.1
1
10
D001
ESR < 20 mΩ
图 28 used to verify stability.
图 22. High IKA (VKA = 15.0 V) Stability Boundary Conditions all ATL43xx Devices
版权 © 2015, Texas Instruments Incorporated
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ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
8 Parameter Measurement Information
Input
V
KA
Input
R1
V
KA
I
KA
I
KA
I
ref
V
ref
R2
V
ref
R1
R2
æ
ö
V
KA
= V
ref ç
1 +
+ I × R1
ref
÷
è
ø
图 23. Test Circuit for VKA = Vref
Input
图 24. Test Circuit for VKA > Vref
OUTPUT
V
KA
I
off
IK
10Nꢀ
2.5Nꢀ
10µF
+
-
5.0V
图 25. Test Circuit for Ioff
10Nꢀ
GND
图 26. Test Circuit for Phase and Gain Measurement
>250ꢀ
100ꢀ
OUTPUT
IK
R1 = 10Nꢀ
+
CL
Vbat
-
IK
R2
100ꢀ
-
+
>250ꢀ
IK
GND
图 27. Test Circuit for Reference Impedance (ZKA
+
)
Vbat
CL
-
图 28. Test Circuit for Stability Boundary Conditions
10
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ATL431, ATL432
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ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
Parameter Measurement Information (接下页)
25Nꢀ
OUTPUT
IK
Pulse
Generator
F = 100kHz
50 ꢀ
GND
图 29. Test Circuit for Pulse Response
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ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
9 Detailed Description
9.1 Overview
ATL43x is a low power counterpart to TL431 and TLV431, having lower minimum cathode current (Ik(min) = 35 µA
vs 0.1/1.0 mA). Like TL431, ATL43x is used in conjunction with it's key components to behave as a single
voltage reference, error amplifier, voltage clamp or comparator with integrated reference.
ATL43x can be operated and adjusted to cathode voltages from 2.5 V to 36 V, making this part optimum for a
wide range of end equipments in industrial, auto, telecom & computing. In order for this device to behave as a
shunt regulator or error amplifier, > 35 µA (Imin(max)) must be supplied in to the cathode pin. Under this
condition, feedback can be applied from the Cathode and Ref pins to create a replica of the internal reference
voltage.
Various reference voltage options can be purchased with initial tolerances (at 25°C) of 0.5% and 1.0%. These
reference options are denoted by B (0.5%) and A (1.0%) after the ATL43x.
The ATL43xxI devices are characterized for operation from –40°C to 85°C, and the ATL43xxQ devices are
characterized for operation from –40°C to 125°C.
9.2 Functional Block Diagram
CATHODE
REF
+
Vref
ANODE
9.3 Feature Description
ATL43x consists of an internal reference and amplifier that outputs a sink current based on the difference
between the reference pin and the virtual internal pin. The sink current is produced by an internal Darlington pair.
When operated with enough voltage headroom (≥ 2.5 V) and cathode current (IKA), ATL43x forces the reference
pin to 2.5 V. However, the reference pin can not be left floating, as it needs Iref ≥ 0.1 µA (please see the
Functional Block Diagram). This is because the reference pin is driven into an NPN, which needs base current in
order operate properly.
When feedback is applied from the Cathode and Reference pins, ATL43x behaves as a Zener diode, regulating
to a constant voltage dependent on current being supplied into the cathode. This is due to the internal amplifier
and reference entering the proper operating regions. The same amount of current needed in the above feedback
situation must be applied to this device in open loop, servo or error amplifying implementations in order for it to
be in the proper linear region giving ATL43x enough gain.
Unlike many linear regulators, ATL43x is internally compensated to be stable without an output capacitor
between the cathode and anode; however, if it is desired to use an output capacitor 图 15 through 图 22 can be
used as a guide to assist in choosing the correct capacitor to maintain stability.
12
版权 © 2015, Texas Instruments Incorporated
ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
9.4 Device Functional Modes
9.4.1 Open Loop (Comparator)
When the cathode/output voltage or current of ATL43x is not being fed back to the reference/input pin in any
form, this device is operating in open loop. With such high gain in this configuration, ATL43x is typically used as
a comparator. Due to the integrated reference, the ATL43x allows users to monitor a certain level of a single
signal.
