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参数资料
| 型号： | L9468N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, SFM8 |
| 封装： | MULTIWATT-8 |
| 文件页数： | 5/8页 |
| 文件大小： | 175K |
| 代理商： | L9468N |
5/8
L9468
3FAULT
The following table lists the conditions that cause the fault lamp driver to function. To prevent lamp flicker, spe-
cific faults are required to be present for TDELAY seconds before the lamp driver is activated. This delay is
indicated in the table.
Table 7.
Table 8. Regulation Features
Notes:
6.
Lamp and Ignition are cooperative. Either can turn on the device when the other is left open or held low. When both go below
their minimum thresholds the L9468 goes into "L" Terminal Control (LTC). The L9468 will remain in LTC until the phase (P) voltage
drops below VP2 and the frequency drops below fIRF at the VP1 threshold then the L9468 is disabled.
7.
This threshold on the phase signal is used to detect the phase frequency, fIFR, for the Initiation of field regulation.
8.
This threshold on the phase signal is used to sense the presence of the phase for fault detection purposes.
9.
This is the time duration the L9468 takes to rump up from 0 % to 100% duty cycle in response to an increased load on the enerator.
The LRC ratio is set 1:4 and the Vreg comparator status is latched at foundamental frequency rate.
10. Cut-back occurs when both the "L" and "I" terminals are LOW . If the "I" terminal is disconnected it will assume a logic LOW
allowing the "L" terminal to perform the function alone. In cut-back, to prevent the loss of phase signal, a 31.25% duty cycle is
applied to field output when phase drops below Vp2
Conditions
Delay
1. Key-on (wiring check), lamp stays on for 1 ± 0.15 sec regardless
other conditions
No
2. VGO / S> VOV
Yes
3. VGO / S < undervoltage threshold voltage AND Phase frequency > fLRC
Yes
4. Phase Voltage < VP2 AND VGO / S < setpoint
Yes
5. Phase frequency < fIFR
Yes
6. No connection between Battery and VGO
No
7. FAILSAFE
Yes
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VLON
Lamp term turn on threshold 6
0.8
1
1.15
V
ILON
Lamp term current sensitivity
VL = 1 V to Vsp
0.09
0.78
mA
VP1
Initiation of regulation detection
phase voltage threshold 7
IP = 1mA (sinking current)
2.5
3
3.5
V
VP2
Fault detection phase voltage
threshold 8
7
89V
IP
Sinking current @ P terminal
VP = 1.5V
0.5
1
1.8
mA
fIFR
Initiation of field regulation
frequency
53.04
61
70.15
Hz
FSDF
Field Strobe Duty Factor
@ "power up" with fPHASE < fIFR
31.25
%
LRC
Load Response Control rate 9
2.125
2.5
2.875
s
fLRC
LRC transition frequency
LRC is enabled below this value
263.5
310
356.5
Hz
VLCB
"L" term. Cut-Back Setpoint
"L" = 0V, "I" = 0V 10
VS-
20%
VS-
25%
VS-30%
V
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