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A1125 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 A1125
기능 Chopper Stabilized Precision Hall Effect Switches
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A1125 데이터시트, 핀배열, 회로
A1120 and A1125
www.DataSheet4U.com
Chopper Stabilized Precision Hall Effect Switches
Features and Benefits
Unipolar switchpoints
Resistant to physical stress
Superior temperature stability
Output short-circuit protection
Operation from unregulated supply
Reverse battery protection
Solid-state reliability
Small package sizes
Packages:
3-pin SOT23W (suffix LH)
Not to scale
3-pin SIP (suffix UA)
Description
The A1120 and A1125 Hall-effect, unipolar switches are
extremely temperature-stable and stress-resistant sensor ICs,
especially suited for operation over extended temperature
ranges to 150°C. Superior high-temperature performance is
made possible through dynamic offset cancellation, which
reduces the residual offset voltage normally caused by device
overmolding, temperature dependencies, and thermal stress.
Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper
stabilization, Schmitt trigger, and a short-circuit protected
open-collector output to sink up to 25 mA.
An on-board regulator permits operation with supply voltages
of 3 to 24 V. The advantage of operating down to 3 V is that
the device can be used in 3 V applications or with additional
external resistance in series with the supply pin for greater
protection against high voltage transient events.
For the A1120, a south pole of sufficient strength turns the
output on. Removal of the magnetic field turns the output off.
The A1125 is complementary to the A1120 in that, for the
A1125, a south pole turns the output off, and removal of the
magnetic field turns the output on.
Two package styles provide a magnetically optimized package
for most applications. Package type LH is a modified SOT23W,
surface mount package, while UAis a three-lead ultra-mini SIP
for through-hole mounting. Each package type is lead (Pb) free
(suffix, –T), with a 100% matte tin plated leadframe.
Functional Block Diagram
VCC
Amp
Regulator
Low-Pass
Filter
To All Subcircuits
Control
Current Limit
VOUT
A1120-DS, Rev. 9
GND




A1125 pdf, 반도체, 판매, 대치품
A1120 and
A1125
Chopper Stabilized Precision Hall Effect Switcheswww.DataSheet4U.com
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions
Package LH, 1-layer PCB with copper limited to solder pads
Package LH, 2-layer PCB with 0.463 in.2 of copper area each
side connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
Value Units
228 ºC/W
110 ºC/W
165 ºC/W
Power Derating Curve
TJ(max) = 165ºC; ICC = ICC(max)
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
Package LH, 2-layer PCB
(RQJA = 110 ºC/W)
10
9
Package UA, 1-layer PCB
8
7
6
(RQJA = 165 ºC/W)
Package LH, 1-layer PCB
5 (RQJA = 228 ºC/W)
4
3
2
VCC(max)
VCC(min)
20 40 60 80 100 120 140 160 180
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
(RPQaJAck=a(Rg1PQe6JaA5Uck=ºAaC1,g/11eW0-Ll)aºHCy,/eW2r-l)PayCeBr PCB
(RPQaJcAk=ag2e2L8HºC, 1/W-la)yer PCB
40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A1125 전자부품, 판매, 대치품
A1120 and
A1125
Chopper Stabilized Precision Hall Effect Switcheswww.DataSheet4U.com
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 supplied
power or improving the heat dissipation properties of the appli-
cation. This section presents a procedure for correlating factors
affecting operating TJ. (Thermal data is also available on the
Allegro MicroSystems website.)
The Package Thermal Resistance, RJA, 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, RJC, is relatively
small component of RJA. 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)
 T = PD × RJA
(2)
TJ = TA + ΔT
(3)
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 1.6 mA, and RJA = 165 °C/W, then:
PD = VCC × ICC = 12 V × 1.6 mA = 19 mW
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max),
at a selected RJA and TA.
Example: Reliability for VCC at TA=150°C, package LH, using a
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
RJA=228°C/W, TJ(max) =165°C, VCC(max) = 24 V, and
ICC(max) = 4 mA.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
Tmax = 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) = Tmax ÷ RJA = 15°C ÷ 228 °C/W = 66 mW
Finally, invert equation 1 with respect to voltage:
VCC(est) = PD(max) ÷ ICC(max) = 66 mW ÷ 4 mA = 16.5 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
RJA. If VCC(est) VCC(max), then operation between VCC(est)
and VCC(max) is reliable under these conditions.
 T = PD × RJA = 19 mW × 165 °C/W = 3°C
TJ = TA + T = 25°C + 3°C = 28°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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