9.4.2 Closed Loop
When the cathode/output voltage or current of ATL43x is being fed back to the reference/input pin in any form,
this device is operating in closed loop. The majority of applications involving ATL43x use it in this manner to
regulate a fixed voltage or current. The feedback enables this device to behave as an error amplifier, computing
a portion of the output voltage and adjusting it to maintain the desired regulation. This is done by relating the
output voltage back to the reference pin in a manner to make it equal to the internal reference voltage, which can
be accomplished via resistive or direct feedback.
版权 © 2015, Texas Instruments Incorporated
13
ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
10 Applications and Implementation
注
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
图 30 shows the ATL43x used in a 24-V isolated flyback supply. The output of the regulator, plus the forward
voltage drop of the optocoupler LED (2.5 + 0.7 = 3.2 V), determine the minimum voltage that can be regulated in
an isolated supply configuration. Regulated voltage as low as 5.0 Vdc is possible in the topology shown in 图 30.
The 431 family of devices are prevalent in these applications, being designers go to choice for secondary side
regulation. Due to this prevalence, this section will further go on to explain operation and design in both states of
ATL43x that this application will see, open loop (Comparator + Vref) & closed loop (Shunt Regulator).
ATL43x's key benefit in isolated supplies is the no load power savings gained by the > 20x decrease in IKmin from
TL431. More information about this and other benefits can be found in the application note Designing with the
"Advanced" TL431, ATL431 SLVA685. Further information about system stability and using a ATL43x device for
compensation can be found in the application note Compensation Design With TL431 for UCC28600, SLUA671.
VI
120 V
Vo=24 V
IKMIN
Gate Drive
VCC
Controller
VFB
ATL431
Current
Sense
GND
图 30. Flyback With Isolation Using ATL43x
as Voltage Reference and Error Amplifier
14
版权 © 2015, Texas Instruments Incorporated
ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
10.2 Typical Applications
10.2.1 Comparator with Integrated Reference (Open Loop)
Vsup
Rsup
Vout
CATHODE
R1
R2
VL
RIN
VIN
REF
+
2.5V
ANODE
图 31. Comparator Application Schematic
10.2.1.1 Design Requirements
For this design example, use the parameters listed in 表 1 as the input parameters.
表 1. Design Parameters
DESIGN PARAMETER
Input Voltage Range
Input Resistance
EXAMPLE VALUE
0 V to 3.3 V
100 kΩ
Supply Voltage
5 V
Cathode Current (IK)
Output Voltage Level
Logic Input Thresholds VIH/VIL
50 µA
~2 V - Vsup
1.5 V / 0.8 V
10.2.1.2 Detailed Design Procedure
When using ATL43x as a comparator with reference, determine the following:
•
•
•
•
Input voltage range
Reference voltage accuracy
Output logic input high and low level thresholds
Current source resistance
10.2.1.2.1 Basic Operation
In the configuration shown in 图 31 ATL43x will behave as a comparator, comparing the Vref pin voltage to the
internal virtual reference voltage. When provided a proper cathode current (Ik), ATL43x will have enough open
loop gain to provide a quick response. With the ATL43x's max Operating Current (Imin) being 35 µA and up to 40
µA over temperature, operation below that could result in low gain, leading to a slow response.
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15
ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
10.2.1.2.2 Overdrive
Slow or inaccurate responses can also occur when the reference pin is not provided enough overdrive voltage.
This is the amount of voltage that is higher than the internal virtual reference. The internal virtual reference
voltage will be within the range of 2.5 V ±(0.5% or 1.0%) depending on which version is being used.
The more overdrive voltage provided, the faster the ATL43x will respond.
For applications where ATL43x is being used as a comparator, it is best to set the trip point to greater than the
positive expected error (i.e. +1.0% for the A version). For fast response, setting the trip point to > 10% of the
internal Vref should suffice. 图 32 shows the transition from VOH to VOL based on the input voltage and can be
used as a guide for selecting the overdrive voltage.
