AT5801
Preliminary Product Information
4-Channel Motor driver for Portable CD Player
9. Driver gain
Driver input resistance is 10KΩ for CH1, CH3, CH4 and input resistance of CH2 is 7.5KΩ. Driver
gain can be set by using an external resistor and applying the following equations.
10. Short-circuit protection function
When the output of error amplifier is “H”, if the voltage of SPRT terminal has reached 1.265V upon
charging the terminal, switching of SW terminal will be disabled. Switching off time depends on the
value of the capacitor at SCP:
VTH
ISPRT
t = CSPRT ×
(sec)
(VTH = 1.265V , ISPRT = 5µA)
11. Soft-start function and maximum duty
Maximum duty can be changed by attaching a resistor to pin 4.
t = CDEAD × R(sec)
(R = 65KΩ)
12. Power-off operation
SPRT terminal is charged by setting OFF terminal to “L”.Typically, the switching of SW terminal
will be terminated when the voltage at the SPRT terminal reaches 1.265V.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
2006/2/8 REV:1.1
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
