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STMicroelectronics Electronic Components Datasheet

L6235Q Datasheet

DMOS driver

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L6235Q pdf
L6235Q
DMOS driver for 3-phase brushless dc motor
Features
Operating supply voltage from 8 to 52 V
5.6 A output peak current
RDS(on) 0.3 Ω typ. value @ TJ = 25 °C
Operating frequency up to 100 kHz
Non-dissipative overcurrent protection
Diagnostic output
Constant tOFF PWM current controller
Slow decay synchronous rectification
60° and 120° Hall effect decoding logic
Brake function
Tacho output for speed loop
Cross conduction protection
Thermal shutdown
Undervoltage lockout
Integrated fast freewheeling diodes
Figure 1. Block diagram
QFN-48
(7 x 7 mm)
Description
The L6235Q is a DMOS fully integrated 3-phase
motor driver with overcurrent protection. Realized
in BCDmultipower technology, the device
combines isolated DMOS power transistors with
CMOS and bipolar circuits on the same chip. The
device includes all the circuitry needed to drive a
3-phase BLDC motor including: a 3-phase DMOS
bridge, a constant OFF time PWM current
controller and the decoding logic for single ended
Hall sensors that generates the required
sequence for the power stage. Available in
QFN48 7x7 package, the L6235Q features a non-
dissipative overcurrent protection on the high-side
power MOSFETs and thermal shutdown.
VBOOT
VCP
DIAG
EN
BRAKE
FWD/REV
H3
H2
H1
RCPULSE
TACHO
VBOOT
CHARGE
PUMP
THERMAL
PROTECTION
OCD
OCD1
OCD2
OCD3
OCD
VBOOT
OCD1
10V
VBOOT
HALL-EFFECT
SENSORS
DECODING
LOGIC
GATE
LOGIC
OCD2
10V
VBOOT
TACHO
MONOSTABLE
10V 5V
VOLTAGE
REGULATOR
OCD3
10V
ONE SHOT
MONOSTABLE
PWM
MASKING
TIME
+
SENSE
-
COMPARATOR
VSA
OUT1
OUT2
SENSEA
VSB
OUT3
SENSEB
VREF
RCOFF
AM02555v1
November 2011
Doc ID 018997 Rev 2
1/33
www.st.com
33


STMicroelectronics Electronic Components Datasheet

L6235Q Datasheet

DMOS driver

No Preview Available !

L6235Q pdf
Contents
Contents
L6235Q
1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Power stages and charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Logic inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 PWM current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Slow decay mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 Decoding logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Tacho . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7 Non-dissipative overcurrent detection and protection . . . . . . . . . . . . . . . 18
4.8 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Output current capability and IC power dissipation . . . . . . . . . . . . . . 25
7 Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2/33 Doc ID 018997 Rev 2


Part Number L6235Q
Description DMOS driver
Maker STMicroelectronics
Total Page 30 Pages
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