LM317A

現行

具高精確度的 1.5-A、40-V、可調式線性電壓穩壓器

立即訂購

產品規格表

document-pdfAcrobat LM317A 1% Accurate 1.5A Adjustable Voltage Regulator datasheet (Rev. A) (英文) PDF | HTML

LM317A

現行

產品規格表

立即訂購

產品詳細資料

Output options

Adjustable Output, Fixed Output

Iout (max) (A)

1.5

Vin (max) (V)

40

Vin (min) (V)

3

Vout (max) (V)

37

Vout (min) (V)

1.2

Fixed output options (V)

37

Rating

Catalog, Military

Noise (µVrms)

38

PSRR at 100 KHz (dB)

40

Iq (typ) (mA)

5

Thermal resistance θJA (°C/W)

24

Load capacitance (min) (µF)

0

Regulated outputs (#)

1

Accuracy (%)

5

Dropout voltage (Vdo) (typ) (mV)

2250

Operating temperature range (°C)

-40 to 125

Output options

Adjustable Output, Fixed Output

Iout (max) (A)

1.5

Vin (max) (V)

40

Vin (min) (V)

3

Vout (max) (V)

37

Vout (min) (V)

1.2

Fixed output options (V)

37

Rating

Catalog, Military

Noise (µVrms)

38

PSRR at 100 KHz (dB)

40

Iq (typ) (mA)

5

Thermal resistance θJA (°C/W)

24

Load capacitance (min) (µF)

0

Regulated outputs (#)

1

Accuracy (%)

5

Dropout voltage (Vdo) (typ) (mV)

2250

Operating temperature range (°C)

-40 to 125

SOT-223 (DCY)

4

45.5 mm² 6.5 x 7

TO-220 (NDE)

3

46.5328 mm² 10.16 x 4.58

TO-252 (NDP)

3

65.2078 mm² 6.58 x 9.91

TO-CAN (NDT)

3

91.6742 mm² 10.03 x 9.14

For a newer drop-in alternative, see the LM317
Typical 0.005%/V line regulation
1% output voltage tolerance
1.5-A output current
Adjustable output down to 1.25 V
Input-output differential up to 40 V
Current limit constant with temperature
No output capacitor required
Short-circuit protected output
−40°C to 125°C operating temperature range

For a newer drop-in alternative, see the LM317
Typical 0.005%/V line regulation
1% output voltage tolerance
1.5-A output current
Adjustable output down to 1.25 V
Input-output differential up to 40 V
Current limit constant with temperature
No output capacitor required
Short-circuit protected output
−40°C to 125°C operating temperature range

The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators.

The LM317A offers full overload protection such as over current, thermal-overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response and can be replaced with a ceramic and appropriate ESR. The adjustment terminal can be bypassed to achieve very high ripple-rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the LM317A regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Exceeding the maximum input-to-output deferential will result in short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM317A can be also used as a precision current regulator.

For applications requiring greater output current, see the LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see the LM137 series data sheet.

The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators.

The LM317A offers full overload protection such as over current, thermal-overload protection, and safe-area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response and can be replaced with a ceramic and appropriate ESR. The adjustment terminal can be bypassed to achieve very high ripple-rejection ratios that are difficult to achieve with standard 3-terminal regulators.

Because the LM317A regulator is floating and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. Exceeding the maximum input-to-output deferential will result in short-circuiting the output. By connecting a fixed resistor between the adjustment pin and output, the LM317A can be also used as a precision current regulator.

For applications requiring greater output current, see the LM150 series (3A) and LM138 series (5A) data sheets. For the negative complement, see the LM137 series data sheet.

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LM317A-337N-EVM — 3 針腳可調整穩壓器評估模組

The LM317A-337N-EVM demonstrates canonical application of the LM317A adjustable regulator and its negative complement, the LM337-N. The evaluation module (EVM) is assesmbled with the SOT-223 package option for each device, supplying up to 1 A of load current. The EVM is designed for easy (...)

使用指南: PDF