L6235N STMicroelectronics, L6235N Datasheet - Page 8

• Manufacturer Part Number: L6235N
• Description: IC DRIVER 3PHASE MOTOR 24-PWRDIP
• Manufacturer: STMicroelectronics
• Type: Driverr

Specifications of L6235N

• 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: Through Hole
• Package / Case: 24-DIP (0.300", 7.62mm)
• Operating Supply Voltage: 7 V to 52 V
• Supply Current: 0.006 A
• Mounting Style: Through Hole
• 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: DIP
• No. Of Pins: 24
• 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: 497-5353-5; L6235N

L6235
CIRCUIT DESCRIPTION
POWER STAGES and CHARGE PUMP
The L6235 integrates a Three-Phase Bridge, which
consists of 6 Power MOSFETs connected as shown
on the Block Diagram. Each Power MOS has an
R
fast freewheeling diode. Switching patterns are gen-
erated by the PWM Current Controller and the Hall
Effect Sensor Decoding Logic (see relative para-
graphs). Cross conduction protection is implemented
by using a dead time (t
internal timing circuit between the turn off and turn on
of two Power MOSFETs in one leg of a bridge.
Pins VS
the supply voltage (V
Using N-Channel Power MOS for the upper transis-
tors in the bridge requires a gate drive voltage above
the power supply voltage. The Bootstrapped Supply
(V
few external components to realize a charge pump
circuit as shown in Figure 3. The oscillator output (pin
VCP) is a square wave at 600KHz (typically) with 10V
amplitude. Recommended values/part numbers for
the charge pump circuit are shown in Table1.
Table 1. Charge Pump External Component
Values.
Figure 3. Charge Pump Circuit
8/25
DS(ON)
C
C
R
D
D
BOOT
BOOT
P
P
1
2
VCP
) is obtained through an internal oscillator and
A
= 0.3
and VS
D1
R
C
P
P
D2
VBOOT
(typical value @25°C) with intrinsic
B
MUST be connected together to
S
C
).
BOOT
DT
= 1µs typical value) set by
220nF
10nF
100
1N4148
1N4148
VS
A
VS
B
D01IN1328
V
S
LOGIC INPUTS
Pins FWD/REV, BRAKE, EN, H
CMOS and µC compatible logic inputs. The internal
structure is shown in Figure 4. Typical value for turn-
ON and turn-OFF thresholds are respectively V
= 1.8V and V
Pin EN (enable) may be used to implement Overcurrent
and Thermal protection by connecting it to the open col-
lector DIAG output If the protection and an external dis-
able function are both desired, the appropriate
connection must be implemented. When the external
signal is from an open collector output, the circuit in Fig-
ure 5 can be used . For external circuits that are push
pull outputs the circuit in Figure 6 could be used. The re-
sistor R
180K . Recommended values for R
spectively 100K
lecting the values can be found in the Overcurrent
Protection section.
Figure 4. Logic Input Internal Structure
Figure 5. Pin EN Open Collector Driving
Figure 6. Pin EN Push-Pull Driving
COLLECTOR
PUSH-PULL
OUTPUT
OUTPUT
OPEN
EN
should be chosen in the range from 2.2K to
R
th(OFF)
EN
5V
C
R
EN
PROTECTION
EN
C
and 5.6nF. More information for se-
EN
= 1.3V.
ESD
DIAG
DIAG
EN
EN
PROTECTION
5V
PROTECTION
1
D01IN1329
, H
ESD
ESD
EN
2
and H
and C
5V
5V
3
EN
are TTL/
D02IN1378
D02IN1379
are re-
th(ON)