SDC281Z4-G1 [SDC]

Smart Two-Phase DC Fan Driver;


型号：	SDC281Z4-G1
厂家：	Shaoxing Devechip Microelectronics Co., Ltd
描述：	Smart Two-Phase DC Fan Driver
文件：	总10页 (文件大小：265K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Datasheet

Smart Two-Phase DC Fan Driver

General Description

SDC281

Features

The SDC281 is a two-phase brushless DC fan motor driver,

which is built in Hall effect sensor. The driver includes lock

detection and auto-restart functions. The built-in chopper

amplifier can dynamically adjust the input offset voltage.

It greatly improves the sensitivity of the magnetic. The

output uses the soft-switch that greatly reduces the

phase-switch noise. The power switch is application in

advanced LDMOS technology to effectively reduce the

on-resistance. The peak current is highly to 1200mA.



Widely operating voltage range: 2.5V~20V

High output peak current to 1200mA

Continuous output current to 600mA

High sensitivity Hall effect sensor IC: ±25GS

Soft-switch to reduce phase-switch noise

Built-in output protection clamping circuit

Built-in lock detection and auto-restart functions

Built-in thermal shutdown protection

Reverse voltage protection

Applications



Brushless DC fan motors

Brushless DC motors

TO-94

Figure 1. Package Type

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Datasheet

Smart Two-Phase DC Fan Driver

Pin Configuration

SDC281

Package: TO-94

1.VDD

2.DO

3.DOB

4.GND

1 2 3 4

Figure 2. Pin Configuration

Pin Number

Pin Name

VDD

Functions

Power supply pin

Output 1 pin

Output 2 pin

Ground pin

DOB

GND

Table 1. Pin Description

Functional Block Diagram

VDD

Voltage

Clamp

Regulator

Hall

Plane

Logic Control

Citcuit

Voltage

Clamp

DOB

Oscillator

GND

Figure 3. Functional Block Diagram

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Datasheet

Smart Two-Phase DC Fan Driver

Ordering Information

SDC281

E1: Pb-free

G1: Halogen-free

Circuit Type

Package

TO-94: Z4

Part Number

Marking ID

Temperature

Package

Packing Type

Range

Pb-free

Halogen-free

Pb-free

281

Halogen-free

281G

TO-94

-40°C~85°C

SDC281Z4-E1

SDC281Z4-G1

Bulk

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Absolute Maximum Ratings (Note: Stresses greater than those listed under absolute maximum ratings may cause

permanent damage to the device.)

Parameter

Symbol

V_DD

Value

Unit

Supply voltage

Magnetic flux density

Continuous

Hold

700

Output current

I_OUT

900

Peak

1200

-65 to 150

550

Storage temperature range

Package power dissipation

Maximum junction temperature

T_S

P_D

°C

T_J

150

ESD,HBM model per MIL-STD-883H Method 3015.8

ESD,MM model per JEDEC EIA/JESD22-A115

Latch-up per JEDEC78

HBM

2000

200

Table 2. Absolute Maximum Ratings

Recommended Operating Conditions

Parameter

Symbol

V_DD

Conditions

Min

Max

Unit

Supply voltage

2.5

Operating temperature range

Max operating current1

Max operating current2

Max operating current3

-40

°C

I_OUT1

I_OUT2

I_OUT3

V_DD=5V

V_DD=12V

V_DD=18V

600

450

200

Table 3. Recommended Operating Conditions

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Electrical Characteristics (Ta=25°C, V_DD=12V, unless otherwise specified)

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

I_DD1

V_DD=2.5V,output open

Supply current

I_DD2

V_DD=20V,output open

Output saturation voltage

Output clamp voltage

V_SAT

V_DD=12V, I_OUT=300mA

200

300

200

V_OUT-CLAMP

I_DOL

I_DOBL

t_ON

V_DD=12V,output off

Leakage current of DO

Leakage current of DOB

Lock detection on time

Lock detection off time

Over temperature shutdown

Temperature hysteresis

V_DO=12V, B<B_RP

120

0.45

3.2

165

V_DOB=12V, B>B_OP

t_OFF

T_OTS

°C

Table 4. Electrical Characteristics

Magnetic Characteristics (Ta=25°C, V_DD=12V, unless otherwise specified)

Parameter

Symbol

Min

Typ

Max

Unit

Operating point

B_OP

-10

Release point

Hysteresis

B_RP

-40

-25

B_Hys

Table 5. Magnetic Characteristics

V_DOB

V_DO

Off-state

B_H

Off-state

B_H

On-state

B_RP

B_OP

B_RP

B_OP

Figure 4. Magnetic Characteristics

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Typical Operating Characteristics

