AH5795-WU-7

NOT RECOMMENDED FOR NEW DESIGN USE AH9485/AH9486 AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Description Pin Assignments The AH5795 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. (Top View) Motor speed can be controlled by either changing the duty ratio of the PWM signal at the PWM pin or by varying the supply voltage at Vdd pin. FG 1 6 PWM Vss 2 5 Vdd O2 3 4 O1 To help protect the motor coil, the AH5795 provides Rotor Lock Protection which shuts down the 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. TSOT23-6 (Top View) 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. PWM 1 6 FG Vdd 2 5 O2 O1 3 4 Vss The AH5795 is available in space saving and low profile TSOT23-6 and DFN2020C-6 packages. Features • • • • • • • • • • • • Supports single-coil full-wave BLDC fan drivers Built-in Hall sensor and input amplifier Operating voltage: 1.8V to 6V Speed control methods o Vdd voltage speed control (PWM pin tied to Vdd) o PWM signal speed control via PWM pin Soft switching for low noise DC fan motor applications Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) Toff clear when PWM is low for greater than 65ms Thermal protection Tachometer (FG) output No external timing capacitor - Reduces the numbers of external components required Low profile package: TSOT23-6 and DFN2020C-6 “Green” Molding Compound (No Br, Sb) (Note 1) Notes: DFN2020C-6 Applications • • • • 3.3V / 5V BLDC Cooling Fans Netbook/ Notebook BLDC fans Instruments cooling fans Low Voltage/ Low Power BLDC Motors 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. AH5795 Document number: DS35277 Rev. 2 - 3 1 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Typical Application Circuit SYSTEM POWER D1 C1 10Kohm Dz Vdd PWM PWM signal for speed control FG AH5795 FG O1 O2 Vss Pin Descriptions Pin Name Description Vdd Power supply pin VSS O1 Ground pin Output driving & sinking pin O2 PWM FG AH5795 Notes: 2. The FG output is the same as the magnetic change frequency. Output driving & sinking pin PWM signal input pin for speed control Frequency Generator (Note 2) Document number: DS35277 Rev. 2 - 3 2 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Functional Block Diagram (Note 3) Vdd Power Lock Detect, Shutdown and Automatic Re-Start Frequency Generator O1 PWM Hall Sensor AMP Logic Block Vss Notes: FG Soft Switching Control Full Bridge Driver O2 3. The AH5795 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically a pull-up resistor of 10KΩ is recommended from FG pin to the supply voltage. AH5795 Document number: DS35277 Rev. 2 - 3 3 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Absolute Maximum Ratings (TA = 25°C, unless otherwise noted, Note 4) Symbol Vdd IO(PEAK) PD TST Supply voltage Maximum Output Current (Peak) Power Dissipation TSOT23-6 Values Unit 7 V 1000mA mA 650 DFN2020C-6 mW 780 (Note 5) Storage Temperature Range ESD HBM Notes: Characteristics o -65 ~ 150 Human Body Model (HBM) ESD Protection 4 C kV 4. 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 5. DFN2020C-6 exposed pad soldered to minimum recommended landing pads (see Package Outline Dimension section) on a two-layer 2oz. copper FR4 PCB (1.6mm thickness) with no thermal vias in exposed PADs or any copper flood connecting to the landing pattern of the exposed pad. Recommended Operating Conditions (TA = 25°C) Symbol VDD TA Parameter Supply Voltage Operating Ambient Temperature Range Conditions Operating Operating Min 1.8 -40 Max 6.0 105 Unit V o C Electrical Characteristics (TA = 25°C, VDD = 5V) Symbol IDD Characteristics Supply Current VOH Output Voltage High VOL Output Voltage Low Voh+Vol TSW ILEAK VFGOL TON RDR VPWMH VPWML IPWMH IPWMH FPWM DPWM_MIN Tj_SDN_TH Tj_SDN_HYST AH5795 Output voltage of N- and PMOS combined Output Switching Slope Duration FG Output Leakage Current FG Output Voltage Low On Time Duty Ratio PWM Input H Level PWM Input L Level PWM Input current H Level PWM Input current L Level PWM Input Frequency Output minimum duty ratio IC junction temperature thermal shutdown threshold IC junction temperature thermal shutdown hysteresis Document number: DS35277 Rev. 2 - 3 Conditions No Load IOUT = 300mA IOUT = 500mA IOUT = 300mA IOUT = 500mA IOUT = 300mA IOUT = 500mA 17Ω load on out1/out2 IFG = 5mA TOFF / TON PWM=Vdd PWM=GND Motor rotating; 4 of 13 www.diodes.com Min 4.70 4.5 - 350 0.5 Vdd 0 0.02 10% Typ. 2.2 4.88 4.8 0.12 0.2 0.3 0.5 200 500 10 0 -10 - Max 0.3 0.5 0.6 5 0.4 650 Vdd 0.14 Vdd 50 100 Unit mA V V V V V V μs μA V ms V V uA uA KHz % 175 o C 25 o C January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Magnetic Characteristics (TA = 25°C, Vdd = 1.8V~6V, Note 6) (1mT = 10 G) Symbol Parameter Min Typ. Max Bop Operate Point 10 25 50 Brp Release Point -50 -25 -10 Bhy Hysteresis - 50 - Notes: Unit Gauss 6. