L6562D

Product Summary

The L6562 is a current-mode PFC controller operating in Transition Mode (TM). Pin-to-pin compatible with the predecessor L6561, it offers improved
performance.

The highly linear multiplier includes a special circuit, able to reduce AC input current distortion, that allows
wide-range-mains operation with an extremely low THD, even over a large load range.
The output voltage is controlled by means of a voltage-mode error amplifier and a precise (1% @Tj =
25°C) internal voltage reference.
The device features extremely low consumption (≤70 μA before start-up and <4 mA running) and includes
a disable function suitable for IC remote ON/OFF, which makes it easier to comply with energy saving
norms (Blue Angel, EnergyStar, Energy2000, etc.).
An effective two-step OVP enables to safely handle overvoltages either occurring at start-up or resulting
from load disconnection.
The totem-pole output stage, capable of 600 mA source and 800 mA sink current, is suitable for big MOSFET or IGBT drive which, combined with the other features, makes the device an excellent low-cost solution for EN61000-3-2 compliant SMPS's up to 300W.

 

Parametrics

N° Pin Function
1 INV Inverting input of the error amplifier. The information on the output voltage of the PFC preregulator is fed into the pin through a resistor divider.
2 COMP Output of the error amplifier. A compensation network is placed between this pin and INV (pin
#1) to achieve stability of the voltage control loop and ensure high power factor and low THD.
3 MULT Main input to the multiplier. This pin is connected to the rectified mains voltage via a resistor
divider and provides the sinusoidal reference to the current loop.
4 CS Input to the PWM comparator. The current flowing in the MOSFET is sensed through a resistor,
the resulting voltage is applied to this pin and compared with an internal sinusoidal-shaped
reference, generated by the multiplier, to determine MOSFET’s turn-off.
5 ZCD Boost inductor’s demagnetization sensing input for transition-mode operation. A negative-going
edge triggers MOSFET’s turn-on.
6 GND Ground. Current return for both the signal part of the IC and the gate driver.
7 GD Gate driver output. The totem pole output stage is able to drive power MOSFET’s and IGBT’s
with a peak current of 600 mA source and 800 mA sink. The high-level voltage of this pin is
clamped at about 12V to avoid excessive gate voltages in case the pin is supplied with a high
Vcc.
8 Vcc Supply Voltage of both the signal part of the IC and the gate driver. The supply voltage upper
limit is extended to 22V min. to provide more headroom for supply voltage changes.
Table 5. Electrical Characteristics
(Tj
 = -25 to 125°C, VCC = 12, CO = 1 nF; unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY VOLTAGE
VCC Operating range After turn-on 10.3 22 V
VCCon Turn-on threshold (1) 11 12 13 V
VCCOff Turn-off threshold (1) 8.7 9.5 10.3 V
Hys Hysteresis 2.2 2.8 V
VZ Zener Voltage ICC = 20 mA 22 25 28 V
SUPPLY CURRENT
Istart-up Start-up Current Before turn-on, VCC =11V 40 70 μA
Iq Quiescent Current After turn-on 2.5 3.75 mA
ICC Operating Supply Current @ 70 kHz 3.5 5 mA
Iq Quiescent Current During OVP (either static or
dynamic) or VZCD =150 mV
2.2 mA
MULTIPLIER INPUT
IMULT Input Bias Current VVFF = 0 to 4 V -1

Features

1 Features
■ REALISED IN BCD TECHNOLOGY
■ TRANSITION-MODE CONTROL OF PFC PREREGULATORS
■ PROPRIETARY MULTIPLIER DESIGN FOR
MINIMUM THD OF AC INPUT CURRENT
■ VERY PRECISE ADJUSTABLE OUTPUT
OVERVOLTAGE PROTECTION
■ ULTRA-LOW (≤70μA) START-UP CURRENT
■ LOW (≤4 mA) QUIESCENT CURRENT
■ EXTENDED IC SUPPLY VOLTAGE RANGE
■ ON-CHIP FILTER ON CURRENT SENSE
■ DISABLE FUNCTION
■ 1% (@ Tj = 25 °C) INTERNAL REFERENCE
VOLTAGE
■ -600/+800mA TOTEM POLE GATE DRIVER WITH
UVLO PULL-DOWN AND VOLTAGE CLAM

■ DIP-8/SO-8 PACKAGES ECOPACK
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Diagrams