NCV887740D1R2G datasheet(12/15 Pages) ONSEMI

Part #	NCV887740D1R2G

Description	Automotive Grade Start-Stop Non-Synchronous Boost Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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NCV8877

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Rds(on)

Vd

L

Ri

COUT

VOUT

C1

R2

VIN

rL

rCf

C2

ROUT

GND

ISNS

VOUT

GDRV

VC

VCTRL

OTA

RESD

R1

RLOW

R0

VREF

Figure 16. NCV8877 OTA and Compensation

A worksheet as well as a SPICE model which may be used

for selecting compensation components R2, C1, C2 is

available

at

the

ON

Semiconductor

web

site

(http://onsemi.com/PowerSolutions/product.do?id=NCV8

877). The following equations may be used to analyze the

Figure 1

0 boost converter. Required input design parameters

for analysis are:

Vd = Boost diode Vf (V)

VIN = Boost supply input voltage (V)

Ri = Current sense resistor (

W)

RDS(on) = MOSFET RDS(on) (

W)

COUT = Bulk output capacitor value (F)

Rsw_eq = RDS(on) + Ri, for the boost continuous

conduction mode (CCM) expressions

rCF = Bulk output capacitor ESR (

W)

ROUT = Equivalent resistance of output load (

W)

Pout = Output Power (W)

L = Boost inductor value (H)

rL = Boost inductor ESR (

W)

Ts = 1/fs, where fs = clock frequency (Hz)

VOUT = Device specific output voltage (e.g. 6.8 V

for NCV887701) (V)

Vref = OTA internal voltage reference = 1.2 V

R0 = OTA output resistance = 3 MW

Sa = IC slope compensation (e.g. 53 mV/

ms for

NCV887701)

gm = OTA transconductance = 1.2 mS

D = Controller duty ratio

D’ = 1 − D

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NCV887740D1R2G Datasheet(PDF) 12 Page - ON Semiconductor

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