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PDF A1201 Data sheet ( Hoja de datos )
| Número de pieza | A1201 | |
| Descripción | (A1201 - A1204) Continuous-Time Bipolar Switch Family | |
| Fabricantes | Allegro MicroSystems | |
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A1201, A1202, A1203, and A1204
Continuous-Time Bipolar Switch Family
Features and Benefits
▪ Continuous-time operation
▫ Fast power-on time
▫ Low noise
▪ Stable operation over full operating temperature range
▪ Reverse battery protection
▪ Solid-state reliability
▪ Factory-programmed at end-of-line for optimum
performance
▪ Robust EMC performance
▪ High ESD rating
▪ Regulator stability without a bypass capacitor
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The Allegro® A1201, A1202, A1203, and A1204 Hall-effect
bipolar switches are next-generation replacements and
extension of the popular Allegro A3134, A3133, and A3132
bipolar switch product line. Overall, theA120x family, produced
with BiCMOS technology, consists of continuous-time devices
that feature fast power-on time and low-noise operation. Device
programming is performed after packaging, to ensure increased
switchpoint accuracy by eliminating offsets that can be induced
by package stress. Unique Hall element geometries and low-
offset amplifiers help to minimize noise and to reduce the
residual offset voltage normally caused by device overmolding,
temperature excursions, and thermal stress.
TheA120x Hall-effect bipolar switches include the following on
a single silicon chip: voltage regulator, Hall-voltage generator,
small-signal amplifier, Schmitt trigger, and NMOS output
transistor. The integrated voltage regulator permits operation
from 3.8 to 24 V. The extensive on-board protection circuitry
makes possible a ±30 V absolute maximum voltage rating for
superior protection in automotive and motor commutation
www.DataSheet4U.com
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
A1201-DS, Rev. 5
Regulator
To all subcircuits
Amp
Gain
Offset
Trim
Control
VOUT
GND
1 page  
A1201, A1202,
A1203, and A1204
Continuous-Time Bipolar Switch Family
Characteristic Data
Supply Current (On) versus Ambient Temperature
(A1201/02/03/04)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
–50
VCC (V)
24
3.8
0 50 100 150
TA (°C)
Supply Current (Off) versus Ambient Temperature
(A1201/02/03/04)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
–50
VCC (V)
24
3.8
0 50 100 150
TA (°C)
Output Voltage (On) versus Ambient Temperature
(A1201/02/03/04)
400
350
300
250 VCC (V)
200 24
3.8
150
100
50
0
–50
0 50 100
TA (°C)
150
Supply Current (On) versus Supply Voltage
(A1201/02/03/04)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
TA (°C)
–40
25
150
5 10 15 20 25
VCC (V)
Supply Current (Off) versus Supply Voltage
(A1201/02/03/04)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
TA (°C)
–40
25
150
5 10 15 20 25
VCC (V)
Output Voltage (On) versus Supply Voltage
(A1201/02/03/04)
400
350
300
250 TA (°C)
–40
200 25
150 150
100
50
0
0 5 10 15 20 25
VCC (V)
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A1201, A1202,
A1203, and A1204
Continuous-Time Bipolar Switch Family
Power Derating
Power Derating
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating sup-
plied power or improving the heat dissipation properties of the
application. This section presents a procedure for correlating
factors affecting operating TJ. (Thermal data is also available on
the Allegro MicroSystems Web site.)
The Package Thermal Resistance, RθJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity,
K, of the printed circuit board, including adjacent devices and
traces. Radiation from the die through the device case, RθJC, is
relatively small component of RθJA. Ambient air temperature,
TA, and air motion are significant external factors, damped by
overmolding.
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
×PD = VIN IIN
(1)
ΔT = PD × RθJA (2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 4 mA, and RθJA = 140 °C/W, then:
PD = VCC × ICC = 12 V × 4 mA = 48 mW
ΔT = PD × RθJA = 48 mW × 140 °C/W = 7°C
TJ = TA + ΔT = 25°C + 7°C = 32°C
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max),
at a selected RθJA and TA.
Example: Reliability for VCC at TA=150°C, package UA, using
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
RθJA= 165°C/W, TJ(max) = 165°C, VCC(max) = 24 V, and
ICC(max) = 7.5 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
ΔTmax = TJ(max) – TA = 165 °C – 150 °C = 15 °C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
PD(max) = ΔTmax ÷ RθJA = 15°C ÷ 165 °C/W = 91 mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 91 mW ÷ 7.5 mA = 12.1 V
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est).
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A1201.PDF ] | |
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