For minimal voltage drop or difference from Vin to the ref pin, it is recommended to use an input resistor < 1 MΩ
to provide Iref.
10.2.1.2.3 Output Voltage and Logic Input Level
In order for ATL43x to properly be used as a comparator, the logic output must be readable by the receiving logic
device. This is accomplished by knowing the input high and low level threshold voltage levels, typically denoted
by VIH & VIL.
As seen in 图 32, ATL43x's output low level voltage in open-loop/comparator mode is ~2 V, which is sufficient for
some ≥ 5.0 V supplied logic. However, would not work for 3.3 V and 1.8 V supplied logic. In order to
accommodate this, a resistive divider can be tied to the output to attenuate the output voltage to a voltage legible
to the receiving low voltage logic device.
ATL43x's output high voltage is approximately Vsup due to ATL43x being open-collector. If Vsup is much higher
than the receiving logic's maximum input voltage tolerance, the output must be attenuated to accommodate the
outgoing logic's reliability.
When using a resistive divider on the output, be sure to make the sum of the resistive divider (R1 & R2 in 图 31)
is much greater than Rsup in order to not interfere with ATL43x's ability to pull close to Vsup when turning off.
10.2.1.2.3.1 Input Resistance
ATL43x requires an input resistance in this application in order to source the reference current (Iref) needed from
this device to be in the proper operating regions while turning on. The actual voltage seen at the ref pin will be:.
Vref = Vin – Iref × Rin
(1)
Since Iref can be as high as 0.15 µA it is recommended to use a resistance small enough that will mitigate the
error that Iref creates from Vin. Also, the input resistance must be set high enough as to not surpass the absolute
maximum of 10mA.
10.2.1.3 Application Curves
5.5
5.25
5
4.75
4.5
4.25
4
3.75
3.5
3.25
3
2.75
2.5
2.25
2
1.75
1.5
2
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
VIN (V)
3
D001
RIN = 100 kΩ
VSUP = 5.0 V
RSUP = 10 kΩ
图 32. Open Loop (Comparator Mode) Vout vs. Vin
16
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ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
10.2.2 Shunt Regulator/Reference
RSUP
R1
VSUP
VO
= 1 +
(
)VREF
R2
R1
CATHODE
0.1%
REF
VREF
ATL431
ANODE
CL
R2
0.1%
图 33. Shunt Regulator Schematic
10.2.2.1 Design Requirements
For this design example, use the parameters listed in 表 2 as the input parameters.
表 2. Design Parameters
DESIGN PARAMETER
Reference Initial Accuracy
Supply Voltage
EXAMPLE VALUE
1.0%
48 V
Cathode Current (IK)
50 µA
Output Voltage Level
2.5 V - 36 V
1 nF
Load Capacitance
Feedback Resistor Values and Accuracy (R1 & R2)
10 kΩ
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ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
10.2.2.2 Detailed Design Procedure
When using ATL43x as a Shunt Regulator, determine the following:
•
•
•
•
•
•
Input voltage range
Temperature range
Total accuracy
Cathode current
Reference initial accuracy
Output capacitance
10.2.2.2.1 Programming Output/Cathode Voltage
In order to program the cathode voltage to a regulated voltage a resistive bridge must be shunted between the
cathode and anode pins with the mid point tied to the reference pin. This can be seen in 图 33, with R1 & R2
being the resistive bridge. The cathode/output voltage in the shunt regulator configuration can be approximated
by the equation shown in 图 33. The cathode voltage can be more accuratel determined by taking in to account
the cathode current:
VO = (1 + R1/R2) × Vref – Iref × R1
(2)
In order for this equation to be valid, ATL43x must be fully biased so that it has enough open loop gain to
mitigate any gain error. This can be done by meeting the Imin spec denoted in Electrical Characteristics,
ATL431Ax, ATL432Ax table.
