NCP1547(2007) 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1547
(Rev.:2007)

1.5 A, 340 kHz, Buck Regulator with Synchronization Capability

ON Semiconductor 

NCP1547

ELECTRICAL CHARACTERISTICS (continued) (0°C < TJ < 70°C, 4.5 V< VIN < 40 V; unless otherwise specified.)

Characteristic

Test Conditions

Min

Typ

Max

General

Quiescent Current

Shutdown Quiescent Current

Boost Operating Current

Minimum Boost Voltage

ISW = 0 A

VSHDNB = 0 V

VBOOST − VSW = 2.5 V

(Note 4)

−

4.0

7.5

−

1.0

5.0

6.0

15

40

−

−

2.5

Startup Voltage

−

2.2

3.3

4.4

Minimum Output Current

−

4. Guaranteed by design, not 100% tested in production.

−

7.0

12

Unit

mA

mA

mA/A

V

V

mA

SHDNB

SYNC

VIN

2.9 V LDO

Voltage

Regulator

Shutdown

Comparator

+

−

+

1.3 V −

5.0 mA

Artificial

Ramp

SHDNB

1.46 V

∑

+

−

PWM

Comparator

Oscillator

Thermal

Shutdown

SQ

R

Output

Driver

Current

Limit

Comparator

IREF

−

VFB

−

+

+

0.32 V

+

−

Frequency IFOLDBACK

and Current

1.27 V

+

−

Error

Amplifier

Limit Foldback

VC

Figure 2. Block Diagram

BOOST

VSW

GND

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