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z
z
Normally VB should provide enough current for output loading, thus large value of
capacitor such as is suggested for the terminal VB. Besides, 0.01uF~0.1uF of
capacitors are also suggested between each output channel and output channel
to ground.
The settling time from standby mode to output ready is about 10us. The main
difference between STANDBY1 and STANDBY2 depends on voltage reference in
the internal circuit is ready or not. In general, the rising time of constant current
from the mode, STANDBY2, to the mode, O1 & O2 (or O2 & O3) should be faster
than that of the mode, STANDBY1. However, the supply current ISTB2 is larger
than that of ISTB1 , there is the tradeoff between the rising time and the amount of
supply current.
z
Constant current operation of 11-MD114 provides the current, which can be
0.2
evaluated by the formula I =
A . It is obviously that constant current
( )
RFG
Ω
( )
depends on the loading resistance of the terminal, RFG. Therefore, how to reduce
the effect of line resistance from the terminal, RFG, to GND, will decide the
accuracy of constant current.
z
The power dissipated by the IC varies widely with the supply voltage, the output
current, and loading. It is important to ensure the application does not exceed the
allowable power dissipation of the IC package. The recommended motor driver
power dissipation versus temperature is depicted as follows:
Pdmax VS Ta
1000
JESD51-7
900
870mW
800
700
600
JESD51-3
486mW
500
400
300
200
100
25
0
50
75
100
125
Ambient Temperature ( ℃ )
SP-MD114-A.006.doc
Version：A.006
Page：8
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