datasheetbank_Logo
Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site

M54670P View Datasheet(PDF) - Renesas Electronics

Part Name
Description
View to exact match
M54670P
Renesas
Renesas Electronics Renesas
M54670P Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
M54670P
(2) I0, I1
I0 and I1 fixed based on the comparative voltage VR decide the output current level.
I0
I1
Current level
H
H
0
L
H
Low
H
L
Typ
L
L
High
(3) VR (Comparative voltage)
The current level can be continuously changed by changing the voltage at VR continuously.
(4) Current sensor
When the voltage fall at the current sensing resistor and the selected current level become of the same level, the
output state is cut off for a certain time by inverting the comparator.
During this cutoff time, the current volume decreases slightly due to the L component of the motor and falls short of
the comparative level. During the time fixed based on the PWM frequency, the output stage goes in ON state and
then in OFF state and this ON/OFF operation is repeated.
(5) PWM oscillator
A capacitor Cf is externally connected to CT pin in order to fix the PWM oscillator frequency. The frequency fc is
calculated as follows.
1
fc =
7.77 x 103 x Cf
(6) Analog control
The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the
comparator.
(7) Thermal shutdown function
This IC has a function to protect itself against thermal damage which is caused when the chip temperature rises
abnormally.
Regarding this function, refer to “PRECAUTIONS FOR USE.”
Rev.1.0, Sep.19.2003, page 5 of 10
 

Share Link: 

datasheetbank.com [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]