RT8283B 데이터 시트보기 (PDF) - Richtek Technology

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RT8283B

3A, 23V, 1.2MHz Synchronous Step-Down Converter

Richtek Technology 

RT8283B

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

0

Current Limit vs. Duty Cycle

10 20 30 40 50 60 70 80

Duty Cycle (%)

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

-50

Current Limit vs. Temperature

VIN = 12V, VOUT = 3.3V

-25

0

25 50 75 100 125

Temperature (°C)

Output Current Limit vs. Input Voltage

6.0

5.5

5.0

4.5

4.0

VOUT = 1.2V

3.5

VOUT = 3.3V (Add Bootstrap Diode)

3.0

VOUT = 3.3V

2.5

2.0

1.5

1.0

0.5

0.0

4 6 8 10 12 14 16 18 20 22 24

Input Voltage (V)

VOUT

(50mV/Div)

IOUT

(2A/Div)

Load Transient Response

Load Transient Response

VIN = 12V, VOUT = 3.3V, IOUT = 0A to 3A

Time (100μs/Div)

Switching

VOUT

(50mV/Div)

IOUT

(2A/Div)

VOUT

(5mV/Div)

VSW

(10V/Div)

VIN = 12V, VOUT = 3.3V, IOUT = 1.5A to 3A

Time (100μs/Div)

IL

(2A/Div)

VIN = 12V, VOUT = 3.3V, IOUT = 3A

Time (500ns/Div)

DS8283B-01 March 2011

www.richtek.com

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