MC33486ADH Freescale Semiconductor, MC33486ADH Datasheet - Page 10

• Manufacturer Part Number: MC33486ADH
• Description: IC SWITCH DUAL H-SIDE 20-HSOP
• Manufacturer: Freescale Semiconductor

Specifications of MC33486ADH

• 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: Lead free / RoHS Compliant
• Voltage - Load: -

vary typically from 1.0 MHz to 7.0 MHz. It starts operating at
low frequency.
Reverse Battery Protection
of the power MOSFETs, which are forward biased.
shows the specific protection that must be implemented.
or in the VBAT terminal of the application (i.e., diode or
MOSFET) in order to achieve both reverse battery and
negative transient pulses immunity. If a polarized capacitor is
used, it can be placed as shown in in
Loss of Ground Protection
33486A because the ground terminal of the device is the
same as the ground of the low side.
Overvoltage/Undervoltage Protection
are turned low (low-side MOSFETs ON) in a low-speed
mode. The 33486A goes back into normal operation mode as
soon as V
undervoltage protection circuitry has hysteresis.
turns the external low-side MOSFETs ON and protects the
load in case V
also be clamped to 14 V to protect the external low-side
MOSFETs. The low-side MOSFETs remain in the ON state
until the overvoltage condition is removed.
status output.
10
33486A
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
During reverse battery the current flows in the body diodes
A reverse battery component might be needed in the GND
As
If the battery voltage falls below 7.0 V typical, the outputs
The control circuitry also has an overvoltage detection that
Undervoltage and overvoltage are not reported on the
Figure 5. Reverse Battery Protection Schematic
Figure 5
BAT
C
BAT
rises above the undervoltage threshold. The
shows, a loss of ground will not damage the
exceeds 29 V typical. The gate drivers will
MC33486
VBAT
GND
Vbat
gnd
33486
Reverse Battery Protection
External Low-Side
Power MOSFETs
Figure
VBAT
5.
Figure 5
Self-Adjusting Switching Speed Mode
dissipation depending on the application. The 33486A 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 250 µ s
typical. The low-speed mode is active when the delay
between two consecutive input edges is above 250 µ s
typical. The 250 µ s delay corresponds about to a 2.0 kHz
frequency with a duty cycle of 50%.
Current Recopy
3700 of the sum of the high-side output current. An external
resistor must be connected to the Cur R terminal, then tied to
a microcontroller A / D input for analog voltage measurement
(see
Wheatstone bridge principle with the Sense, the Power, and
the load as the three known resistances.
transistor, the Cur R max voltage is typically 11 V.
33486A, the amplifier A
output to keep the same I
keep between ±1.0 V.
Overtemperature Protection
Overtemperature detection occurs when an internal high-side
MOSFET is in the ON state. When an overtemperature
condition occurs, both outputs are affected. Both high-side
MOSFETs are turned OFF to protect the 33486A from
This feature allows for reduction in EMC and power
This feature provides a current mirror with the ratio of 1/
Owing to the internal zener clamp in the gate of the M1
.
In case a ground shift occurs between the MCU and the
The 33486A incorporates overtemperature protection.
Figure
To A/D
External
Resistor
External
resistor
Figure 6. Current Recopy Principle
6). This current recopy uses the well-known
M1
I
I copy
COPY
Cur R
Cur R
R
Logic Ground
Logic
gnd
Sense
Analog Integrated Circuit Device Data
(Figure
COPY
A
+
-
1
MC33486
gnd
33486A Ground
. Of course the shift has to
Power
6, page 10) will adapt its
Freescale Semiconductor
5000
I load
LOAD
M