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PDF MAX14871 Data sheet ( Hoja de datos )
| Número de pieza | MAX14871 | |
| Descripción | 4.5V to 36V Full-Bridge DC Motor Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX14871 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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MAX14871
EVALUATION KIT AVAILABLE
4.5V to 36V Full-Bridge DC Motor Driver
General Description
The MAX14871 DC motor driver provides a low-power
and simple solution for driving and controlling brushed
motors with voltages between 4.5V and 36V. Very low
driver on resistance reduces power during dissipation.
The MAX14871 features a charge-pump-less design for
reduced external components and low supply current.
Integrated current regulation allows user-defined peak startup
motor currents and requires minimal external components.
The MAX14871 includes 3 modes of current regulation:
fast decay, slow decay, and 25% current ripple modes.
Current regulation based on 25% ripple simplifies the
design and enables regulation independent of motor
characteristics. A separate voltage sense input (SNS) reduc-
es current-sensing errors due to parasitic trace resistance.
The MAX14871 features shoot-through protection and
internal free-wheeling diodes that absorb inductive motor
currents. Driver outputs are short-circuit-protected from
shorts to ground, to the supply, and between M1 and M2.
An active-low FAULT output signals thermal overload and
overcurrents during fault conditions.
The MAX14871 is available in a 16-pin TSSOP-EP package
and operates over the -40°C to +85°C temperature range.
Applications
●● Printers and Scanners
●● Industrial Automation
●● Vending and Gaming Machines
Typical Application Circuit
Benefits and Features
●● Drive More Power and Reduce Footprint
• Up to 2.8A Peak Motor-Current Package
• Flexible 4.5V–36V Supply Enables Longer Runtime
●● Low Power Consumption Runs Cooler and Longer
• 334mΩ (typ) Total Bridge On-Resistance
• 1mA (typ) Supply Current at 30kHz/24V
• 10µA (max) Standby Current at 12V
●● Simplified Designs Reduces Time to Market
• Charge-Pump-Less Architecture
• Current Regulation Only Requires a Sense Resistor
• Current-Sense Input Simplifies PCB Layout
• Internal/External VREF for Current Regulation
• Fast/Slow/25% Ripple Current Regulation Modes
●● Integrated Protection Provides Robust Driving Solutions
• Short-Circuit-Protected Drivers
• Thermal Shutdown Undervoltage Lockout
• Diagnostic FAULT Output
• -40°C to +85°C Temperature Range
Ordering Information appears at end of data sheet.
24V
M
3.3V 3.3V
VDD M1
IRQ
µC GPO
PWM
FAULT
DIR
PWM
EN
3.3V
VREF
TCOFF
COFF
MODE
DRIVER
VDD
CURRENT
REGULATION
SNS
M2
MAX14871
VDD
DRIVER
COM
RSENSE
GND
19-7063; Rev 0; 9/14
1 page  
MAX14871
Test Circuits/Timing Diagrams
4.5V to 36V Full-Bridge DC Motor Driver
M1/ M2
RL
CL
PWM/DIR
M1/M2
1V
tPR
Figure 1. M1/M2 Propagation Delays
VL
0V
VDD
1V
0V
tPF
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX14871
4.5V to 36V Full-Bridge DC Motor Driver
Slope Control
The MAX14871 drivers turn-on and turn-off with active
slope control during the M1/M2 transition times. This
integrated slew rate limiting reduces EMC, like conducted
and radiated EMI, associated with high di/dt and dv/dt
rates.
Thermal Shutdown
The MAX14871 includes integrated protection against
thermal overload. When the junction temperature exceeds
160°C (typ), the H-bridge is tri-stated and FAULT asserted.
M1 and M2 are automatically re-enabled when the
junction temperature falls to 150°C (typ).
Current Sensing
Connect a sense resistor (RSENSE) between COM and
GND to monitor the motor current during operation. Select
RSENSE such that the voltage at COM created by motor
current flowing through the sense resistor is limited to with-
in 250mV relative to GND (-250mV ≤ VCOM ≤ +250mV).
Table 1. Current Regulation Modes
INPUTS
MODE
0.75V
0.75V
GND
> 1.5V
GND
> 1.5V
VREF
GND
> 0.4V
GND
GND
> 0.4V
> 0.4V
Regulation Mode
25% Ripple
25% Ripple
TCOFF
TCOFF
TCOFF
TCOFF
Minimize series trace resistance from RSENSE to GND to
minimize voltage sense errors due to parasitic trace inter-
connect resistance. Use a star ground connection between
the MAX14871 GND pins and the GND-side of RSENSE.
Connect the SNS trace close to the RSENSE resistor in
order to minimize current-sensing error introduced by IR
voltage created by the trace resistance of the high-current
COM to RSENSE trace. If external current monitoring/
regulation is used, as shown in Figure 5, connect the
voltage sense inputs close to the RSENSE resistor. Optionally
use differential voltage sensing for higher accuracy
sensing. Connect the voltage sense close to the RSENSE
resistor and/or use differential voltage-sensing. See Figure 4.
Current Regulation
The MAX14871 features internal current-regulation to limit
the stall current. Current regulation is based on the maxi-
mum motor current (set with the RSENSE resistor) and
the voltage at VREF. When the motor current exceeds the
value, the motor current is automatically reduced, either
by driving both H-bridge outputs low (braking/slow decay),
CURRENT REGULATION MODE
Decay Type
VREF
FAST
Internal (=1V)
FAST
External
FAST
Internal (=1V)
SLOW
Internal (=1V)
FAST
External
SLOW
External
TCOFF
-
-
15µs
15µs
Toff
Toff
M1
COM
GND
GNEP D
GND
GND
GND
COM
M2
GND
Figure 4. Star connection between COM, SNS, and GND
To SNS
RSENSE
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX14871.PDF ] | |
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