CS1500-FSZ

CS1500-FSZ Datasheet


CS1500

Part Datasheet
CS1500-FSZ CS1500-FSZ CS1500-FSZ (pdf)
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Nov CONFIDENTIAL

CS1500

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 Overvoltage Protection
• Input Current Limiting
• Open/short Loop Protection for IAC & IFB Pins
• Thermal Shutdown

Applications & Description

LCD and LED TVs Monitor Supplies Battery Chargers

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, open- and short-circuit protection, and overtemperature 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.
Ordering Information

See page

AC Mains
4 IFB 3

CS1500

C3 Regulated

DC Output

Cirrus Logic, Inc.

Copyright Cirrus Logic, Inc. 2010 All Rights Reserved

NOV ‘10 DS849F1

Nov CONFIDENTIAL

INTRODUCTION

IAC 3
15k 24 k

IFB 4
15k 24 k

Voltage Regulator
- V th ST

V th STP

CS1500
7 VDD 6 GD 5 GND

Figure CS1500 Block Diagram

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 reduce the conductive EMI.

The analog-to-digital converter ADC shown in the CS1500 block diagram in Figure 9 is used to sense the PFC output voltage Vlink and the rectified AC line voltage Vrect by measuring currents through their respective resistors. The magnitudes of these currents are measured as a proportion of a reference current IREF that functions as the reference for the ADCs. The digital signal is then processed in a control algorithm which determines the behavior of the CS1500 during start-up, normal operation, and under fault conditions, such as overvoltage, and over-temperature conditions.

The CS1500 PFC switching frequency varies with the Vrect on a cycle-by-cycle basis, and its digital algorithm calculates the on-time accordingly for unity power factor. Unlike traditional Critical Conduction Mode CRM PFC controller, CS1500 operates at its low switching frequency near the zero-crossing point of the AC input voltage, and it operates at its high switching frequency at the peak of its AC input voltage this is the opposite of the switching frequency profile for a CRM PFC controller , thus CS1500 reduces switching losses especially under light-load conditions, spreads conducted EMI energy peaks over a wide frequency band and increases overall system efficiency.

The proprietary digital control engine optimizes the feedback error signal using an adaptive control algorithm, improves
system stability and transient response. No external feedback error signal compensation components are required.

The CS1500s digital controller algorithm limits the ON time of the Power MOSFET by the following equation:

Where Ton is the max time that the power MOSFET is turned on and Vrect is the rectified line voltage. In the event of a sudden line surge or sporadic, high dv/dt line voltages, this equation may not limit the ON time appropriately. For this type of line disturbance, additional protection mechanisms such as fusible resistors, fast-blow fuses, or other current-limiting devices are recommended.

Under steady-state conditions, the voltage loop keeps PFC output voltage close to its nominal value. Under light load startup or feedback loop open conditions, the output voltage may pass the overvoltage protection threshold. The digital control engine initiates a fast response loop to shut down gate driving signal to reduce the energy delivered to the output for PFC capacitor protection. When the link voltage drop below VOVP-VOVP Hy , PFC resumes normal operation.

DS849F1

PIN DESCRIPTION

Nov CONFIDENTIAL

CS1500

No Connec tion No Connec tion Rec tifier V oltage S ens e Link V oltage S ens e
8 NC 7 VDD 6 GD 5 GND
8-lead S OIC

No Connec tion IC S upply V oltage P FC Gate Driv er Ground

Pin Name NC IAC

Pin # 1,2,8

Figure CS1500 Pin Assignments
ORDERING INFORMATION

Part # CS1500-FSZ

Temperature Range -40 °C to +125 °C

Package Description 8-lead SOIC, Lead Pb Free
10.ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION

Model Number

Peak Reflow Temp

MSL Ratinga

CS1500-FSZ
260 °C
a. MSL Moisture Sensitivity Level as specified by IPC/JEDEC J-STD-020. b. Stored at 30 °C, 60% relative humidity.

Max Floor Lifeb 365 Days

DS849F1

Nov CONFIDENTIAL

CS1500
11.REVISION HISTORY

Date JUL 2010 NOV 2010

Contacting Cirrus Logic Support

For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to

IMPORTANT NOTICE

Cirrus Logic, Inc. and its subsidiaries “Cirrus” believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind express or implied . Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE "CRITICAL APPLICATIONS" . CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.

Cirrus Logic, Cirrus, the Cirrus Logic logo designs, EXL CORE, and the EXL CORE logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners.

DS849F1
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Datasheet ID: CS1500-FSZ 523138