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering. Operating Characteristics O1 O2 VOH RP OFF ON OP Output Voltage in Volts Output Voltage in Volts VOH VOL Brp 0 OFF OP RP ON VOL Bop Brp Magnetic Flux Density in Gauss 0 Magnetic Flux Density in Gauss S N Marking side AH5795 Marking side N S (DFN2020C-6) (TSOT23-6) Document number: DS35277 Rev. 2 - 3 Bop 5 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Operating Characteristics (cont. Note 7, 8, 9 and 10) Magentic S N O2 O1 Ton FG Toff Mechanical lock Normal spinning motor locked detected Truth Table O1 L H L Notes: AH5795 O2 H L L PWM H H L “Re-start spinning” motor locked cleared FG L H X (Note 10) 7. In “Normal spinning, the FG changes its state at each edge of O1. 8. 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. 9. 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. 10. X: H or L depends on magnetic pole north or South Document number: DS35277 Rev. 2 - 3 6 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Application Note DC Supply voltage speed control Motor speed can be controlled by varying the Vdd supply voltage while PWM pin is tied to Vdd pin. For example, with 5V nominal motor, changing supply voltage between 5V to 1.8V, speed can be reduced from 100% to 36% typically. PWM speed control Motor speed can also be adjusted by applying a PWM speed control signal into the PWM pin while keeping the Vdd pin at nominal motor voltage. The motor speed is proportional to the PWM signal duty. For example, with 5V nominal motor, Vdd pin is maintained at 5V typical while varying the PWM control signal duty to adjust the motor speed linearly. Figure below shows the output O1 and O2 in relation to PWM speed control signal at PWM pin. S Magnetic Flux Density (B) N PWM O2 O1 FG Frequency of PWM speed control signal can be between 15Hz to 50kHz. Recommended typical PWM signal frequency is 25kHz to keep switching frequency away from audible band. If PWM signal level at PWM pin stays low for longer than 65ms typical, the outputs are disabled. Depending on the motor design and its inertia, minimum start-up PWM duty required can be typically between 30% - 40% while minimum running PWM duty can be down to 20%-25% typical. If voltage at Vdd is lower than the nominal motor voltage, both start-up PWM duty and minimum running PWM duty required will be higher. AH5795 Document number: DS35277 Rev. 2 - 3 7 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Application Note (cont.) Rotor lock Toff and PWM signal When PWM signal input at PWM pin is low for longer than 65ms, internal rotor lock protection Toff is cleared. This allows the device to enter motor start Ton time on the next PWM high signal PWM 65ms (max) Rotor lock protection (internal signal) Enabled Disabled (Toff cleared) Enabled Soft Switching AH5795 uses soft switching of the motor coil current during commutation for to minimize audible switching noise and electromagnetic interference (EMI) to provide a low noise solution. Vdd Vout 1 Vout 2 Vss AH5795 Document number: DS35277 Rev. 2 - 3 200µs typ. 8 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Thermal Performance Characteristics (1) TSOT23-6 TA (°C) 25 50 60 70 75 80 85 90 95 100 PD (mW) TA (°C) 651 105 521 110 469 115 417 120 391 125 365 130 339 135 313 140 286 145 260 150 PD (mW) 234 208 182 156 130 104 78 52 26 0 PD (mW) Power Dissipation Curve 700 650 600 500 400 300 200 100 0 0 -40 25 50 75 100 105 125 150 TA (°C) (2) DFN2020C-6 (Note 11) TA (°C) 25 50 60 70 75 80 85 90 95 100 PD (mW) 781 625 563 500 469 438 406 375 344 313 TA (°C) 105 110 115 120 125 130 135 140 145 150 PD (mW) 281 250 219 188 156 125 94 63 31 0 PD (mW) Power Dissipation Curve 900 800 700 600 500 400 300 200 100 0 0 -40 25 50 75 100 105 125 150 TA (°C) Notes: 11. DFN2020C-6 exposed pad soldered to minimum recommended landing pads (see Package Outline Dimension section) on a two-layer 2oz. copper FR4 PCB (1.6mm thickness) with no thermal vias in exposed PADs or any copper flood connecting to the landing pattern of the exposed pad. AH5795 Document number: DS35277 Rev. 2 - 3 9 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Ordering information AH 5795 - XXX - 7 Device Packing WU : TSOT23-6 FDC : DFN2020C-6 7 : Tape & Reel 7” Tape and Reel Part Number Suffix Package Code Packaging (Note 12 & 13) Quantity WU FDC TSOT23-6 DFN2020C-6 3000/Tape & Reel 3000/Tape & Reel AH5795-WU-7 AH5795-FDC-7 Notes: Package -7 -7 12. 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 13. 