AH3774-P-A datasheet, PDF - EEWORLD Datasheet

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AH3774

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

Description

The AH3774 is a high-voltage, high-sensitivity Hall Effect Latch IC

designed for commutation of brushless DC motor, flow meters, linear

encoders and position sensors in industrial and consumer home

appliance and personal care applications. To support a wide range of

demanding applications, the design is optimized to operate over the

supply range of 3.0V to 28V. With chopper stabilized architecture and

an internal bandgap regulator to provide temperature compensated

supply for internal circuits, the AH3774 provides a reliable solution

over the whole operating range. For robustness and protection, the

device has a reverse blocking diode with a Zener clamp on the

supply. The output has an over current limit and a Zener clamp.

The single open-drain output can be switched on with South Pole of

sufficient strength and switched off with North Pole of sufficient

strength. When the magnetic flux density (B) perpendicular to the

package is larger than the operate point (Bop) the output is switched

on (pulled low). The output is held latched until magnetic flux density

reverses and becomes lower than the release point (Brp).

The magnetic operating and release polarity is opposite for SOT23

and SC59 packages. SOT23 and SIP-3 packages will require South

Pole to the part marking side to operate while SC59 will require South

Pole to the non-part marking side.

Pin Assignments

(Top View)

3 OUTPUT

GND 2

1 V

DD

SC59 and SOT23

(Top View)

3. OUTPUT

2. GND

1. V

DD

SIP-3

Features

•

Bipolar Latch (South Pole: On, North Pole: Off)

3.0V

to 28V Operating

Voltage Range

High Sensitivity: Bop and Brp of +40G and -40G Typical

Single Open Drain Output with Over Current Limit

Chopper Stabilized Design Provides

•

Superior Temperature Stability



Minimal Switch Point Drift



Enhanced Immunity to Stress

Good RF Noise Immunity

Reverse Blocking Diode and Zener Clamp on Supply

-40°C to +125°C Operating Temperature

ESD (HBM): 6kV

Industry Standard SC59, SOT23 and SIP-3 Packages

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)

Applications

•

Brushless DC Motor Commutation

Revolution Per Minute (RPM) Measurement

Flow Meters

Angular and Linear Encoder and Position Sensors

Contact-less Commutation, Speed Measurement and Angular

Position Sensing/Indexing in Consumer Home Appliances, Office

Equipments and Industrial Applications

•

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)

and <1000ppm antimony compounds.

AH3774

Document number: DS37899 Rev. 1 - 2

1 of 14

www.diodes.com

September 2015

AH3774

Typical Applications Circuit

3.0V to 28V

V

DD

R

L

C

IN

AH3774

OUTPUT

GND

Note:

4. C

IN

is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF.

R

L

is the pull-up resistor.

Pin Descriptions

Package: SC59, SOT23 and SOT23

Pin Number

1

2

3

Pin Name

V

DD

GND

OUTPUT

Power Supply Input

Ground

Output Pin

Function

Functional Block Diagram

V

DD

Power

switch

To All Subcircuits

Low-Pass Filter

Dynamic Offset

Cancellation

OUTPUT

Control

Sample and

Hold

Amp

Current

Limit

GND

AH3774

Document number: DS37899 Rev. 1 - 2

2 of 14

www.diodes.com

September 2015

AH3774

Absolute Maximum Ratings

(Notes 5 & 6) (@T

A

= +25°C, unless otherwise specified.)

Symbol

V

DD

V

DDR

V

OUT_MAX

I

OUT

I

OUT_R

B

P

D

Ts

T

J

ESD

Notes:

Characteristic

Supply Voltage (Note 6)

Reverse supply voltage

Output off voltage (Note 6)

Continuous output current

Reverse output current

Magnetic Flux Density

Package Power Dissipation

Storage Temperature Range

Maximum Junction Temperature

Electrostatic Discharge Withstand Capability - Human Body Model

SIP-3

SC59 and SOT23

Value

32

-32

32V

60

-50

Unlimited

550

230

-65 to +165

150

6

Unit

V

mA

mW

°C

kV

5. Stresses greater than the “Absolute Maximum Ratings” specified above may cause permanent damage to the device. These are stress ratings only;

functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be

affected by exposure to absolute maximum rating conditions for extended periods of time.

6. The absolute maximum V

DD

of 32V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to

operate the device at the absolute maximum rated conditions for any period of time.

Recommended Operating Conditions

(@T

A

= -40°C to +125°C, unless otherwise specified.)

Symbol

V

DD

T

A

Parameter

Supply Voltage

Operating Temperature Range

Operating

Conditions

Rating

3.0 to 28

-40 to +125

Unit

V

°C

Electrical Characteristics

Symbol

mW

I

OUT_OFF

I

DD

I

DD_R

t

ST

f

c

t

d

(Notes 7 & 8) (@T

A

= -40°C to +125°C, V

DD

= 3V

to 28V, unless

otherwise specified.)

