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SS30 Datasheet(PDF) 6 Page - Sanyo Semicon Device

Part No. SS30
Description  For Notebook PC Fan Motor Driver
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Maker  SANYO [Sanyo Semicon Device]
Homepage  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

SS30 Datasheet(HTML) 6 Page - Sanyo Semicon Device

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SS30
No.A1878-6/7
SS30 Functional Description and Notes on External Components
Read the following notes before designing driver circuits using the SS30 to design a system with fully satisfactory
characteristics.
1. Output drive circuit and speed control methods
The SS30 adopts the synchronous commutation PWM drive method to minimize power loss in the output circuits.
Low on-resistance DMOS devices (total high and low side on-resistance of output block: 1.2
Ω, typical) are used as the
output transistors.
The speed control of the driver is performed with an externally input PWM signal.
PWM controls the speed by performing switching in accordance with the duty cycle that is input to the PWM pin (pin
12). The output transistor is on when a high-level voltage is input to the PWM pin, and off when a low-level voltage is
input. When the motor is used with the PWM pin open, the built-in resistor causes the PWM pin to change to
high-level voltage and the motor speed rises to full speed. When the PWM pin is fixed at low-level voltage, the motor
decelerates, and after the motor stops it enters “Power Saving Mode.
2. Soft Switching Circuit
This IC adopts variable duty soft switching to minimize the motor drive noise.
3. Current limiter circuit
The current limiter circuit limits the output current peak value to a level determined by the equation I = VRF/RF (VRF
= 0.25V typical). The current limiter circuit detects the peak current of the output transistors at the RF pin (pin 16) and
turns off the transistor of the PWM phase.
4. OSC circuit
The OSC pin (pin 6) is an oscillation pin provided for sensor-less motor startup commutation. When a capacitor is
connected between the OSC pin and ground, the OSC pin starts self-oscillation, and this becomes the startup
frequency. The oscillator frequency can be adjusted by changing the value of the external capacitor (i.e. reducing the
value of the capacitor increases the startup frequency).
It is necessary to select a value of the capacitor that provides the optimal startup characteristics.
Please confirm the operation when starting without fail, and adjust the constant again when you change the
characteristic of the motor shape change and the motor (coil resistance, number of rolling lines, and magnetization,
etc.).
5. Position Detector Comparator Circuit for Rotor
The position detection comparator circuit for the rotor is a comparator for detecting rotor positional information with
the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies
current to the motor based on the position information obtained here. Insert a capacitor (between 1,000 and 10,000pF:
Reference value) between the COMIN pin (pin 4) and FIL (pin 5) to prevent any motor startup miss-operation that is
caused by the comparator input noise.
Please confirm the operation when starting without fail, and adjust the constant again when you change the motor
shape change and the motor characteristic (coil resistance, number of rolling lines, and magnetization, etc.) as well as
the capacitor of the OSC pin.
6. FG, 1/2FG Output Circuit
The FG pin (pin 10) and the 1/2FG pin (pin9) is the FG output pin.
The FG pin outputs the pulse of one hall corresponding, and the 1/2FG pin outputs the pulse of 1/2 hall corresponding.
Please use the pull-up resistor putting it because the FG pin and the 1/2FG pin are the open drain output compositions.
Please connect the power supply where the pull-up resistor is connected with the power supply on the side where the
FG signal is input. I will recommend about 10kΩ as resistance of the pull-up resistor.
7. RD (Lock detection) Output Circuit
The RD pin and (pin 11) are the RD output pin. Please use the pull-up resistor putting it because the RD pin is an open
drain output composition. Please connect the power supply where the pull-up resistor is connected with the power
supply on the side where the RD signal is input. About 10kΩ is recommended as resistance of the pull-up resistor.


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