CS1500_1 CIRRUS [Cirrus Logic], CS1500_1 Datasheet

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CS1500_1

Manufacturer Part Number
CS1500_1
Description
Digital Power Factor Correction IC
Manufacturer
CIRRUS [Cirrus Logic]
Datasheet
Features
Advance Product Information
Cirrus Logic, Inc.
http://www.cirrus.com
Digital EMI Noise Shaping
Excellent Efficiency Under All Load Conditions
Minimal External Devices Required
Optimized Digital Loop Compensation
Comprehensive Safety Features
• Undervoltage Lockout (UVLO)
• Output Overvoltage Protection
• Input Current Limiting
• Output Overpower Protection
• Input Brownout Protection
• Open/short Loop Protection for IAC & FB Pins
• Thermal Shutdown
Mains
AC
& Description
BR1
Digital Power Factor Correction IC
C1
R
C2
AC
VDD
R1a
R1 b
1
3
7
5
Copyright  Cirrus Logic, Inc. 2010
NC
IAC
VDD
GND
This document contains information for a product under development.
Cirrus Logic reserves the right to modify this product without notice.
(All Rights Reserved)
CS1500
L
B
Description
The CS1500 is a high-performance power factor correction (PFC)
controller for universal AC input, which uses a proprietary digital
algorithm for discontinuous conduction mode (DCM) with variable
on-time and variable frequency control, ensuring unity power factor.
The CS1500 incorporates all the safety features necessary for
robust and compact PFC stages. In addition, it has burst mode
control to lower the light-load/standby losses to a minimum.
Protection features such as overvoltage, overcurrent, overpower,
open- and short-circuit protection, overtemperature, and brownout
help protect the device during abnormal transient conditions.
The digital controller optimizes the system stability and transient
performance, simplifies the PFC design, reduces the external
component count and BOM costs. The simple design and
minimum cost makes CS1500 the ideal choice for PFC up to 300
watts.
Pin Assignments
STBY
GD
NC
FB
8
4
2
6
STBY
D1
R3
IAC
NC
FB
1
2
3
4
8-lead SOIC
Q1
D2
R
FB
R2a
R2b
8
7
6
5
CS1500
NC
VDD
GD
GND
C3
DC Output
Regulated
DS849A7
JUL ‘10

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CS1500_1 Summary of contents

Page 1

Digital Power Factor Correction IC Features & Description  Digital EMI Noise Shaping  Excellent Efficiency Under All Load Conditions  Minimal External Devices Required  Optimized Digital Loop Compensation  Comprehensive Safety Features • Undervoltage Lockout (UVLO) • Output ...

Page 2

Pin Name Pin # I STBY 2 IN IAC GND OUT VDD CONFIDENTIAL Table 1. Pin Descriptions NC — No connections Remote On/Off Control ...

Page 3

CHARACTERISTICS AND SPECIFICATIONS 1.1 Absolute Maximum Ratings Pin Symbol Supply Voltage DD 1,2,3,4,8 - Analog Input Maximum Voltage 3,4 - Analog Input Maximum Current 6 V Gate Drive Output Voltage Gate Drive Output ...

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Parameter 2,3 Feedback & Protection 1 Reference Current Output Voltage at Startup Mode Output Voltage at Normal Mode Overvoltage Protection Threshold Overvoltage Protection Hysteresis 2,4 Overpower Protection Threshold 2,4 Overpower Protection Recovery Input Brownout Protection Threshold Input Brownout Recovery Threshold ...

Page 5

TYPICAL ELECTRICAL PERFORMANCE 3 kHz SW(max °C 2 1.5 1 0.5 Falling (V) DD Figure 1. Supply ...

Page 6

Operating 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 Start-up Standby 0 - TEMP ( C) Figure 5. Supply Current ( Sink -60 -40 - ...

Page 7

INTRODUCTION NC 8 IAC 3 VDD The CS1500 digital power factor controller operates in variable on-time, variable frequency, discontinuous conduction mode (DCM). The CS1500 uses a proprietary digital algorithm to maximize the efficiency and ...

Page 8

PFC Operating Frequency One key feature of the CS1500 is its operating frequency profile. Figure 10 illustrates how the frequency varies over half cycle of the line voltage in steady-state operation. When power is first applied to the CS1500, ...

Page 9

P o [W] Burst Threshold Burst Mode Active V in PFC V [V] in Disable Figure 14. Burst Modes 3.4 Output Power and PFC Boost Inductor Maximum output power in normal mode is defined by the following equation: V – ...

Page 10

It is recommended that a ceramic capacitor 2 placed between the IAC pin and the VDD pin to filter noise in the ...

Page 11

R is about 150 s in the CS1500. If the PFC input sense resistor R AC GND), the current reference signal supplied to ...

Page 12

APPLICATION EXAMPLE The following sections describe an example application. The example is based upon the typical connection diagram illustrated in Figure 21 BR1 C1 AC Mains C2 4.1 PFC for Power Supply Application The following design example ...

Page 13

PFC Input Filter Capacitor To achieve unity power factor, a DCM PFC circuit needs an input filtering circuit to bypass the high-frequency current so that the input current consists of the low-frequency portion only. There are two main factors ...

Page 14

----------------------------------------------------------------------------------------- - C = out hold 2 V   out rip ------------------------ - V –   link the ...

Page 15

Summary of Component Values Designator R1a R1b R2a R2b BR1 CS1500 DS849A7 CONFIDENTIAL Value 1.5 M 1.5 M 1.5 M 1.5 M 4.7 0.47 F 0.47 F 100 F, 450V 4A, ...

Page 16

PERFORMANCE PLOTS 100 100 Vin = 115 CONFIDENTIAL Vin=230V Vin=115V Load (%) Figure ...

Page 17

DS849A7 CONFIDENTIAL Vin = 115 Vin = 230 Load (% ) Figure 24. Power Factor vs. Load, Typical CS1500 100 17 ...

Page 18

Figure 25. Load Transient — 20% to 80% ( 240 mA), 0.8 A/ sec Slew, 90 VAC Figure 26. Load Transient — 20% to 80% ( 240 mA), 0.8 A/ sec Slew, 260 VAC 18 CONFIDENTIAL ...

Page 19

Figure 28. Overload — 240 mA to 500 mA, 265 VAC DS849A7 CONFIDENTIAL Figure 27. Overload — 240 mA to 500 mA, 90 VAC CS1500 19 ...

Page 20

DEFINITIONS Variable The efficiency factor. A margin factor to guarantee rated power against tolerances and transients. f The minimum AC line frequency. line(min) I The current generated The current generated The ...

Page 21

PACKAGE DRAWING 8L SOIC (150 MIL BODY) PACKAGE DRAWING 1 b SEATING PLANE e DIM ORDERING INFORMATION Part # CS1500-FSZ 9. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION Model Number CS1500-FSZ ...

Page 22

HISTORY Revision Date A1 APR 2009 A2 JUN 2009 A3 DEC 2009 A4 MAR 2010 A5 MAY 2010 A6 MAY 2010 A7 JUL 2010 Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales ...

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