2.5

2.0

1.5

1.0

2.0

V_DD=3V

1.5

1.0

V_DD=5V

V_DD=12V

0.5

-40 -20

160

20 40 60 80 100 120 140

10 12 14 16 18 20

Supply Voltage(V)

Ta(°C)

Figure 5. Supply Current vs. Supply Voltage

Figure 6. Supply Current vs. Temperature

B_OP

B_RP

B_OP

B_RP

-10

-20

-30

-20

-30

80 100 120

140 160

-40 -20

20 40 60

10 12 14 16 18 20

Supply Voltage(V)

Ta(°C)

Figure 7. Magnetic Flux Density vs. Supply Voltage

Figure 8. Magnetic Flux Density vs. Temperature

Pd(mW)

700

1.0

0.8

0.6

0.4

0.2

600

550

500

400

300

200

100

200

400

600

1000

800

Output Cureent (mA)

75 100

125 150 Ta(°C)

Figure 9. Output Saturation Voltage vs. Output Current

Figure 10. Power Dissipation Curve

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Function Description

marking surface and the magnetic flux density higher

than operating point(B_OP), the DO pin output will turn

ON and the DOB pin output will turn OFF. When the

south pole magnetic field is far away the IC marking

surface and the north pole magnetic field close to the

magnetic flux density until the magnetic flux density

higher than releasing point(B_RP), the DOB pin output will

turn ON and the DO pin output will turn OFF.

Lock Detection and Auto-restart

SDC281 detects the rotation of the motor by internal

Hall sensor signal, and adjusts lock detection ON time

(t_ON) and lock detection OFF time (t_OFF) by internal

counter.

VDD

B_OP

B_RP

Making Surface

Marking Surface

DOB

Start-up

Spining

Nomal

Spining

Start-up

Spining

Nomal

Spining

t_ON

t_OFF

V_DO

Figure 11. Lock Detection and Auto-restart Waveform

Thermal Protection

SDC281 has a thermal protection. When the internal

junction temperature reaches 165°C, the output devices

will be switched off. When the IC’s junction temperature

cools by 30°C, the thermal sensor will turn the output

devices on again, resulting in a pulse output during

continuous thermal protection.

B_RP

B_OP

B_RP

B_OP

V_DOB

Output Switch Principle

SDC281 built in a Hall-effect sensor plane to sense the

vertical magnetic flux density (B).There are two output

drivers in SDC281 to drive two-phase DC brushless motor.

When the south pole magnetic field is close to the IC

B_RP

B_OP

B_RP

B_OP

Figure 12. Output Switch Principle

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Typical Application

VCC

SDC281

GND

DOB

Figure 13. Typical Application at V_DD=12V

VCC

SDC281

GND

DOB

Figure 14. Recommended Typical Application at V_DD=12V

Note: the typical R is 5Ω, and the typical C is 2.2uF.

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Package Dimension

TO-94

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min

Max

1.800

0.900

0.550

0.510

5.350

4.850

3.750

Min

Max

0.071

0.035

0.022

0.020

0.214

0.194

0.148

1.400

0.700

0.380

0.360

5.050

4.550

3.450

0.055

0.028

0.015

0.014

0.202

0.128

0.136

1.270 TYP.

10°TYP.

0.050 TYP.

10°TYP.

14.300

14.700

0.572

0.588

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Datasheet

Smart Two-Phase DC Fan Driver

SDC281

Shaoxing Devechip Microelectronics Co., Ltd.

UUUhttp://www.sdc-semi.com/UUU

IMPORTANT NOTICE

Information in this document is provided solely in connection with Shaoxing Devechip Microelectronics Co., Ltd. (abbr. SDC) products.

SDC reserves the right to make changes, corrections, modifications or improvements, to this document, and the products and services

described herein at anytime, without notice. SDC does not assume any responsibility for use of any its products for any particular

purpose, nor does SDC assume any liability arising out of the application or use of any its products or circuits. SDC does not convey

any license under its patent rights or other rights nor the rights of others.

Headquarters of Shaoxing

Address: Tian Mu Road, No13,

Shaoxing city, Zhejiang province, China

Zip code: 312000

Shenzhen Branch

Address: 22A, Shangbu building, Nan Yuan Road, No.68,

Futian District, Shenzhen city, Guangdong province, China

Zip code: 518031

Tel: (86) 0575-8861 6750

Tel: (86) 0755-8366 1155

Fax: (86) 0575-8862 2882

Fax: (86) 0755-8301 8528

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