LM317BT 查看數據表（PDF） - ON Semiconductor

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LM317BT

1.5 A Adjustable Output, 1.5 A Adjustable Output,

ON Semiconductor 

LM317, NCV317

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Input−Output Voltage Differential

VI−VO

40

Vdc

Power Dissipation

Case 221A

TA = +25°C

Thermal Resistance, Junction−to−Ambient

Thermal Resistance, Junction−to−Case

Case 936 (D2PAK−3)

TA = +25°C

Thermal Resistance, Junction−to−Ambient

Thermal Resistance, Junction−to−Case

PD

Internally Limited W

qJA

65

°C/W

qJC

5.0

°C/W

PD

Internally Limited W

qJA

70

°C/W

qJC

5.0

°C/W

Operating Junction Temperature Range

TJ

−55 to +150

°C

Storage Temperature Range

Tstg

−65 to +150

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

ELECTRICAL CHARACTERISTICS (VI−VO = 5.0 V; IO = 0.5 A for D2T and T packages; TJ = Tlow to Thigh (Note 1); Imax and Pmax

(Note 2); unless otherwise noted.)

Characteristics

Figure Symbol

Min

Typ

Max

Unit

Line Regulation (Note 3), TA = +25°C, 3.0 V ≤ VI−VO ≤ 40 V

1

Load Regulation (Note 3), TA = +25°C, 10 mA ≤ IO ≤ Imax

2

VO ≤ 5.0 V

VO ≥ 5.0 V

Thermal Regulation, TA = +25°C (Note 4), 20 ms Pulse

Adjustment Pin Current

3

Adjustment Pin Current Change, 2.5 V ≤ VI−VO ≤ 40 V,

1, 2

10 mA ≤ IL ≤ Imax, PD ≤ Pmax

Reference Voltage, 3.0 V ≤ VI−VO ≤ 40 V,

3

10 mA ≤ IO ≤ Imax, PD ≤ Pmax

Line Regulation (Note 3), 3.0 V ≤ VI−VO ≤ 40 V

1

Load Regulation (Note 3), 10 mA ≤ IO ≤ Imax

2

VO ≤ 5.0 V

VO ≥ 5.0 V

Temperature Stability (Tlow ≤ TJ ≤ Thigh)

3

Minimum Load Current to Maintain Regulation (VI−VO = 40 V)

3

Maximum Output Current

3

VI−VO ≤ 15 V, PD ≤ Pmax, T Package

VI−VO = 40 V, PD ≤ Pmax, TA = +25°C, T Package

RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz

Ripple Rejection, VO = 10 V, f = 120 Hz (Note 5)

4

Without CAdj

CAdj = 10 mF

Long−Term Stability, TJ = Thigh (Note 6), TA = +25°C for

3

Endpoint Measurements

Regline

Regload

Regtherm

IAdj

DIAdj

Vref

Regline

Regload

TS

ILmin

Imax

N

RR

S

−

−

−

−

−

−

1.2

−

−

−

−

−

1.5

0.15

−

−

66

−

0.01

5.0

0.1

0.03

50

0.2

1.25

0.02

20

0.3

0.7

3.5

2.2

0.4

0.003

65

80

0.3

0.04

%/V

25

mV

0.5

% VO

0.07

% VO/W

100

mA

5.0

mA

1.3

V

0.07

%V

70

mV

1.5

% VO

−

% VO

10

mA

A

−

−

−

% VO

dB

−

−

1.0

%/1.0 k

Hrs.

Thermal Resistance Junction−to−Case, T Package

RqJC

−

5.0

−

°C/W

1. Tlow to Thigh = 0° to +125°C, for LM317T, D2T. Tlow to Thigh = − 40° to +125°C, for LM317BT, BD2T, Tlow to Thigh = − 55° to +150°C, for

NCV317BT, BD2T.

2. Imax = 1.5 A, Pmax = 20 W

3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account

separately. Pulse testing with low duty cycle is used.

4. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die.

These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these

temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.

5. CAdj, when used, is connected between the adjustment pin and ground.

6. Since Long−Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average

stability from lot to lot.

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