L6235
DMOS driver for 3-phase brushless DC motor
Datasheet
-
production data
Features
Operating supply voltage from 8 to 52 V
5.6 A output peak current (2.8 A DC)
R
DS(ON)
0.3
typ. value at T
j
= 25 °C
Operating frequency up to 100 KHz
Non-dissipative overcurrent detection and
protection
Diagnostic output
Constant t
OFF
PWM current controller
Slow decay synchr. rectification
60° and 120° hall effect decoding logic
Brake function
Tachometer output for speed loop
Cross conduction protection
Thermal shutdown
Undervoltage lockout
Integrated fast freewheeling diodes
Description
The L6235 device is a DMOS fully integrated
3-phase motor driver with overcurrent protection.
Realized in BCD 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 PowerDIP24 (20 + 2 + 2),
PowerSO36 and SO24 (20 + 2 + 2) packages, the
L6235 device features a non-dissipative
overcurrent protection on the high-side power
MOSFETs and thermal shutdown.
October 2014
This is information on a product in full production.
DocID7618 Rev 3
1/35
www.st.com
Contents
L6235
Contents
1
2
3
4
5
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1
5.2
Power stages and charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Logic inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6
7
8
9
10
11
PWM current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Slow decay mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Decoding logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Non-dissipative overcurrent detection and protection . . . . . . . . . . . . 22
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
11.1
11.2
Output current capability and IC power dissipation . . . . . . . . . . . . . . . . . 26
Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
12
13
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
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DocID7618 Rev 3
L6235
Block diagram
1
Block diagram
Figure 1. Block diagram
DocID7618 Rev 3
3/35
35
Maximum ratings
L6235
2
Maximum ratings
Table 1. Absolute maximum ratings
Symbol
V
S
V
OD
V
BOOT
V
IN
, V
EN
V
REF
V
RCOFF
V
SENSE
I
S(peak)
I
S
T
stg
, T
OP
Supply voltage
Parameter
Test conditions
V
SA
= V
SB
= V
S
V
SA
= V
SB
= V
S
= 60 V;
V
SENSEA
= V
SENSEB
= GND
V
SA
= V
SB
= V
S
Value
60
60
V
S
+ 10
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-1 to 4
Unit
V
V
V
V
V
V
V
V
A
A
°C
Differential voltage between:
VS
A
, OUT
1
, OUT
2
, SENSE
A
and VS
B
, OUT
3
,
SENSE
B
Bootstrap peak voltage
Logic inputs voltage range
Voltage range at pin VREF
Voltage range at pin RCOFF
V
RCPULSE
Voltage range at pin RCPULSE
Voltage range at pins SENSE
A
and SENSE
B
Pulsed supply current (for each VS
A
and VS
B
pin)
DC supply current (for each VS
A
and VS
B
pin)
Storage and operating temperature range
V
SA
= V
SB
= V
S
; T
PULSE
< 1 ms
V
SA
= V
SB
= V
S
7.1
2.8
-40 to 150
Table 2. Recommended operating condition
Symbol
V
S
V
OD
V
REF
V
SENSE
I
OUT
T
J
f
SW
Supply voltage
Differential voltage between:
VS
A
, OUT
1
, OUT
2
, SENSE
A
and VS
B
, OUT
3
,
SENSE
B
Voltage range at pin VREF
Voltage range at pins SENSE
A
and SENSE
B
DC output current
Operating junction temperature
Switching frequency
(pulsed t
W
< t
rr
)
(DC)
V
SA
= V
SB
= V
S
-25
Parameter
Test conditions
V
SA
= V
SB
= V
S
V
SA
= V
SB
= V
S
;
V
SENSEA
= V
SENSEB
-0.1
-6
-1
Min. Max. Unit
12
52
52
5
6
1
2.8
125
100
V
V
V
V
V
A
°C
KHz
4/35
DocID7618 Rev 3
L6235
Table 3. Thermal data
Symbol
R
th(j-pins)
R
th(j-case)
R
th(j-amb)1
R
th(j-amb)1
R
th(j-amb)1
R
th(j-amb)2
Description
Maximum thermal resistance junction pins
Maximum thermal resistance junction case
Maximum thermal resistance junction ambient
(1)
Maximum thermal resistance junction ambient
(2)
Maximum thermal resistance junction ambient
(3)
Maximum thermal resistance junction ambient
(4)
43
-
-
58
51
-
-
77
PDIP24
18
SO24
14
Maximum ratings
PowerSO36
Unit
C/W
1
-
35
15
62
C/W
C/W
C/W
C/W
C/W
1. Mounted on a multilayer FR4 PCB with a dissipating copper surface on the bottom side of 6 cm
2
(with a thickness of
35 µm).
2. Mounted on a multilayer FR4 PCB with a dissipating copper surface on the top side of 6 cm
2
(with a thickness of 35 µm).
3. Mounted on a multilayer FR4 PCB with a dissipating copper surface on the top side of 6 cm
2
(with a thickness of 35 µm),
16 via holes and a ground layer.
4. Mounted on a multilayer FR4 PCB without any heatsinking surface on the board.
DocID7618 Rev 3
5/35
35
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