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reference designNCV898031 | Demoboard AND90136

Onsemi NCV898031 | Demoboard AND90136

SEPIC Converter Analysis and Design

Overview

TopologySEPIC Buck-Boost Topology
Input voltage3.75-9 V
Switching frequency2000 kHz
Output 15.5 V / 1.25 A

Description

The single−ended primary−inductor converter (SEPIC)is a type of DC/DC converter that allows the electricalpotential (voltage) at its output to be greater than, less than,or equal to that at its input. The SEPIC converter iscontrolled by the duty cycle of the main switch Q1.

Features

  • Peak Current Mode Control with Internal Slope Compensation
  • 1.2 V 2% Reference Voltage
  • 2 MHz Fixed Frequency Operation
  • Wide Input Voltage Range of 3.2 V to 40 V, 45 V Load Dump
  • Input Under voltage Lockout (UVLO)
  • Internal Soft−Start
  • Low Quiescent Current in Sleep Mode (< 10 A Typical)
  • Cycle−by−Cycle Current Limit Protection
  • Hiccup−Mode Overcurrent Protection (OCP)
  • Hiccup−Mode Short−Circuit Protection (SCP)
  • Thermal Shutdown (TSD)
  • NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable
  • This is a Pb−Free Device

Typical applications

  • Headlamps, Backlighting
  • Small Form Factor Point−of−Load Power Regulation

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
C
Tol. C
VR(V (DC))
Size
Operating Temperature
DF(%)
RISO
Ceramic Type
L(mm)
W(mm)
H(mm)
Fl(mm)
Packaging
L(µH)
IRP,40K(A)
ISAT(A)
RDC max.(mΩ)
fres(MHz)
Version
SamplesAvailability & Sample
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885012209026
SPECWCAP-CSGP MLCCs 25 V(DC), 3.3 µF, ±10%
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 25 V(DC)
Capacitance3.3 µF
Capacitance±10% 
Rated Voltage25 V (DC)
Size1210 
Operating Temperature -55 °C up to +125 °C
Dissipation Factor3.5 %
Insulation Resistance0.2 GΩ
Ceramic TypeX7R Class II 
Length3.2 mm
Width2.5 mm
Height1.6 mm
Pad Dimension0.75 mm
Packaging7" Tape & Reel 
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885012208068
SPECWCAP-CSGP MLCCs 25 V(DC), 4.7 µF, ±10%
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 25 V(DC)
Capacitance4.7 µF
Capacitance±10% 
Rated Voltage25 V (DC)
Size1206 
Operating Temperature -55 °C up to +125 °C
Dissipation Factor7 %
Insulation Resistance0.1 GΩ
Ceramic TypeX7R Class II 
Length3.2 mm
Width1.6 mm
Height1.6 mm
Pad Dimension0.6 mm
Packaging7" Tape & Reel 
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7447783033
SPECWE-PD SMT Power Inductor, –, –

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PD SMT Power Inductor
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Size7332 
Operating Temperature -40 °C up to +150 °C
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Length7.3 mm
Width7.4 mm
Height3.2 mm
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Inductance3.3 µH
Performance Rated Current5.7 A
Saturation Current5.3 A
DC Resistance24 mΩ
Self Resonant Frequency51 MHz
VersionPerformance 
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