L6227Q STMicroelectronics, L6227Q Datasheet - Page 13

• Manufacturer Part Number: L6227Q
• Description: IC DRIVER FULL BRDG PWM 32VFQFPN
• Manufacturer: STMicroelectronics
• Type: H Bridger

Specifications of L6227Q

• 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: 32-VFQFN, 32-VFQFPN
• Product: H-Bridge Drivers
• Rise Time: 250 ns
• Fall Time: 250 ns
• Supply Voltage (min): 8 V
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Bridge Type: Full Bridge
• Maximum Turn-on Delay Time: 1900 ns
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 2
• For Use With: 497-6817 - EVAL BOARD FOR L6227Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6227Q
Figure 10
across the sensing resistor, the RC pin voltage and the status of the bridge. Immediately
after the low-side power MOS turns on, a high peak current flows through the sensing
resistor due to the reverse recovery of the freewheeling diodes. The L6227Q provides a 1 µs
blanking time t
prematurely re-trigger the monostable.
Figure 10. Output current regulation waveforms
Figure 11
approximately calculated from the equations:
where R
Dead Time with:
Therefore:
R
V
V
SENSE
SENSE
I
OUT
t
t
20 kΩ ≤ R
0.47 nF ≤ C
t
t
t
V
REF
2.5V
OFF
V
RCFALL
OFF
DT
OFF(MIN)
OFF(MAX)
ON
5V
REF
0
RC
OFF
= 1 µs (typical value)
= t
shows the magnitude of the off time t
shows the typical operating waveforms of the output current, the voltage drop
SYNCHRONOUS OR QUASI
SYNCHRONOUS RECTIFICATION
D01IN1334
RCFALL
and C
= 0.6 · R
OFF
= 6.6 µs
BLANK
= 6 ms
OFF
≤ 100 kΩ
OFF
that inhibits the comparator output so that this current spike cannot
+ t
≤ 100 nF
OFF
DT
are the external component values and t
= 0.6 · R
· C
OFF
OFF
B
· C
Slow Decay
t
RCFALL
OFF
1µs t
1µs t
t
t
RCRISE
OFF
C
+ t
BLANK
DT
OFF
DT
D
versus C
t
ON
A
OFF
B
DT
and R
Slow Decay
is the internally generated
t
RCFALL
1µs t
1µs t
t
t
RCRISE
OFF
C
OFF
Circuit description
BLANK
DT
values. It can be
D
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