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參數(shù)資料
| 型號(hào)： | LM4041ETB-122GT3 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3 |
| 封裝： | HALOGEN FREE, BFR FREE AND ROHS COMPLIANT, TO-236, SOT-23, 3 PIN |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | LM4041ETB-122GT3 |
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LM4040, LM4041
http://onsemi.com
10
Device Description
The LM404x shunt references use ON Semiconductor’s
floating gate (EEPROM) technology to produce a capacitor
which stores an accurate and stable voltage that is used as the
reference voltage for a control amplifier and shunt
Nchannel FET.
Figure 12. Functional Block Diagram
VREF
+
The device operates like a zener diode; maintaining a
fixed voltage across its output terminals when biased with
60
mA to 15 mA of reverse current. The LM404x will also
act like a silicon diode when forward biased with currents up
to 10 mA.
Applications Information
The LM404x’s internal pass transistor maintains a
constant output voltage by sinking the necessary amount of
current across a source resistor. The source resistance (RS)
is set by the load current range (ILOAD), supply voltage (VS)
variations, LM404x’s terminal voltage (VR), and desired
quiescent current.
Figure 13. Typical Operating Circuit
ISHUNT
ILOAD
RS
VS
VR
To select a value of RS, set VS at its minimum value and
ILOAD at its maximum. Be sure to maintain a minimum
operating current of 60
mA through LM404x at all times, as
LM404x uses this current to power its internal circuitry. The
RS value should be large enough to keep ISHUNT less than
15 mA for proper regulation when VS is maximum and
ILOAD is at a minimum. Therefore, the value of RS is
bounded by the following equation:
VS(min) * VR
60 mA ) ILOAD(max)
u RS
and
RS u
VS(max) * VR
15 mA ) ILOAD(min)
Choosing a larger resistance minimizes the power
dissipated in the circuit by reducing the shunt current.
Output Capacitance
The LM404x does not require an external capacitor for
frequency stability and is stable for any output capacitance.
Effect of Temperature
LM404x has an output voltage temperature coefficient of
typically
±15 to ±30 ppm/°C meaning the LM404x’s output
voltage will change by 50 – 100
mV/°C for a 3.300 V
regulator. The polarity of this temperature induced voltage
shift can vary from device to device, some moving in the
positive direction and others in the negative direction.
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參數(shù)描述 |
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