MPC17510 データシートの表示（PDF） - Freescale Semiconductor
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MPC17510 Datasheet PDF : 14 Pages
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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 17510 is a monolithic H-Bridge power IC applicable to
small DC motors used in portable electronics. The 17510 can
operate efficiently with supply voltages as low as 2.0 V to as
high as 15 V, and it can provide continuos motor drive
currents of 1.2 A while handling peak currents up to 3.8 A. It
is easily interfaced to low-cost MCUs via parallel 5.0 V-
compatible logic. The device can be pulse width modulated
(PWM-ed) at up to 200 kHz. The 17510 has four operating
modes: Forward, Reverse, Brake, and Tri-Stated (High
Impedance).
Basic protection and operational features (direction,
dynamic braking, PWM control of speed and torque, main
power supply undervoltage detection and shutdown, logic
power supply undervoltage detection and shutdown), in
addition to the 1.0 A rms output current capability, make the
17510 a very attractive, cost-effective solution for controlling
a broad range of small DC motors. In addition, a pair of 17510
devices can be used to control bipolar stepper motors. The
17510 can also be used to excite transformer primary
windings with a switched square wave to produce secondary
winding AC currents.
As shown in Figure 2, 17510 Simplified Internal Block
Diagram, page 2, the 17510 is a monolithic H-Bridge with
built-in charge pump circuitry. For a DC motor to run, the
input conditions need to be set as follows: ENable input logic
HIGH, one INput logic LOW, and the other INput logic HIGH
(to define output polarity). The 17510 can execute dynamic
braking by setting both IN1 and IN2 logic HIGH, causing both
low-side MOSFETs in the output H-Bridge to turn ON.
Dynamic braking can also implemented by taking the ENable
logic LOW. The output of the H-Bridge can be set to an open-
circuit high-impedance (Z) condition by taking both IN1 and
IN2 logic LOW. (refer to Table 5, Truth Table, page 7).
The 17510 outputs are capable of providing a continuous
DC load current of up to 1.2 A. An internal charge pump
supports PWM frequencies to 200 kHz. The EN pin also
controls the charge pump, turning it off when EN = LOW, thus
allowing the 17510 to be placed in a power-conserving sleep
mode.
FUNCTIONAL PIN DESCRIPTION
OUTPUT 1 AND OUTPUT2 (OUT1, OUT2)
The OUT1 and OUT2 pins provide the connection to the
internal power MOSFET H-Bridge of the IC. A typical load
connected between these pins would be a small DC motor.
These outputs will connect to either VM or PGND, depending
on the states of the control inputs (refer to Table 5, Truth
Table, page 7).
POWER GROUND AND LOGIC GROUND (PGND,
LGND)
The power and logic ground pins (PGND and LGND)
should be connected together with a very low-impedance
connection.
CHARGE PUMP RESERVOIR CAPACITOR (CRES)
The CRES pin provides the connection for the external
reservoir capacitor (output of the charge pump). Alternatively
this pin can also be used as an input to supply gate-drive
voltage from an external source via a series current-limiting
resistor. The voltage at the CRES pin will be approximately
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the IC to supply gate drive for the internal power MOSFET
H-Bridge.
MOTOR SUPPLY VOLTAGE INPUT (VM)
The VM pins carry the main supply voltage and current into
the power sections of the IC. This supply then becomes
controlled and/or modulated by the IC as it delivers the power
to the load attached between OUT1 and OUT2. All VM pins
must be connected together on the printed circuit board with
as short as possible traces offering as low impedance as
possible between pins.
VM has an undervoltage threshold. If the supply voltage
drops below the undervoltage threshold, the output power
stage switches to a tri-state condition. When the supply
voltage returns to a level that is above the threshold, the
power stage automatically resumes normal operation
according to the established condition of the input pins.
CONTROL SIGNAL INPUT AND ENABLE CONTROL
SIGNAL INPUT (IN1, IN2, EN)
The IN1, IN2, and EN pins are input control pins used to
control the outputs. These pins are 5.0 V CMOS-compatible
inputs with hysteresis. The IN1, IN2, and EN work together to
control OUT1 and OUT2 (refer to Table 5, Truth Table).
GATE DRIVER INPUT (GIN)
The GIN input controls the GOUT pin. When GIN is set
logic LOW, GOUT supplies a level-shifted high-side gate
drive signal to an external MOSFET. When GIN is set logic
HIGH, GOUT is set to GND potential.
17510
8
Analog Integrated Circuit Device Data
Freescale Semiconductor
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