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NCV887001D1R2G Datasheet(PDF) 7 Page - ON Semiconductor

Part # NCV887001D1R2G
Description  Automotive Grade Non-Synchronous Boost Controller
Download  16 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV887001D1R2G Datasheet(HTML) 7 Page - ON Semiconductor

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NCV8870
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7
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 8. Enable Pulldown Current vs. Voltage
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Enable Pulldown Current vs.
Temperature
012
3
4
Venable, VOLTAGE (V)
TJ = 25°C
56
−40
10
60
110
160
0
1
2
3
4
5
7
6
5.0
5.5
6.0
6.5
7.0
7.5
8.0
THEORY OF OPERATION
Figure 10. Current Mode Control Schematic
Oscillator
Q
S
R
NCV8870
Voltage Error
VEA
CSA
PWM Comparator
Gate
Drive
Compensation
VIN
L
ISNS
GDRV
CO
RL
VFB
VOUT
−
+
+
−
+
−
+
Current Mode Control
The NCV8870 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 NCV8870 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.


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