View AH57981002_4595432.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Description
The AH5798 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. To help protect the motor coil, the AH5798 provides Rotor Lock Protection which shuts down output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. The AH5798 is available in space saving SOT89-5L and thinner TSOT25 packages.
Pin Assignments
( Top View )
Vdd 1 Vss 2 5 FG NC 7 O2 4
O1 3
SOT89-5L
( Top View)
FG Vss O2
1 2 3 4 5
Vdd
O1
Features
TSOT25
* * * * * * * * * * Supports single-coil full-wave DC fan drivers Built-in Hall sensor and input amplifier Operating Voltage: 1.8V to 5.5V Soft switching for low noise DC fan motor applications Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) Thermal protection Tachometer (FG) output No external timing capacitor - Reduces the numbers of external components required Low profile packages: SOT89-5L and TSOT25 "Green" Molding Compound
Applications
* * * 3.3V / 5V Min. BLDC Cooling Fans Netbook/ Notebook BLDC fans Low Voltage/ Low Power BLDC Motors
AH5798
Document number: DS32001 Rev. 2 - 2
1 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Typical Application Circuit
SYSTEM POWER
10Kohm
SYSTEM POWER
Vdd D1 C1 Dz
FG
FG
AH5798
O1
O2 V SS
* Reverse connection of power supply may damage the device. To prevent reverse power damage, a protection (reverse blocking) Diode D1 is needed between power supply and Vdd terminal. If a reverse power protection diode D1 is used, there is no current return path to power supply, so it is necessary to follow measures such as below. - Connect Dz (Zener diode) between Vdd and Vss terminal, to prevent voltage exceeding the absolute maximum rating of the device. - Connect a capacitor C1 between Vdd and Vss terminal, to complete the current return path to power supply. The AH5798 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically, a pull-up resistor of 10k is recommended from FG pin to the supply voltage.
Pin Descriptions
Pin Name Vdd Vss O1 O2 NC FG
Notes:
Description Power Supply Pin Ground Pin Output Driving & Sinking Pin 1 Output Driving & Sinking Pin 2 No Connection Frequency Generator (Note 1)
1. The FG is the same as the magnetic change frequency.
AH5798
Document number: DS32001 Rev. 2 - 2
2 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Functional Block Diagram
Vdd
Power Frequency Generator
FG
O1
Hall Sensor AMP Control Logic Soft Switching Control Full Bridge Driver
O2
Vss
Lock detect, Shoutdown and Automatic re-start
Operating
Magentic
S N
O2 O1
FG Normal spinning
Ton
Toff Mechanical lock "Re-start spinning" motor locked cleared
motor locked detected
Notes:
2. In "Normal spinning", the FG changes its state at each rising edge of O1. 3. When the motor locks with South pole at the Hall element, O2 is kept on "L" and O1 is a clock with Ton/Toff ratio. When motor locks with North pole at the Hall element, O1 is kept on "L", O2 is a clock with Ton/Toff ratio. 4. When "Re-start spinning" occurs, the motor speed ramps up to the "Normal Spinning" speed from zero. Speed ramp-up profile depends on motor characteristics.
AH5798
Document number: DS32001 Rev. 2 - 2
3 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Soft Switching
AH5798 employs soft switching of output drive at commutation to reduce audible noise and EMI for low noise applications.
Vdd Vout 1
Vout 2 GND 100s typ.
Absolute Maximum Ratings (TA = 25C, unless otherwise noted)
Symbol Vdd IO(PEAK) PD TST Parameter Supply voltage Maximum Output Current (Peak) Power Dissipation Storage Temperature Range Thermal Resistance Junction-to-Ambient (Note 5)
TA TJ Tc
SOT89-5L TSOT25 SOT89-5L TSOT25
JA
Rating 6 800 800 520 -65 ~ 150 156 240
Unit V mA mW mW o C o C/W o C/W
JA JC
Notes:
5. JA should be confirmed with heat sink thermal resistance. If there is no heat sink contact, JA will almost be the same as JC.