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) TSOT23-6 (Top View) 4 7 5 6 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 XX Y W X 1 2 3 Part Number Package Identification Code AH5795-WU-7 TSOT23-6 J5 (2) DFN2020C-6 ( Top View ) XX YWX AH5795 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 Part Number Package Identification Code AH5795-FDC-7 DFN2020C-6 J5 Document number: DS35277 Rev. 2 - 3 10 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Package Outline Dimensions (All Dimensions in mm) (1) Package type: TSOT23-6 (2) Package Type: DFN2020C-6 0.6±0.1 0.43mon. 1.0±0.1 Pin#1 0.15max. 0.10 C B 2x- 6x-0.37 A Hall Sensor 0.25/0.35 15 0.86/1.06 1.95/2.075 R 0. 1.95/2.075 1.55/1.75 Seating plane C 6x-0.45 0.25 A Pin#1 ID 2x 0/0.05 0.08 C (Active area depth) 0.9 0.57/0.63 Hall Sensor locator 0.65 1 R 0. 1.59 0.25 B 0.65nom. 0.25/0.35 0.10 M C A B Land Pattern Recommendation (Unit:mm) Top View Bottom View AH5795 Document number: DS35277 Rev. 2 - 3 11 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Taping Orientation For DFN2020C-6 Notes: 14. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf. AH5795 Document number: DS35277 Rev. 2 - 3 12 of 13 www.diodes.com January 2021 © Diodes Incorporated AH5795 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER IMPORTANT NOTICE 1. DIODES INCORPORATED AND ITS SUBSIDIARIES (“DIODES”) MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes products. Diodes products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of the Diodes products for their intended applications, (c) ensuring their applications, which incorporate Diodes products, comply the applicable legal and regulatory requirements as well as safety and functional-safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality control techniques, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications. 3. Diodes assumes no liability for any application-related information, support, assistance or feedback that may be provided by Diodes from time to time. Any customer or user of this document or products described herein will assume all risks and liabilities associated with such use, and will hold Diodes and all companies whose products are represented herein or on Diodes’ websites, harmless against all damages and liabilities. 4. Products described herein may be covered by one or more United States, international or foreign patents and pending patent applications. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks and trademark applications. Diodes does not convey any license under any of its intellectual property rights or the rights of any third parties (including third parties whose products and services may be described in this document or on Diodes’ website) under this document. 5. Diodes products are provided subject to Diodes’ Standard Terms and Conditions of Sale (https://www.diodes.com/about/company/terms-and-conditions/terms-and-conditions-of-sales/) or other applicable terms. This document does not alter or expand the applicable warranties provided by Diodes. Diodes does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. 6. Diodes products and technology may not be used for or incorporated into any products or systems whose manufacture, use or sale is prohibited under any applicable laws and regulations. Should customers or users use Diodes products in contravention of any applicable laws or regulations, or for any unintended or unauthorized application, customers and users will (a) be solely responsible for any damages, losses or penalties arising in connection therewith or as a result thereof, and (b) indemnify and hold Diodes and its representatives and agents harmless against any and all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim relating to any noncompliance with the applicable laws and regulations, as well as any unintended or unauthorized application. 7. While efforts have been made to ensure the information contained in this document is accurate, complete and current, it may contain technical inaccuracies, omissions and typographical errors. Diodes does not warrant that information contained in this document is error-free and Diodes is under no obligation to update or otherwise correct this information. Notwithstanding the foregoing, Diodes reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes. 8. Any unauthorized copying, modification, distribution, transmission, display or other use of this document (or any portion hereof) is prohibited. Diodes assumes no responsibility for any losses incurred by the customers or users or any third parties arising from any such unauthorized use. Copyright © 2021 Diodes Incorporated www.diodes.com AH5795 Document number: DS35277 Rev. 2 - 3 13 of 13 www.diodes.com January 2021 © Diodes Incorporated