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PDF ( 数据手册 , 数据表 ) L8565

零件编号 L8565
描述 HIGH PERFORMANCE POWER FACTOR CORRECTION CONTROLLER
制造商 Unisonic Technologies
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L8565 数据手册, 描述, 功能
UNISONIC TECHNOLOGIES CO., LTD
L8565
Preliminary
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE POWER
FACTOR CORRECTION
CONTROLLER IN CONTINUOUS
CONDUCTION MODE
DESCRIPTION
The UTC L8565 is a wide input range controller integrated circuit for
active power factor correction. The circuit is designed for boost PFC
application, and requires reduced external component count. Its power
supply is recommended to be provided by an external auxiliary supply
which will switch on and off the IC.
The circuit operates in the continuous conduction mode under average
current, and in discontinuous conduction mode only in light load
condition. The switching frequency can be set with the external resistor at
pin 4. Both current and voltage loop compensations are done externally
to allow full user control.
There are many kinds of protection features incorporated to make sure of safe system operation conditions, such as
brown-out protection, output under voltage detection and peak current limitation. The inside reference is adjusted
(5V±2%) to make sure control level and precise protection. There is a particular soft-start function to limit the start up
current and thus reduces the stress on the boost diode.
FEATURES
* Supports wide input range
* Average current control
* Ease of use with few external components
* External current and voltage loop compensation
* Trimmed internal reference voltage (5V±2%)
* Programmable operating/switching frequency
* (50kHz ~ 250kHz)
* Max duty cycle of 95% (typ) at 125kHz
* Under voltage lockout
* Cycle by cycle peak current limiting
* Over-voltage protection
* Open loop detection
* Output under-voltage detection
* Brown-out protection
* Soft Over current Protection
* Enhanced dynamic response
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
L8565L-S08-R
L8565G-S08-R
L8565L-S08-T
L8565G-S08-T
Package
SOP-8
SOP-8
Packing
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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L8565 pdf, 数据表
L8565
Preliminary
LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION(Cont.)
4.1 Brown-Out Protection (BOP)
Input Brown-out occurs if the input voltage VIN falls below the minimum input voltage of the design (i.e. 85V for
universal input voltage range) and the VCC has not entered into the VCC under voltage lockout level yet. For a system
without BOP, the boost converter will increasingly draw a higher current from the mains at a given output power
which may exceed the maximum design values of the input current. The UTC L8565 limits internally the current
drawn from the mains and therefore also limits the input power. The difference of input and output power will result in
decreasing output voltage. If the condition prolongs, the decreasing VOUT will terminate in output under voltage
condition (OUV, 50% of rated), and the IC will be shut down (See section 4.5).
Fig. 8 shows the occurrence of BOP in respect to the ISENSE voltage.
The VIN threshold for BOP to occur is dependent on the voltage at ISENSE and thus the output power. The rated
output power with a minimum VIN (VIN(MIN)) is
POUT
(rated)
=
VINMIN
×
0.6
R1×
2
Due to the internal parameter tolerance, the maximum power with VIN(MIN) before BOP occurs is
POUT
(max)
=
VINMIN
×
0.73
R1× 2
And the BOP takes over the normal operation under rated output power latest at an input voltage of
VBOPMAX
= POUT (rated)×
R1× 2
0.73
4.2 Soft Over Current Control (SOC)
The UTC L8565 is designed not to support any output power that corresponds to a voltage lower than -0.73V at
the ISENSE pin. A further increase in the inductor current, which results in a lower ISENSE voltage, will activate the Soft
Over Current Control (SOC). This is a soft control as it does not directly switch off the gate drive like the PCL. It acts
on the nonlinear gain block to result in a reduced PWM duty cycle.
4.3 Peak Current Limit (PCL)
The UTC L8565 is equipped with a cycle by cycle peak current protection feature. It is active when the voltage at
pin 5 (ISENSE) reaches -1.08V. This voltage is amplified by OP1 with a factor of -1.43 and connected to comparator
C2 with a reference voltage of 1.5V as shown in Fig. 9. A deglitcher with 300ns after the comparator improves noise
immunity to the activation of this protection.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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