Recommended Operating Conditions (TA = 25C)
Symbol Vdd TA AH5798
Document number: DS32001 Rev. 2 - 2
Parameter Supply Voltage Operating Ambient Temperature Range
Conditions Operating Operating
Min 1.8 -40
Max 5.5 105
Unit C V
June 2010
(c) Diodes Incorporated
4 of 11 www.diodes.com
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Electrical Characteristics (TA = 25C, Vdd = 5V)
Symbol Parameter Test Conditions Min Typ. Max Unit
Idd VOH VOL TSW ILEAK VFGOL TON RDR
Supply Current Output Voltage High Output Voltage Low Output Switching Slope Duration FG Output Leakage Current FG Output Voltage Low On Time Duty Ratio
No Load IOUT = 300mA IOUT = 300mA 50 load on out1/out2 IFG = 5mA TOFF / TON
4.4 350 -
5 4.65 0.35 100 500 10
0.6 5 0.4 650 -
mA V V s A V ms
Magnetic Characteristics (TA = 25C, Vdd = 1.8V~5V, Note 6)
(1mT = 10 G) Max Unit 50 -10 G G G
Symbol Bop Brp Bhy
Notes:
Parameter
Min 10 -50 -
Typ. 25 -25 50
Operate Point Release Point Hysteresis
6. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
AH5798
Document number: DS32001 Rev. 2 - 2
5 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Operating Characteristics
O1 VOH Output Voltage in Volts RP OFF Output Voltage in Volts OFF OP O2 VOH
ON
OP VOL Brp 0 Bop
RP VOL Brp 0 Bop
ON
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
S
Marking side
N
Marking side
N
(SOT89-5L)
S
(TSOT25)
AH5798
Document number: DS32001 Rev. 2 - 2
6 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Performance Characteristics
(1) SOT89-5L TA (C) PD (mW) TA (C) PD (mW)
25 800 105 288
50 640 110 256
60 576 115 224
70 512 120 192
75 480 125 160
80 448 130 128
85 416 135 96
90 384 140 64
95 352 145 32
100 320 150 0
P D (m W )
900 800 700 600 500 400 300 200 100 0 -40 0 25
Pow er D iss ipation C urve
50
75
10 0 105
125
1 50
T A (C )
(2) TSOT25 TA (C) PD (mW) TA (C) PD (mW)
25 520 105 188
50 417 110 167
60 375 115 146
70 333 120 125
75 313 125 104
80 292 130 83
85 271 135 63
90 250 140 42
95 230 145 21
100 208 150 0
P D (m W )
60 0 52 0 50 0 40 0 30 0 20 0 10 0 0 -40 0 25
Pow er Diss ipation C urv e
50
75
10 0 1 05
12 5
150
T A (C)
AH5798
Document number: DS32001 Rev. 2 - 2
7 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Ordering Information
AH 5798 - XX G - X
Package Y : SOT89-5L WT : TSOT25
Device AH5798-YG-13 AH5798-WTG-7
Notes:
Green
Packing 7/13 : Tape & Reel
G : Green
Package Code Y WT
Packaging (Note 7 & 8) SOT89-5L TSOT25
7"/13" Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 3000/Tape & Reel -7
7. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf 8. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html
Marking Information
(1) SOT89-5L
(Top View)
5 4 7
XX Y W X
1
2
3
XX : Identification code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code A~Z : Green
Identification Code K4
Part Number AH5798-YG (2) TSOT25
Package SOT89-5L
(Top View)
5 4 7
XX Y W X
1 2 3
XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green
Package TSOT25 Identification Code K4
June 2010
(c) Diodes Incorporated
Part Number AH5798-WTG AH5798
Document number: DS32001 Rev. 2 - 2
8 of 11 www.diodes.com
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm)
(1) Package type: SOT89-5L
Sensor Location
AH5798
Document number: DS32001 Rev. 2 - 2
9 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Package Outline Dimensions (Continued)
(2) Package type: TSOT25
Sensor Location
AH5798
Document number: DS32001 Rev. 2 - 2
10 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated
AH5798
SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2010, Diodes Incorporated www.diodes.com
AH5798
Document number: DS32001 Rev. 2 - 2
11 of 11 www.diodes.com
June 2010
(c) Diodes Incorporated

▲Up To Search▲

Price & Availability of AH57981002

	To Download AH57981002 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .