MC33486DH Freescale Semiconductor, MC33486DH Datasheet - Page 6

• Manufacturer Part Number: MC33486DH
• Description: IC SWITCH DUAL H-SIDE 20-HSOP
• Manufacturer: Freescale Semiconductor

Specifications of MC33486DH

• Applications: DC Motor Controller, H Bridge
• Number Of Outputs: 1
• Current - Output: 10A
• Voltage - Supply: 8 V ~ 28 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-HSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Not Compliant

Introduction
applications. The bridge is partitioned into three blocks, the
DHSB and two low side MOSFETS, each block has a
dedicated package.
side power MOSFETS, high side current sensing , fault
protection and low side gate drivers.The inputs are CMOS
compatible,
microncontroller. The low side gate drivers control and protect
the two external low sides.
combined the outputs (OUT1 and OUT2) are fully protected
against shorts to GND, Shorts to Vbat, shorted loads, over/
under voltage and over temperature.
Power supply
line. The device has a standby mode (Wake at low logic level)
with a ultra low consumption (10uA max). In operation when
inputs are active, the supply current is up to 20mA.
DHSB it is recommended that sufficient capacitance (tens of
microfarads) be placed between Vbat and gnd of the IC. This
will help to insure the power supply stays within the specified
limits.
Reverse battery protection.
battery conditions because of the two body diodes of the
power MOSFETs, which are forward biased during a reverse
battery condition. A specific protection must be implemented.
pin of the application (i.e diode or Mosfet) in order to achieve
both reverse battery and negative transient pulses immunity.
in Figure 1. .
Loss of ground protection
impact on the DHSB, since the ground pin of the device is the
same as the ground of the low side.
Over/Under Voltage Protection
are turned low (Low Sides ON) in a low speed mode. The
These devices are intended for full H-bridge automotive
The DHSB incorporates two 15m ohm N-channel high
The device can be directly connected to the power supply
With the high current and fast switching ability of the
The device cannot sustain more than 1.5V of a reverse
A reverse battery component might be needed in the gnd
If a polarized capacitor is used, it can be placed as shown
As shown in the Figure 1. , a loss of ground has no bad
If the battery voltage falls to a level below 8.0V, the outputs
Figure 1. i Reverse Battery protection schematic
C
so
MC33486
they
Vbat
gnd
can
Dual High Side Switch for H-Bridge Automotive Applications
directly
When the three blocks are
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DEVICE DESCRIPTION
with
MC33486
a
DHSB goes back into normal operation mode as soon as the
Vbat rise above the undervoltage threshold. The undervoltage
protection circuitry has hysteresis.
which turns the Low sides ON and protects the load in case of
Vbat exceeding 28V.The gate drivers will also be clamped to
14V to protect the external low side FETs. The Low sides
remain in the ON state, until the over-voltage condition is
removed.
status output.
Self-adjusted switching speed mode
dissipation depending on the application.The DHSB has two
switching speeds (high and low) depending on the input pulse
width. The high speed condition is active when the delay
between two consecutive input edges is below 280us. The
low speed mode is active when the delay between two
consecutive input edges is above 280us. The 280us delay
corresponds about to a 2kHz frequency with a duty cycle of
50%.
Current Recopy
3700 of the high side output current. An external resistor must
be connected to the Cur R pin and then tied to a
microcontroller A/D input for analog voltage measurement.
The Cur R pin is internally clamped (Vclst) to protect the MCU
A/D input.
DHSB, the amplifier A (see Figure 2. ), will adapt its output to
keep the same I copy. Of course the shift has to keep between
+/- 1V.
Status
temperature and/or over current faults. See the Functional
Truth Table for all faults that are reported on this signal pin.
This pin is an open drain structure and needs an external pull
up resistor.
The control circuitry also has an overvoltage detection
Undervoltage and Overvoltage are not reported on the
This feature allows for reduction in EMC and power
This feature provides a current mirror with the ratio of 1/
In case a ground shift occurs between the MCU and the
The device has a single status pins which reports over
To A/D
External
resistor
Figure 2. Current Recopy Principle.
M1
I copy
Cur R
R
Logic
gnd
Sense
A
+
-
1
MC33486
gnd
Power
5000
I load
M
6