The MC34262 MC33262 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off–line power converter applications These integrated circuits feature an internal startup timer for stand–alone applications a one quadrant multiplier for near unity power factor zero current detector to ensure critical conduction operation transconductance error amplifier quickstart circuit for enhanced startup trimmed internal bandgap reference current sensing comparator and a totem pole output ideally suited for driving a power MOSFET

Amanda

Description

Niveau: Supérieur, Doctorat, Bac+8
Power Factor Controllers The MC34262/MC33262 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off–line power converter applications. These integrated circuits feature an internal startup timer for stand–alone applications, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction operation, transconductance error amplifier, quickstart circuit for enhanced startup, trimmed internal bandgap reference, current sensing comparator, and a totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of an overvoltage comparator to eliminate runaway output voltage due to load removal, input undervoltage lockout with hysteresis, cycle–by–cycle current limiting, multiplier output clamp that limits maximum peak switch current, an RS latch for single pulse metering, and a drive output high state clamp for MOSFET gate protection. These devices are available in dual–in–line and surface mount plastic packages. • Overvoltage Comparator Eliminates Runaway Output Voltage • Internal Startup Timer • One Quadrant Multiplier • Zero Current Detector • Trimmed 2% Internal Bandgap Reference • Totem Pole Output with High State Clamp • Undervoltage Lockout with 6.0 V of Hysteresis • Low Startup and Operating Current • Supersedes Functionality of SG3561 and TDA4817 Simplified Block Diagram Voltage Feedback Input Multiplier, Latch, PWM, Timer, & Logic Error Amp Multiplier Undervoltage Lockout 2.5V Reference Zero Current Detector 5 8 6 7 4 3 2 1 Drive Output Gnd Zero Current Detect Input Multiplier Input Compensation V

• voltage feedback


• current sense


• operating ambient


• output voltage


• input threshold


• ambient temperature


• voltage range


• power supply

Sujets

• Régulation
• Room temperature
• Power supply

Informations

• Publié par: profil-zyak-2012
• Nombre de lectures: 54
• Langue: English

Extrait

ON Semiconductor

Power Factor Controllers The MC34262/MC33262 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off±line power converter applications. These integrated circuits feature an internal startup timer for stand±alone applications, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction operation, transconductance error amplifier, quickstart circuit for enhanced startup, trimmed internal bandgap reference, current sensing comparator, and a totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of an overvoltage comparator to eliminate runaway output voltage due to load removal, input undervoltage lockout with hysteresis, cycle±by±cycle current limiting, multiplier output clamp that limits maximum peak switch current, an RS latch for single pulse metering, and a drive output high state clamp for MOSFET gate protection. These devices are available in dual±in±line and surface mount plastic packages. • Overvoltage Comparator Eliminates Runaway Output Voltage • Internal Startup Timer • One Quadrant Multiplier • Zero Current Detector • Trimmed 2% Internal Bandgap Reference • Totem Pole Output with High State Clamp • Undervoltage Lockout with 6.0 V of Hysteresis • Low Startup and Operating Current • Supersedes Functionality of SG3561 and TDA4817 Simplified Block Diagram

Multiplier Input

Zero Current Detector

2.5V Reference

Gnd 6

Multiplier Latch PWM Timer  & Logic

Multiplier

Undervoltage Lockout

Overvoltage Comparator   1.08 V ref Error Amp   V ref Quickstart

Compensation

Semiconductor Components Industries, LLC, 2001 March, 2001 ± Rev. 2

2

Zero Current 5 Detect Input

V CC 8

Drive Output 7 Current Sense Input 4

Voltage Feedback 1 Input

1

8

8

1

MC34262 MC33262

1

POWER FACTOR CONTROLLERS

SEMICONDUCTOR TECHNICAL DATA

P SUFFIX PLASTIC PACKAGE CASE 626

D SUFFIX PLASTIC PACKAGE CASE 751 (SO±8)

