ZAMC4100 Datasheet, PDF (59/155 Pages) Integrated Device Technology – Actuator and Motor Controller

ZAMC4100 Datasheet
3.8. Half-Bridge Drivers
Within the SBC chip, there are 4 half-bridge (HB) drivers for HB1 to HB4. Figure 3.12 shows the block diagram,
which is the same for each HB driver.
Figure 3.12 Structure of the Half-Bridge Drivers
HBxHEN
OVT Reset
OVTIF
CPVEIF
OVIF
UVIF
HBxOSF
Charge
Pump
Limit
Driver H
VSS
HBx
PWMEN
From PWM Block
OVT Reset
HBxLEN
HBxOCIF
20µs Counter
Integrator
5V
Driver L
Limit
OCH
Detect
VDDE
HBxCSHEN
Open/Short
Detect
HBxCSLEN
OCL
Detect
CSH
HBx pin
CSL
VSS
VSS
Features of the HB Drivers:
• Separate enable bit for each MOSFET. If both enable bits are set, then both MOSFETs are off; this safety
logic avoids the possibility of turning on both NMOS.
• Separate PWM enable bit for each driver.
• Each MOSFET has over-current detection (OCH and OCL for the high and low side drivers respectively)
and protection circuitry. The over-current event automatically disables the driver (see section 3.8.2).
• If an over-voltage or under-voltage is detected at the VDDE pin the drivers are automatically disabled
(see section 3.4).
• Each driver has diagnostic circuitry for detection of open or short conditions in the output load (see
section 3.8.3).
© 2016 Integrated Device Technology, Inc.
59
January 26, 2016