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NCV887720D1R2G Datasheet(PDF) 10 Page - ON Semiconductor

Part # NCV887720D1R2G
Description  Automotive Grade Start-Stop Non-Synchronous Boost Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV887720D1R2G Datasheet(HTML) 10 Page - ON Semiconductor

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NCV8877
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10
THEORY OF OPERATION
+
Figure 16. Current Mode Control Schematic
Oscillator
Slope
Compensation
Q
S
R
NCV8877
Voltage
Error
VEA
CSA
PWM Comparator
Gate
Drive
L
ISNS
GDRV
VOUT
WAKEUP
ROSC
DISB
DISABLE
RL
CO
VOUT
VIN
RSNS
ROSC
VC
RDAMP
CDECOUPLING
GND
DISB
The DISB pin provides an IC disable function. When a DC
logic-low voltage is applied to this pin, the NCV8877 enters
a low quiescent sleep mode, permitting an external signal to
either shutdown the IC or disable the wakeup function.
Regulation
The NCV8877 is a non−synchronous boost controller
designed to supply a minimum output voltage during
Start−Stop vehicle operation battery voltage sags. The
NCV8877 is in low quiescent current sleep mode under
normal battery operation (12 V) and is enabled when the
supply voltage drops below the descending threshold (7.3 V
for the NCV887700). Boost operation is initiated when the
supply voltage is below the regulation set point (6.8 V for the
NCV887700). Once the supply voltage sag condition ends
and begins to increase, the NCV8877 boost operation will
cease when the supply voltage increases beyond the
regulation set point. The NCV8877 low quiescent current
sleep mode resumes once the supply voltage increases
beyond the ascending voltage threshold (7.6 V for the
NCV887700).
The NCV8877 VOUT pin serves the dual purpose: (1)
powering the NCV8877 and (2) providing the regulation
feedback signal. The feedback network is imbedded within
the IC to eliminate the constant current battery drain that would
exist with the use of external voltage feedback resistors.
There is no soft−start operating mode. The NCV8877 will
instantly respond to a voltage sag so as to maintain normal
operation of downstream loads. Once the NCV8877 is
enabled, the voltage error operational transconductance
amplifier supplies current to set VC to 1.1 V to minimize the
feedback loop response time when the battery voltage sag
goes below the regulation set point.
Current Mode Control
The NCV8877 incorporates a current mode control
scheme, in which the PWM ramp signal is derived from the
power switch current. This ramp signal is compared to the
output of the error amplifier to control the on−time of the
power switch. The oscillator is used as a fixed−frequency
clock to ensure a constant operational frequency. The
resulting control scheme features several advantages over
conventional voltage mode control. First, derived directly
from the inductor, the ramp signal responds immediately to
line voltage changes. This eliminates the delay caused by the
output filter and the error amplifier, which is commonly
found in voltage mode controllers. The second benefit
comes from inherent pulse−by−pulse current limiting by
merely clamping the peak switching current. Finally, since
current mode commands an output current rather than
voltage, the filter offers only a single pole to the feedback
loop. This allows for a simpler compensation.
The NCV8877 also includes a slope compensation
scheme in which a fixed ramp generated by the oscillator is
added to the current ramp. A proper slope rate is provided to
improve circuit stability without sacrificing the advantages
of current mode control.
Current Limit
The NCV8877 features two current limit protections,
peak current mode and over current latch off. When the
current sense amplifier detects a voltage above the peak
current limit between ISNS and GND after the current limit
leading edge blanking time, the peak current limit causes the
power switch to turn off for the remainder of the cycle. Set
the current limit with a resistor from ISNS to GND, with R
= VCL / Ilimit.


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