PIN CONNECTIONS

Voltage Feedback Input 1 Compensation 2 Multiplier Input  3 Current Sense 4 Input  Top View)

8 V CC 7 Drive Output 6 Gnd 5 Ze D r e o t   e C ct u  I r n re p n u t t

ORDERING INFORMATION Operating Device Temperature Range  Package MC34262D SO±8 T A = 0°to +85°C MC34262P Plastic DIP MC33262D T A = ±40° to C SO±8 +105° MC33262P Plastic DIP

Publication Order Number: MC34262/D

MAXIMUM RATINGS

MC34262 MC33262

Rating Symbol Value Unit Total Power Supply and Zener Current (I CC + I Z ) 30 mA Output Current, Source or Sink (Note 1) I O 500 mA Current Sense, Multiplier, and Voltage Feedback Inputs V in ±1.0 to +10 V Zero Current Detect Input I in mA High State Forward Current 50 Low State Reverse Current ±10 Power Dissipation and Thermal Characteristics P Suffix, Plastic Package, Case 626 Maximum Power Dissipation @ T A = 70°C P D 800 mW Thermal Resistance, Junction±to±Air R ∉ JA 100°C/W D Suffix, Plastic Package, Case 751 Maximum Power Dissipation @ T A = 70°C P D 450 mW Thermal Resistance, Junction±to±Air  R ∉ JA 178°C/W Operating Junction Temperature T J +150°C Operating Ambient Temperature (Note 3) T A °C MC34262 0 to + 85 MC33262 ± 40 to +105 Storage Temperature T stg ± 65 to +150°C ELECTRICAL CHARACTERISTICS (V CC = 12 V (Note 2), for typical values T A = 25°C, for min/max values T A is the operating ambient temperature range that applies [Note 3], unless otherwise noted.) Characteristic Symbol Min Typ Max Unit ERROR AMPLIFIER Voltage Feedback Input Threshold V FB V T A = 25° 2.5 2.535C 2.465 T A = T low to T high (V CC  2.54 Ð 2.44= 12 V to 28 V) Line Regulation (V CC = 12 V to 28 V, T A = 25°C) Reg line Ð 1.0 10 mV Input Bias Current (V FB  I= 0 V) IB Ð ± ± 0.1 0.5∝A Transconductance (T A = 25°C) g m  13080 100∝mho Output Current I O ∝A Source (V FB  Ð= 2.3 V) Ð 10 Sink (V FB  Ð= 2.7 V) Ð 10 Output Voltage Swing V High State (V FB = 2.3 V) V OH(ea)  Ð5.8 6.4 Low State (V FB = 2.7 V) V OL(ea)  2.4Ð 1.7 OVERVOLTAGE COMPARATOR Voltage Feedback Input Threshold V FB(OV) 1.065 V FB 1.08 V FB 1.095 V FB V MULTIPLIER Input Bias Current, Pin 3 (V FB = 0 V) I IB Ð ± 0.1 ± 0.5∝A Input Threshold, Pin 2 V th(M) 1.05 V OL(EA) 1.2 V OL(EA) Ð V Dynamic Input Voltage Range V Multiplier Input (Pin 3) V Pin 3  00 to 2.5 Ð to 3.5 Compensation (Pin 2) V Pin 2 V th(M) to V th(M) to Ð   (V th(M) + 1.0) (V th(M) + 1.5) Multiplier Gain (V Pin 3 = 0.5 V, V Pin 2 = V th(M) + 1.0 V) (Note 4) K 0.43 0.65 0.87 1/V ZERO CURRENT DETECTOR Input Threshold Voltage (V in Increasing) V th 1.33 1.6 V 1.87 Hysteresis (V in Decreasing) V H 100 200 300 mV Input Clamp Voltage V High State (I DET  V= + 3.0 mA) IH 6.1 6.7 Ð Low State (I DET = ± 3.0 mA) V IL 0.3 0.7 1.0 http://onsemi.com 2