L6227PDTR STMicroelectronics, L6227PDTR Datasheet - Page 10

• Manufacturer Part Number: L6227PDTR
• Description: IC DRVR FULL BRDG DUAL 36PWRSOIC
• Manufacturer: STMicroelectronics
• Type: H Bridger

Specifications of L6227PDTR

• Input Type: Non-Inverting
• Number Of Outputs: 4
• On-state Resistance: 730 mOhm
• Current - Output / Channel: 1.4A
• Current - Peak Output: 2.8A
• Voltage - Supply: 8 V ~ 52 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 36-PowerSOIC
• Operating Supply Voltage: 8 V to 52 V
• Supply Current: 1.4 A
• Mounting Style: SMD/SMT
• For Use With: 497-6817 - EVAL BOARD FOR L6227Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4006-2

L6227
Figure 8. Output Current Regulation Waveforms
Figure 9 shows the magnitude of the Off Time t
culated from the equations:
where R
Therefore:
These values allow a sufficient range of t
The capacitor value chosen for C
Rise Time t
monostable is triggered. Therefore, the on time t
10/22
R
V
t
t
20K
0.47nF
t
t
t
V
SENSE
I
SENSE
RCFALL
OFF
DT
OFF(MIN)
OFF(MAX)
OUT
V
REF
2.5V
OFF
V
ON
OFF
5V
REF
0
RC
= 1µs (typical value)
= t
RCRISE
and C
RCFALL
= 0.6 · R
R
SYNCHRONOUS RECTIFICATION
= 6.6µs
C
D02IN1351
OFF
= 6ms
OFF
OFF
will only be an issue if the capacitor is not completely charged before the next time the
+ t
100K
OFF
are the external component values and t
100nF
DT
= 0.6 · R
· C
OFF
OFF
OFF
also affects the Rise Time t
· C
OFF
OFF
B
to implement the drive circuit for most motors.
+ t
OFF
Slow Decay
t
ON
RCFALL
DT
1 s t
t
1 s t
t
versus C
RCRISE
, which depends by motors and supply parameters, has to
OFF
C
BLANK
DT
OFF
D
DT
and R
RCRISE
t
is the internally generated Dead Time with:
ON
A
OFF
of the voltage at the pin RCOFF. The
B
values. It can be approximately cal-
Slow Decay
t
RCFALL
1 s t
t
1 s t
t
RCRISE
OFF
C
BLANK
DT
D