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L9177ATR Datasheet(PDF) 41 Page - STMicroelectronics

Part # L9177ATR
Description  Automotive engine management control IC for small engines
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9177ATR Datasheet(HTML) 41 Page - STMicroelectronics

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Figure 36. Low side drivers slew rate
GAPGPS00619
IP2
IP1
IN1
IN2
IN1
IP1
Igate
Vgate
Igate
Vgate
VOUT
VOUT
IOUT
VLVT
VLVT
80%
20%
not controlled
IOUT
not controlled
At switch-on command the charging current is provided by current generator IP1 and is kept constant until the
output voltage is decreased of roughly 80% of typical battery level. At this point the low side transistor is on and
VLVT signal is set to logic 1 to connect IP2 current generator in parallel with IP1, completing the gate charge
curve and providing maximum gate drive.
When the power transistor is switched-off the gate is discharged quickly using both IN1 and IN2 currents; as soon
as the output voltage reaches roughly 20 % of the nominal battery voltage only IN1 is kept connected to complete
the gate discharging.
In Table 33 the values for IPx and INx current generators are reported for each low side.
As an example Figure 37 shows the resulting slew rate, in typical conditions, of O2H low side driver.
Table 33. Values for IPx and INx current generators for each low side
Low side
IP1
IP2
IN1
IN2
Unit
O2H
243
81
253
337
µA
INJ
174
23
180
124
µA
RLY’s
78
0
80
120
µA
L
78
0
62
119
µA
TACH
22
0
21
25
µA
L9177A
Low side drivers
DS12175 - Rev 5
page 41/55



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