PAC5220 Datasheet, PDF (38/73 Pages) Active-Semi, Inc – Power Application Controller

PAC5220
Power Application Controller
12.3. Functional Description
The Application Specific Power Drivers (ASPD, Figure 12-1) module handles power driving for power control
applications. The PAC5220 has three low-side gate drivers (DRLx), three high-side gate drivers (DRHx), and
two high-voltage open-drain drivers (OHIx). Each gate driver can drive an external MOSFET or IGBT switch in
response to high-speed control signals from the microcontroller ports, and a pair of high-side and low-side gate
drivers can form a half-bridge driver. The open-drain drivers provide activation control for relays, LEDs, buffers,
and other loads.
Figure 12-2 below shows typical gate driver connections and Table 12-1 shows the ASPD resources available
on different PAC part numbers. The PAC5220 gate drivers support up to a 52V supply.
Figure 12-2. Typical Gate Driver Connections
PAC5220
DRBx
DRHx
DRSx
DRLx
V
P
V
IN
(To loads/inductors.)
Table 12-1. Power Driver Resources by Part Numbers
LOW-SIDE GATE
DRIVER
PART
NUMBER
SOURCE /
DRLx SINK
CURRENT
HIGH-SIDE GATE DRIVER
DRHx
MAX
SUPPLY
SOURCE/
SINK
CURRENT
PAC5220 3
1A/1A
3
52V
1A/1A
OPEN-DRAIN DRIVER
OHIx
2 (40V/ 40mA)
The ASPD includes built-in configurable fault protection for the internal gate drivers.
12.3.1. Low-Side Gate Driver
The DRLx low-side gate driver drives the gate of an external MOSFET or IGBT switch between the low-level
VSSP power ground rail and high-level VP supply rail. The DRLx output pin has sink and source output current
capability of 1A. Each low-side gate driver is controlled by a microcontroller port signal with 4 configurable levels
of propagation delay.
12.3.2. High-Side Gate Driver
The DRHx high-side gate driver drives the gate of an external MOSFET or IGBT switch between its low-level
DRSx driver source rail and its high-level DRBx bootstrap rail. The DRSx pin can go up to 52V steady state. The
DRHx output pin has sink and source output current capability of 1A. The DRBx bootstrap pin can have a
maximum operating voltage of 16V relative to the DRSx pin, and up to 64V steady state. The DRSx pin is
designed to tolerate momentary switching negative spikes down to -5V without affecting the DRHx output state.
Each high-side gate driver is controlled by a microcontroller port signal with 4 configurable levels of propagation
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Rev 1.0‒February 25, 2014