Datasheet > NR885K

NR885K

更新时间： 2024-11-02 10:37:47

品牌	Logo	应用领域
三垦 - SANKEN		开关
页数	文件大小	规格书
2页	56K
描述
Surface-Mount, Current Mode Control, Synchronous Rectifier Step-down Switching Mode

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中文翻译

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数据手册

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NR885K 数据手册

1-1-3 DC/DC Converter ICs

NR885K Surface

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■Features

■Absolute Maximum Ratings

Parameter

Input Voltage

Symbol

VIN

Ratings

Unit

Conditions

• Compact surface-mount package (HSOP8)

• Input voltage range (VIN): VO + 3 to 18 V

• Synchronous rectifier mode

1.69

When mounted on 30 × 30 mm glass-epoxy board (with a 25 × 25 mm copper area)

When mounted on a 30 × 30 mm glass-epoxy board (with a 25 × 25 mm copper area)

Power Dissipation

Junction Temperature

–40 to +150

°C

• High efficiency: 90%

Storage Temperature

Tstg

θj-c

–40 to +150

°C

Thermal Resistance (Junction to Lead (4 pins))

Thermal Resistance (Junction to Ambient Air)

°C/W

• Introduction of current mode control method

• A ceramic capacitor can be used for output

• Built-in phase correction component

• Output current: 3 A

θj-a

■Recommended Operating Conditions

• Reference voltage and accuracy of 0.8 V ± 2%

• Oscillation frequency: 350 kHz

• Output ON/OFF available

Parameter

Symbol

VIN

Ratings

Unit

Input Voltage Range

4.5 or VO + 3* to 18

0 to 3.0

Output Current Range

Output Voltage Range

Operating Temperature Range

0.8 to 14

• Undervoltage lockout

Top

–40 to +85

°C

• Soft start function

*: The minimum value of the input voltage range is 4.5 V or V^O+ 3 V, whichever is higher.

■Applications

• Power supply for LCDTV and PDP

• Power supply for DVD, BD, and STB

• On-board local power supply

• Power supply for LBP and PPC

■Electrical Characteristics

(Ta=25°C, VIN=12V, VO=3.3V, and Io=1A, unless otherwise specified)

Unit Conditions

Ratings

typ.

Parameter

Symbol

min.

max.

Reference Voltage

VREF

⊿VREF/⊿T

0.784

280

3.1

0.800

±0.05

0.816

mV/℃

Temperature Coefficient of Reference Voltage

Efficiency

Ta=–40℃ to +85℃

Oscillation Frequency

Line Regulation

350

420

6.0

kHz

VLINE

VLoad

VIN=6.3V to 18V

Io=0.1A to 3A

Load Regulation

Overcurrent Protection Starting Current

Quiescent Circuit Current 1

Quiescent Circuit Current 2

IIN

µA

VEN=3V

IIN(off)

IEN/SS

VSSH

IEN

Io=0A, VEN=0V

VSS=0V

Outflow Current at Low Voltage

SS Pin

3.0

Open Voltage

Inflow Current

100

2.1

µA

VEN=10V

EN Pin

On Threshold Voltage

VC/EH

DMAX

DMIN

TSD

0.7

151

1.4

Maximum ON Duty

Minimum ON Time

150

165

nsec

℃

Thermal Protection Start Temperature

Thermal Protection Return Hysteresis

TSD_hys

*: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin.

The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.

NR885K

ꢀSoft start

ICs

中文翻译

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