Conditions

I

OUT

= 20mA, B > Bop

V

OUT

= 28V, B < Brp, Output Off

Output Open, T

A

= +25C

Output Open, T

A

= -40°C to +125°C

V

DD

= -18V, T

A

= -40°C to +125°C

V

DD

= -28V, T

A

= -40°C to +125°C

V

DD

>= 3V, B > Bop (Note 7)

V

DD

>= 3V

(Note 9)

—

R

L

=1kΩ, C

L

= 20pF

—

R

L

=1kΩ, C

L

= 20pF

B>Bop, (Note 10)

I

DD

= 5mA

30

28

0.1

—

1

55

—

µs

mA

V

0.2

1

µs

Min

—

Typ

0.2

<0.1

3

—

-0.01

10

800

3.75

Max

0.4

10

—

4

1

1.5

—

Unit

V

µA

mA

µs

kHz

µs

Parameter

Output On Voltage

Output Leakage Current

Supply Current

Reverse Battery Current

Device Start-Up Time

Chopping Frequency

The time delay from magnetic

threshold reached to the start of the

output rise or fall

Output Rising Time

(external pull-up resistor R

L

and load

capacitance dependent)

Output Falling Time

(Internal switch resistance and load

capacitance dependent)

Output Current Limit

Zener Clamp Voltage

t

r

t

f

I

OCL

V

Z

Notes:

7. When power is initially turned on, V

DD

must be within its correct operating range (3.0V to 28V) to guarantee the output sampling. The output state is valid

after the start-up time of 10µs typical

from the operating voltage reaching 3V.

8. Typical values are defined at T

A

= +25°C, V

DD

= 12V. Maximum and minimum values over the operating temperature range is not tested in production

but guaranteed by design, process control and characterization.

9. Guaranteed by design, process control and characterization, Not tested in production.

10. The device will limit the output current I

OUT

to current limit of I

OCL.

AH3774

Document number: DS37899 Rev. 1 - 2

3 of 14

www.diodes.com

September 2015

AH3774

Magnetic Characteristics

(Notes 11 & 12) (T

A

= -40°C to +125°C, V

DD

= 3.0V to 28V, unless otherwise specified) (1mT=10 Gauss)

Symbol

Parameter

Conditions

V

DD

= 12V, T

A

= +25°C

T

A

= -40°C to +125°C

V

DD

= 12V, T

A

= +25°C

Release Point

T

A

= -40°C to +125°C

V

DD

= 12V, T

A

= +25°C

Bhy (|Bopx|-|Brpx|)

Hysteresis (Note 13)

T

A

= -40°C to +125°C

Notes:

Min

—

20

—

-60

—

40

Typ

40

-40

80

Max

—

60

—

Unit

Bop (South Pole to part marking side for

SOT23 and SIP-3 packages);

Operation Point

South Pole to the non-part marking side

for SC59 package. See diagram below)

Brp (North Pole to part marking side for

SOT23 and SIP-3 packages;

North Pole to the non-part marking side

for SC59 package. See diagram below)

Gauss

-20

—

120

11. When power is initially turned on, V

DD

must be within its correct operating range (3.0V to 28V) to guarantee the output sampling. The output state is

valid after the start-up time of 10µs typical

from the operating voltage reaching 3V.

12. Typical values are defined at T

A

= +25°C, V

DD

= 12V. Maximum and minimum values over the operating temperature range is not tested in production

but guaranteed by design, process control and characterization.

13. Maximum and minimum hysteresis is guaranteed by design, process control and characterization.

Output

(off-state)

V

DD

( Output Voltage )

Bhy

Turn off

Turn on

(on-state)

V

OUT_ON

= V

OUT(SAT)

Brp

0

Bop

( Magnetic Flux Density B )

S

Part mark

S

Part mark

N

(SC59)

(SOT23)

(SIP-3)

AH3774

Document number: DS37899 Rev. 1 - 2

4 of 14

www.diodes.com

September 2015

AH3774

Typical Operating Characteristics

Magnetic Operating Switch Points – Bop and Brp

120.0

100.0

80.0

T

A

= +25

o

C

Hyst

Bop

120.0

100.0

80.0

60.0

V

DD

= 3V

Hyst

Gauss (G)

60.0

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

Bop

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

Brp

-100.0

-120.0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

-100.0

-50

-25

0

25

50

75

100

125

150

Supply Voltage (V)

Switch Points Bop and Brp vs Supply Voltage

Temperature (

o

C)

Switch Points Bop and Brp vs Temperature

120.0

100.0

80.0

60.0

V

DD

= 12V

Hyst

120.0

100.0

80.0

60.0

V

DD

= 28V

Hyst

Bop

Gauss (G)

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

Brp

Gauss (G)

40.0

20.0

0.0

-20.0

-40.0

-60.0

-80.0

Brp

-100.0

-50

-25

0

25

50

75

100

125

150

-100.0

-50

-25

0

25

50

75

100

125

150

Temperature (

o

C)

Switch Points Bop and Brp vs Temperature

Temperature (

o

C)

Switch Points Bop and Brp vs Temperature

Supply Current

5.0

4.0

T

A

= +25 C

Supply Current I

DD

(mA)

Supply Current I

DD

(mA)

3.8

3.5

28V

4.0

3.0

3.3

3.0

2.8

2.5

2.3

3V

12V

2.0

1.0

0.0

2

4

6

8

10

12

14

16

18

20

22

24

26

28

30

2.0

-50 -40 -30 -20 -10

0

10 20 30 40 50 60 70 80 90 100 110 120 130

Supply Voltage (V)

Supply Current vs Supply Voltage

Temperature (

o

C)

Supply Current vs Temperature

AH3774

Document number: DS37899 Rev. 1 - 2

5 of 14

www.diodes.com

September 2015

Parameter Name	Attribute value
Function	Bayonet
technology	Hall Effect
polarization	Antarctica
Sensing range	6mT trip, -6mT release
Test Conditions	-40°C ~ 125°C
Voltage - Power	3 V ~ 28 V
Current - Power (maximum)	4mA
Current - Output (maximum)	60mA
Output type	open drain
characteristic	Temperature compensation
Operating temperature	-40°C ~ 125°C（TA）
Package/casing	3-SIP module
Supplier device packaging	3-SIP

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