10.2.2.2.2 Total Accuracy
When programming the output above unity gain (VKA= Vref), ATL43x is susceptible to other errors that may effect
the overall accuracy beyond Vref. These errors include:
•
•
•
•
R1 and R2 accuracies
VI(dev) - Change in reference voltage over temperature
ΔVref / ΔVKA - Change in reference voltage to the change in cathode voltage
|zKA| - Dynamic impedance, causing a change in cathode voltage with cathode current
Worst case cathode voltage can be determined taking all of the variables in to account. Application note
SLVA445 assists designers in setting the shunt voltage to achieve optimum accuracy for this device.
10.2.2.2.3 Stability
Though ATL43x is stable with no capacitive load, the device that receives the shunt regulator's output voltage
could present a capacitive load that is within the ATL43x region of stability, shown in 图 15 through 图 22. Also,
designers may use capacitive loads to improve the transient response or for power supply decoupling.
图 15 through 图 22 should be used as a guide for capacitor selection and compensation. It is characterized
using ceramic capacitors with very low ESR. When it is desirable to use a capacitor within the unstable region,
higher ESR capacitors can be used to stabilize ATL43x or an external series resistance can be added. For more
information and guidance on ESR values, please refer to the application note Designing with the "Advanced"
TL431, ATL431 SLVA685.
Unlike TL431, the stability boundary is characterized and determined with resistors 250Ω and greater. Which is
more suitable for low cathode current applications.
18
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ATL431, ATL432
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ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
10.2.2.3 Application Curves
图 34. ATL43x Start-up Response IKA = 50 µA
图 35. ATL43x Start-up Response IKA = 1 mA
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19
ATL431, ATL432
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
www.ti.com.cn
11 Power Supply Recommendations
When using ATL43x as a Linear Regulator to supply a load, designers will typically use a bypass capacitor on
the output/cathode pin. Be sure that the capacitance is within the stability criteria shown in 图 15 through 图 22.
In order to not exceed the maximum cathode current, be sure that the supply voltage is current limited. Also, be
sure to limit the current being driven into the Ref pin, as not to exceed it's absolute maximum rating.
For applications shunting high currents, pay attention to the cathode and anode trace lengths, adjusting the width
of the traces to have the proper current density.
12 Layout
12.1 Layout Guidelines
Place decoupling capacitors as close to the device as possible. Use appropriate widths for traces when shunting
high currents to avoid excessive voltage drops.
12.2 Layout Example
DBZ
(TOP VIEW)
Rref
REF
Vin
1
2
ANODE
3
Rsup
CATHODE
GND
Vsup
CL
GND
图 36. DBZ Layout Example
20
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ATL431, ATL432
www.ti.com.cn
ZHCSDN9A –MARCH 2015–REVISED APRIL 2015
13 器件和文档支持
13.1 相关链接
以下表格列出了快速访问链接。 范围包括技术文档、支持与社区资源、工具和软件，并且可以快速访问样片或购买
链接。
表 3. 相关链接
器件
产品文件夹
请单击此处
请单击此处
样片与购买
请单击此处
请单击此处
技术文档
请单击此处
请单击此处
工具与软件
请单击此处
请单击此处
支持与社区
请单击此处
请单击此处
ATL431
ATL432
13.2 商标
All trademarks are the property of their respective owners.
