NCV887001D1R2G datasheet(10/16 Pages) ONSEMI

Part #	NCV887001D1R2G

Description	Automotive Grade Non-Synchronous Boost Controller

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NCV8870

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10

7. Select Compensator Components

Current Mode control method employed by the NCV8870

allows the use of a simple, Type II compensation to optimize

the dynamic response according to system requirements.

8. Select MOSFET(s)

In order to ensure the gate drive voltage does not drop out

the MOSFET(s) chosen must not violate the following

inequality:

Q

g(total) v

I

drv

fs

Where: Qg(total): Total Gate Charge of MOSFET(s) [C]

Idrv: Drive voltage current [A]

fs: Switching Frequency [Hz]

The maximum RMS Current can be calculated as follows:

I

Q(max) + Iout

D

The maximum voltage across the MOSFET will be the

maximum output voltage, which is the higher of the

maximum input voltage and the regulated output voltaged:

V

Q(max) + VOUT(max)

9. Select Diode

The output diode rectifies the output current. The average

current through diode will be equal to the output current:

I

D(avg) + IOUT(max)

Additionally, the diode must block voltage equal to the

higher of the output voltage and the maximum input voltage:

V

D(max) + VOUT(max)

The maximum power dissipation in the diode can be

calculated as follows:

P

D + Vf (max) IOUT(max)

Where: Pd: Power dissipation in the diode [W]

Vf(max): Maximum forward voltage of the diode [V]

10. Determine Feedback Loop Compensation Network

The purpose of a compensation network is to stabilize the

dynamic response of the converter. By optimizing the

compensation network, stable regulation response is

achieved for input line and load transients.

Compensator design involves the placement of poles and

zeros in the closed loop transfer function. Losses from the

boost inductor, MOSFET, current sensing and boost diode

losses

also

influence

the

gain

and

compensation

expressions. The OTA has an ESD protection structure

(RESD

≈ 502 W, data not provided in the datasheet) located

on the die between the OTA output and the IC package

compensation pin (VC). The information from the OTA

PWM feedback control signal (VCTRL) may differ from the

IC-VC signal if R2 is of similar order of magnitude as RESD.

The compensation and gain expressions which follow take

influence from the OTA output impedance elements into

account

.

Type-I compensation is not possible due to the presence

of RESD. The Figures 11 and 12 compensation networks

correspond to a Type-II network in series with RESD.

The resulting control-output transfer function is an accurate

mathematical model of the IC in a boost converter topology.

The model does have limitations and a more accurate SPICE

model should be considered for a more detailed analysis:

• The attenuating effect of large value ceramic capacitors

in parallel with output electrolytic capacitor ESR is not

considered in the equations

.

• The CCM Boost control-output transfer function

includes operating efficiency as a correction factor to

improve modeling accuracy under low input voltage

and high output current operating conditions where

operating losses becomes significant.

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NCV887001D1R2G Datasheet(PDF) 10 Page - ON Semiconductor

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