L6235D STMicroelectronics, L6235D Datasheet - Page 14

• Manufacturer Part Number: L6235D
• Description: IC DRIVER 3PH DC MOTOR 24SOIC
• Manufacturer: STMicroelectronics
• Type: Driverr

Specifications of L6235D

• Applications: DC Motor Driver, Brushless (BLDC), 3 Phase
• Number Of Outputs: 1
• Current - Output: 5.6A
• Voltage - Supply: 12 V ~ 52 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Supply Voltage: 7 V to 52 V
• Supply Current: 0.006 A
• Mounting Style: SMD/SMT
• Motor Type: Three Phase DC Brushless
• No. Of Outputs: 3
• Output Current: 7.1A
• Output Voltage: 52V
• Supply Voltage Range: 8V To 52V
• Driver Case Style: SO
• No. Of Pins: 24
• Operating Temperature Range: -40°C
• Rohs Compliant: Yes
• For Use With: 497-4935 - BOARD MOTOR BRUSHLESS DC L6235
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-4009-5; 497-4216-5; 497-4216-5

L6235
TACHO
A tachometer function consists of a monostable, with constant off time (t
signal (H
14. For component values refer to Application Information section.
The monostable output drives an open drain output pin (TACHO). At each rising edge of the Hall Effect Sensors
H
t
to the pin RCPULSE. Figure 16 gives the relation between t
where C
By connecting the tachometer pin to an external pull-up resistor, the output signal average value V
tional to the frequency of the Hall Effect signal and, therefore, to the motor speed. This realizes a simple Fre-
quency-to-Voltage Converter. An op amp, configured as an integrator, filters the signal and compares it with a
reference voltage V
Figure 14. Tacho Operation Waveforms.
14/25
PULSE
1
, the monostable is triggered and the MOSFET connected to pin TACHO is turned off for a constant time
t
PULSE
V
(see Figure 15). The off time t
M
PUL
1
). It allows developing an easy speed control loop by using an external op amp, as shown in Figure
=
should be chosen in the range 1nF … 100nF and R
= 0.6 · R
t
----------------- - V
P ULS E
T
REF
PUL
, which sets the speed of the motor.
DD
· C
V
PUL
TACHO
H
H
H
V
M
1
2
3
PULSE
can be set using the external RC network (R
t
PULSE
V
T
DD
PULSE
PUL
and C
in the range 20K
PULSE
PUL
, R
), whose input is one Hall Effect
PUL
. We have approximately:
… 100K .
PUL
, C
PUL
) connected
M
is propor-