FAN8038 Fairchild Semiconductor, FAN8038 Datasheet - Page 10

• Manufacturer Part Number: FAN8038
• Description: 4-Channel Motor Drive IC
• Manufacturer: Fairchild Semiconductor

FAN8038B(KA3038)
Application Information
1. Mute Function
• When The BRAKE Pin is low is normal opration (high is CH1 mute on).
• When The Mute2 Pin is low is normal opration (high is CH2 mute on).
• When The Mute34 Pin is high is normal opration (low is CH3,4 mute on).
2. Vref Drop Mute (Figure 1)
• When the Voltage of the mute pin is above 1V, the mute circuit is stopped and the output circuit is.
3. Thermal Shutdown(Figure 2)
• If the chip temperature rises above 150 C, then the thermal shutdown (TSD) circuit is activated and the output circuit will
4. H-bridge Driver (4-Channels)
Driver input resistance is 10k of CH1, CH3, CH4 and input resistance of CH2 is 7.5k .
Driver gain can obtain under -mentioned
R is External resistance.
10
be mute.
CH1, 3, 4:
CH2
VREF
Figure 1. VREF Drop MUTE Circuit
GV
GV = 20log
=
20
VCC
log
---------------------- -
7.5K
-------------------- -
11K
110K
55K
+
+
R
R
CH Bias Block
Hysteresis
Figure 2. TSD Circuit
VCC
Q1
1
2
ircuit
ircuit
ircuit
CH Bias Block