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NCV887001D1R2G Datasheet(PDF) 15 Page - ON Semiconductor

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

NCV887001D1R2G Datasheet(HTML) 15 Page - ON Semiconductor

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Table 3. OTA COMPENSATION TRANSFER FUNCTION AND COMPENSATION VALUES
Desired OTA Gain at Cross-over Frequency fc (G)
10
desired_G
fc_gain_db
20
Desired Phase Boost at Cross-over Frequency fc (boost)
q
margin * arg Hctrl_output(fc)
180°
p *
90°
p
180°
Select OTA Compensation Zero to Coincide
with Modulator Pole at fp1 (fz)
w
p1e
2
p
Resulting OTA High Frequency Pole Placement (fp)
fzfc ) fc 2 tan(boost)
fc * fz tan(boost)
Compensation Resistor R2
fpG
fp * fz
V
OUT
1.2 gm
1
)
fc
fp
2
1
)
fz
fp
Compensation Capacitor C1
1
2
p fz R
2
Compensation Capacitor C2
1
2
p fpG
@
R
low gm
R
low ) R1
OTA DC Gain (G0_OTA)
R
low
R
low ) R1
@ gm @ R
0
Low Frequency Zero (
wz1e)
1
2
R
2 ) Resd
R
2ResdC2
1
*
1
* 4
R
2ResdC2
R
2 ) Resd
2
C
1
High Frequency Zero (
wz2e)
1
2
R
2 ) Resd
R
2ResdC2
1
)
1
* 4
R
2ResdC2
R
2 ) Resd
2
C
1
Low Frequency Pole (
wp1e)
1
2
R
0 ) R2 ) Resd
R
2 R0 ) Resd C2
1
*
1
* 4
R
2 R0 ) Resd C2
R
0 ) R2 ) Resd
2
C
1
High Frequency Pole (
wp2e)
1
2
R
0 ) R2 ) Resd
R
2 R0 ) Resd C2
1
)
1
* 4
R
2 R0 ) Resd C2
R
0 ) R2 ) Resd
2
C
1
OTA Transfer Function (GOTA(f))
-G
0_OTA
1
) j
2
pf
w
z1e
1
) j
2
pf
w
p1e
1
) j
2
pf
w
z2e
1
) j
2
pf
w
p2e
The open-loop-response in closed-loop form to verify the
gain/phase margins may be obtained from the following
expression.
T(f)
+ G
OTA(f) Hctrl_output(f)
Low Voltage Operation
If the input voltage drops below the UVLO or MOSFET
threshold voltage, another voltage may be used to power the
device. Simply connect the voltage you would like to boost
to the inductor and connect the stable voltage to the VIN pin
of the device. In boost configuration, the output of the
converter can be used to power the device. In some cases it
may be desirable to connect 2 sources to VIN pin, which can
be accomplished simply by connecting each of the sources
through a diode to the VIN pin.


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