WSH411 Hall Effect Sensor IC with Thermal Lock Protection and Auto Restart Function Features: Operate from 2.8V to 20V supply voltage. On-chip Hall sensor. Internal bandgap regulator allows temperature compensated operations and a wide operating voltage range. High output sinking capability up to 500mA for driving large load. Lower current change rate reduces the peak output voltages during switching. Available in rugged low profile SOT-25 , SIP-4L packages. Built-in FG output. Built-in protection diode for reverse power supply fault. Built-in thermal lock protection and auto-restart function. General Description: WSH411 is designed to integrate Hall sensor with complementary output drivers and frequency generator together on the same chip, it is suitable for speed measurement, revolution counting, positioning, and DC brushless motors. It includes a temperature compensated voltage regulator, a differential amplifier, a Hysteresis controller, two open-collector output drivers capable of sinking 1A current load and an open-collector frequency generator capable of sinking 10mA current load. An on-chip protection diode is implemented to prevent reverse power fault. And built-in thermal lock protection and auto-restart function is suitable for super high speed fan. It can replace the function of lock protection and auto restart function. The power will be shutdown automatically at 135°C to prevent the coils be damaged and atuo-restart after cooling down. The temperature-dependent bias increases the supply voltage of the hall plates and adjusts the switching points to the decreasing induction of magnets at higher temperatures. Subsequently, the open collector output switches to the appropriate state. WSH411 are rated for operation over temperature range from –20˚ C to 100˚C and voltage ranges from 2.8V to 20V. Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 1 WSH411 Name VDD Vss FG OUT2 OUT1 P/I/O P P O O O Pin# Description Positive Power Supply Ground Frequency Generator Output Pin 2 Output Pin 1 Name Vcc OUT1 OUT2 Vss P/I/O P O O P Pin# Description Positive Power Supply Output Pin #1 Output Pin #2 Ground Name Vcc OUT1 OUT2 FG Vss P/I/O P O O O P Pin# Description Positive Power Supply Output Pin #1 Output Pin #2 Frequency Generator Ground Supply Voltage Vcc -------------------------- 20V Output / FG breakdown Voltage Vout/Vfg --------------------- 25V Magnetic flux density B -------------------------- Unlimited Reverse Protection Voltage Output Current continuous Vr Ic --------------------------------------------------- 20V 300mA Hold current Peak current Ih Ip ------------------------------------------------ 500mA 1.2A FG ON Current (continuous) Operating Temperature Range If Ta --------------------------------------------------- 20mA (-20˚C to +100˚C) Storage Temperature Range Package Power Dissipation Ts -------------------------Pd -------------------------- (-65˚C to +150˚C) 350mw for SOT-25 500mw for SIP-4L SIP-5L Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 2 WSH411 Characteristic Supply Voltage Output Saturation Voltage FG Saturation Voltage Output Leakage Current Supply Current (T=+25˚C, Vcc=2.8V to 20V) Symbol Test Conditions Min Typ Max Units Vcc V Vout(sat) Vcc=20V, Ic=200mA V B > Bop Vfg(sat) Vcc=20V, If=10mA V B > Bop Ileakage Vcc=20V, B < Brp uA < Isupply Vcc=20V, Output & FG Open Output / FG Rising Tr Vcc=12V, RL=820 Time CL=20Pf Output / FG Falling Tf Vcc=12V, RL=820 Time CL=20Pf Output / FG Time t Vcc=12V, RL=820 Differential CL=20Pf mA 3.0 Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 3 us us us WSH411 Characteristics Symbol Operate Point Bop Release Point Brp Hysteresis Window Quantity Grade A Grade B Grade C Grade A Grade B Grade C Bop-Brp Ta= -20˚C to +100˚C Typ. 25 30 50 -70 -25 -100 -30 -120 -50 Min 40 SIP- 4L: WSH411-XPA SIP- 5L: WSH411-XPC Elec. Grade SIP-4L & SIP-5L: SOT-25: WSH411-XPD 1: A Grade (50 Gauss) 2: B Grade (70 Gauss) Elec. Grade 3: C Grade (120 Gauss) SOT-25: 1: A Grade (50 Gauss) 2: B Grade (70 Gauss) Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 4 Unit Max 50 70 120 Gauss Gauss 200 Gauss WSH411 SIP-4L SIP-5L Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 5 WSH411 SOT-25 Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 6 WSH411 SOT-25 Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 7 WSH411 SIP-4L Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 8 WSH411 SIP-5L Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 9 WSH411 SOT-25 Figure 1. SIP-4L Figure 2. Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 10 WSH411 SIP-5L Figure 3. Winson reserves the right to make changes to improve reliability or manufacturability. ©Winson, 2005/8/12 11