13.3 静电放电警告
这些装置包含有限的内置 ESD 保护。 存储或装卸时，应将导线一起截短或将装置放置于导电泡棉中，以防止 MOS 门极遭受静电损
伤。
13.4 术语表
SLYZ022 — TI 术语表。
这份术语表列出并解释术语、首字母缩略词和定义。
14 机械、封装和可订购信息
以下页中包括机械、封装和可订购信息。 这些信息是针对指定器件可提供的最新数据。 这些数据会在无通知且不
对本文档进行修订的情况下发生改变。 欲获得该数据表的浏览器版本，请查阅左侧的导航栏。
版权 © 2015, Texas Instruments Incorporated
21
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
ATL431AIDBZR
ATL431AQDBZR
ATL431BIDBZR
ATL431BQDBZR
ATL432AIDBZR
ATL432AQDBZR
ATL432BIDBZR
ATL432BQDBZR
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
3
3
3
3
3
3
3
3
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
3000 RoHS & Green NIPDAU | NIPDAUAG Level-1-260C-UNLIM
-40 to 85
-40 to 125
-40 to 85
-40 to 125
-40 to 85
-40 to 125
-40 to 85
-40 to 125
(ZCKS, ZCR3)
(ZCLS, ZCS3)
(ZCMS, ZCT3)
(ZCJS, ZCU3)
(ZCNS, ZCV3)
(ZCOS, ZCW3)
(ZCPS, ZCX3)
(ZCQS, ZCY3)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Feb-2018
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
ATL431AIDBZR
ATL431AIDBZR
ATL431AQDBZR
ATL431AQDBZR
ATL431BIDBZR
ATL431BIDBZR
ATL431BQDBZR
ATL431BQDBZR
ATL432AIDBZR
ATL432AIDBZR
ATL432AQDBZR
ATL432AQDBZR
ATL432BIDBZR
ATL432BIDBZR
ATL432BQDBZR
ATL432BQDBZR
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
180.0
178.0
180.0
178.0
180.0
178.0
178.0
180.0
178.0
180.0
178.0
180.0
180.0
178.0
178.0
180.0
8.4
9.2
8.4
9.2
8.4
9.2
9.2
8.4
9.2
8.4
9.2
8.4
8.4
9.2
9.2
8.4
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
3.15
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
2.77
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
1.22
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
4.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Q3
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Feb-2018
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
ATL431AIDBZR
ATL431AIDBZR
ATL431AQDBZR
ATL431AQDBZR
ATL431BIDBZR
ATL431BIDBZR
ATL431BQDBZR
ATL431BQDBZR
ATL432AIDBZR
ATL432AIDBZR
ATL432AQDBZR
ATL432AQDBZR
ATL432BIDBZR
ATL432BIDBZR
ATL432BQDBZR
ATL432BQDBZR
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
SOT-23
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
DBZ
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
3000
183.0
180.0
183.0
180.0
183.0
180.0
180.0
183.0
180.0
183.0
180.0
183.0
183.0
180.0
180.0
183.0
183.0
180.0
183.0
180.0
183.0
180.0
180.0
183.0
180.0
183.0
180.0
183.0
183.0
180.0
180.0
183.0
20.0
18.0
20.0
18.0
20.0
18.0
18.0
20.0
18.0
20.0
18.0
20.0
20.0
18.0
18.0
20.0
Pack Materials-Page 2
PACKAGE OUTLINE
DBZ0003A
SOT-23 - 1.12 mm max height
S
C
A
L
E
4
.
0
0
0
SMALL OUTLINE TRANSISTOR
C
2.64
2.10
1.12 MAX
1.4
1.2
B
A
0.1 C
PIN 1
INDEX AREA
1
0.95
(0.125)
3.04
2.80
1.9
3
(0.15)
NOTE 4
2
0.5
0.3
3X
0.10
0.01
(0.95)
TYP
0.2
C A B
0.25
GAGE PLANE
0.20
0.08
TYP
0.6
0.2
TYP
SEATING PLANE
0 -8 TYP
4214838/D 03/2023
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Reference JEDEC registration TO-236, except minimum foot length.
4. Support pin may differ or may not be present.
www.ti.com
EXAMPLE BOARD LAYOUT
DBZ0003A
SOT-23 - 1.12 mm max height
SMALL OUTLINE TRANSISTOR
PKG
3X (1.3)
1
3X (0.6)
SYMM
3
2X (0.95)
2
(R0.05) TYP
(2.1)
LAND PATTERN EXAMPLE
SCALE:15X
SOLDER MASK
OPENING
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
METAL
0.07 MIN
ALL AROUND
0.07 MAX
ALL AROUND
NON SOLDER MASK
DEFINED
SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
4214838/D 03/2023
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
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EXAMPLE STENCIL DESIGN
DBZ0003A
SOT-23 - 1.12 mm max height
SMALL OUTLINE TRANSISTOR
PKG
3X (1.3)
1
3X (0.6)
SYMM
3
2X(0.95)
2
(R0.05) TYP
(2.1)
SOLDER PASTE EXAMPLE
BASED ON 0.125 THICK STENCIL
SCALE:15X
4214838/D 03/2023
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
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