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参数资料
| 型号： | MC33099 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | Adaptive Alternator Voltage Regulator(自适应交流稳压器) |
| 中文描述： | 自适应发电机电压调节器（自适应交流稳压器） |
| 文件页数： | 11/20页 |
| 文件大小： | 295K |
| 代理商： | MC33099 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33099
11
regulator and activates all other voltage regulators and bias
currents. After engine start, the LRC mode is activated,
independent of the phase frequency or independent of a Wide
Open Throttle condition. When the battery system voltage
increases to V
set
, the regulator resumes the normal operational
mode. After switching the ignition switch to the OFF position,
voltage V
ign
decreases below voltage V
Tign
, causing the
comparator C
ign
to provide an ignition-OFF signal to the Ignition
Delay Circuit. After phase frequency f
ph
< f
1
due to ignition turn
OFF, supply currents and voltages are reduced in the regulator
to provide the standby drain current drain. However, voltage
V
DD
for logic and voltage V
ref
for reference voltages remain
active to be able to sense an ignition input voltage.
In some applications, the ignition input is connected to the
low side of the fault lamp as shown in
Figure 2
, page 9. When
the lamp driver circuitry is generating a lamp ON signal, a lamp
polling signal causes the Lamp Drain output to be periodically
GATED OFF. As a result, voltage V
ign
> V
Tign
during the lamp
OFF polling period, causing comparator C
ign
to periodically
provides an ignition-ON signal to the Ignition Delay Circuit.
During the Lamp On condition, the Ignition Delay Circuit
provides a minimum ignition turn-off delay (t
id(off)
) such that all
currents and regulator voltages remain ON between the Lamp
Off polling pulses.
Battery and Alternator Output Voltage Sensing
The system battery voltage is directly sensed by the
REMOTE input using a remote wire as a Kelvin connection. The
Remote input resistance (R
rem
) at the REMOTE input is
typically 68 k
. The voltage at the Remote Sense input (V
rs
) is
a ratioed value of the Remote voltage (V
rem
). The intended
ratio of V
rem
/V
rs
is about 7.45. The BAT terminal voltage (V
bat
)
is also sensed as an internal Local voltage (V
l
). A Local Sense
voltage (V
ls
) is a ratioed value of voltage V
l
, where the intended
ratio of V
l
/V
ls
is also 7.45. The Local internal connection is
provided for fault protection against the remote wire being
grounded or exhibiting a high remote wire resistance due to
being disconnected or due to a corrosive or loose connection.
Thus the Local connection ensures that alternator regulation of
the system voltage continues in well-defined states for all
possible Remote input fault conditions.
Local and Remote Voltage Processing and Switching
During Remote operation both the external Remote input
connection and internal Local connection senses approximately
the same regulated system voltage of V
set
= 14.8 V. For this
case, voltages V
rs
and V
ls
are approximately 2.0 V. Because
the remote switching comparator C
rs
is referenced to 0.6 V,
both switches S1 and S2 are OPEN and remain open when
voltage V
rs
> 0.6 V or when voltage V
rem
is greater than the
remote loss threshold voltage (V
Trem
). Voltage V
rs
is coupled
to the input of a unity-gain combiner/buffer CB1. Voltage V
ls
is
buffered and coupled to the output of a unity-gain Local Buffer
(LB) and ratioed by the R5/(R4+R5) resistor divider to provide
an input voltage to a unity-gain combiner/buffer CB2. Thus the
voltage at the input of the combiner CB2 is normally 0.8 V
ls
(or
1.6 V typically), while voltage V
rs
on the input of CB1 is typically
2.0 V. Because voltage V
o
reflects the highest voltage at the
input of either combiner, voltage V
o
will be voltage V
rs
in
Remote operation with Remote connected to V
bat
. For this
case, voltage V
rs
is filtered by a 300 Hz low-pass filter and
translated to the FB buffer output. Voltage V
rs
at the FB buffer
output is then compared to a digital-to-analog converter output
voltage ramp (V
dac
) for duty cycle regulation.
During a Remote fault condition when the remote sense line
is OPEN or grounded, voltage V
rs
at the Remote Sense input
will be zero, causing comparator C
rs
to activate switches S1
and S2 to a CLOSED position. As a result, voltage V
ls
is
coupled through buffer LB directly to the input of combiner CB2.
Because the voltage V
ls
on the input of combiner CB2 is greater
than voltage V
rs
(= 0 V) on the input of combiner CB1, voltage
V
ls
is coupled to the output of the combiners as voltage V
o
.
Thus in this fault case, voltage V
ls
is filtered and translated to
the FB buffer output for being compared to voltage ramp V
dac
for regulation.
During a remote fault condition in which the resistance of the
Remote sense wire increases due to the corrosion or a loose
connection, a finite external remote fault resistance occurs
causing voltage V
rem
to decrease, but voltage V
rem
remains
greater than voltage V
Trem
. As a result, switches S1 and S2
remain in an OPEN condition, while the system voltage will
increase due to the effective increase in the Remote resistor
divider ratio. As a result, voltage V
l
increases until the voltage
at the input of combiner CB2 is approximately 2.0 V, or V
ls
is
about 1.2 (2.0 V), or 2.25 V due to the R4/R5 divider ratio.
Because the local divider ratio translates voltage V
ls
to V
bat
by
about factor 7.4, the final regulated output voltage for this
condition is 7.4 (2.25), or 18.5 V. This is the secondary
regulation voltage (V
set2
). When the system voltage increases
to the Overvoltage Threshold (V
Tov
), a fault indication occurs
by the lamp. Thus this particular Remote fault condition
produces a fault indication, but regulates to prevent an extreme
system overvoltage condition. When the Remote fault
resistance becomes great enough to cause voltage
V
rem
< V
Trem
, the regulated system voltage returns to the local
regulation as described for an OPEN or grounded Remote
input.
Internal Clock Oscillator and 8-Bit Counter
An internal clock oscillator is provided having a typical
oscillation frequency (f
osc
) of 101 kHz. The output of the
oscillator is coupled to an 8-bit counter that provides 8 counting
bits to the logic and the four most significant counting bits
(MSB) to the LRC circuitry and to a digital-to-analog converter
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC33099CDW | 制造商:Freescale Semiconductor 功能描述:Adaptive Alternator Voltage Regulator |
| MC33099CDW/R2 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Adaptive Alternator Voltage Regulator |
| MC33099CDWR2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Adaptive Alternator Voltage Regulator |
| MC33099DW | 制造商:Freescale Semiconductor 功能描述:Adaptive Alternator Voltage Regulator |
| MC33099DW/R2 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Adaptive Alternator Voltage Regulator |
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