L6229 STMicroelectronics, L6229 Datasheet - Page 10

• Manufacturer Part Number: L6229
• Description: DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR
• Manufacturer: STMicroelectronics

L6229
verse recovery of the freewheeling diodes. The L6229 provides a 1µs Blanking Time t
comparator output so that the current spike cannot prematurely retrigger the monostable.
Figure 10. PWM Current Controller Simplified Schematic
Figure 11. Output Current Regulation Waveforms
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C
OFF
5V
R
V
5mA
V
SENSE
SENSE
I
OUT
V
REF
2.5V
OFF
V
ON
5V
REF
(0)
0
RC
RCOFF
R
TO GATE
OFF
SYNCHRONOUS RECTIFICATION
(1)
LOGIC
D02IN1351
2.5V
Q
+
-
R
S
MONOSTABLE
BLANKING TIME
MONOSTABLE
SET
1µs
COMPARATOR
SENSE
B
BLANKER
Slow Decay
t
RCFALL
DEAD TIME
1µs t
t
DRIVERS
1µs t
t
GATE DRIVERS
RCRISE
OFF
C
+
-
FROM THE
LOW-SIDE
+
BLANK
DT
R SENSE
VREF
VS
D
B
SENSE B
t
ON
A
DEAD TIME
DRIVERS
+
B
Slow Decay
t
RCFALL
1µs t
t
1µs t
t
RCRISE
SENSE A
OFF
C
BLANK
DT
DEAD TIME
DRIVERS
+
BLANK
D02IN1380
D
VS
A
that inhibits the
VS
OUT 2
OUT 3
OUT 1