Datasheet > LT1244

LT1244

更新时间： 2023-12-20 18:44:04

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亚德诺 - ADI		/
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20页	1183K
描述
高速电流模式脉宽调制器

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LT1244 数据手册

LT1241 Series

ELECTRICAL CHARACTERISTICS ^Thel denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. (Notes 2 and 3)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Section

Output Voltage

I = 1mA, T = 25°C

4.925

5.000

5.075

Line Regulation

12V < V < 25V

Load Regulation

1mA < I

< 20mA

–6

–25

VREF

Temperature Stability

Total Output Variation

Output Noise Voltage

Long Term Stability

Output Short-Circuit Current

Oscillator Section

Initial Accuracy

0.1

mV/°C

Line, Load, Temp

10Hz < F < 10kHz, T = 25°C

4.87

–30

5.13

µV

T = 125°C, 1000 Hrs

–90

–180

R = 10k, C = 3.3nF, T = 25°C

47.5

228

52.5

268

kHz

R = 13.0k, C = 500pF, T = 25°C

248

Voltage Stability

12V < V < 25V, T = 25°C

CC J

Temperature Stability

Amplitude

< T < T

MAX

–0.05

1.7

%/°C

MIN

T = 25°C (Pin 4)

Clock Ramp Reset Current

Error Amplifier Section

Feedback Pin Input Voltage

Input Bias Current

(Pin 4) = 2V, T = 25°C

7.9

8.2

8.5

OSC

= 2.5V

2.42

2.50

2.58

–2

µA

PIN1

= 2.5V

Open-Loop Voltage Gain

Unity-Gain Bandwidth

Power Supply Rejection Ratio

Output Sink Current

2 < V < 4V

0.7

T = 25°C

1.3

MHz

12V < V < 25V

PIN2

= 2.7V, V

= 2.3V, V

= 1.1V

= 5V

PIN1

Output Source Current

Error Amplifier Section

Output Voltage High Level

Output Voltage Low Level

Current Sense Section

Gain

–0.5

–0.75

= 2.3V, R = 15k to GND

5.6

0.2

PIN2

= 2.7V, R = 15k to Pin 8

1.1

PIN2

2.85

0.90

3.00

1.00

3.15

1.10

V/V

Maximum Current Sense Input Threshold

Power Supply Rejection Ratio

Input Bias Current

PIN3

< 1.1V

µA

–1

Delay to Output

100

Blanking Time

100

1.5

Blanking Override Voltage

Rev B

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