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PDF TDA4862 Data sheet ( Hoja de datos )

Número de pieza TDA4862
Descripción Power-Factor Controller PFC IC for High Power Factor and Active Harmonic Filter
Fabricantes Siemens Semiconductor 
Logotipo Siemens Semiconductor Logotipo



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Power-Factor Controller (PFC)
IC for High Power Factor
and Active Harmonic Filter
Advanced Information
Features
• IC for sinusoidal line-current consumption
• Power factor approaching 1
• Controls boost converter as an active
harmonics filter
• Internal start-up with low current consumption
• Zero current detector for discontinuous
operation mode
• High current totem pole gate driver
• Trimmed ± 1.4% internal reference
• Undervoltage lock-out with hysteresis
• Very low start-up current consumption
• Pin compatible to world standard
• Fast overvoltage regulator
• Current sense input with internal low pass filter
Type
w TDA 4862
w TDA 4862 G
w = New type
Ordering Code
Q67000-A8368-A205
Q67006-A8369-A703
TDA 4862
Bipolar IC
P-DIP-8-1
P-DSO-8-1
Package
P-DIP-8-1
P-DSO-8-1
Semiconductor Group
1
1998-02-16

1 page




TDA4862 pdf
TDA 4862
Functional Description (cont’d)
MuItiplier
A one quadrant multiplier is the crucial circuitry that regulates the gate driver with respect
of the DC output voltage and the AC haversine input voltage of the preregulator. Both
inputs are designed for good linearity over a wide dynamic range, 0 V to 4.0 V for the
MULTIN and 2.5 V to 4.0 V for the VAOUT.
Current Sense Comparator and RS Latch
The multiplier output voltage is compared with the current sense voltage which
represents the current through the MOSFET. The current sense comparator in addition
with the logic ensures that only a single pulse appears at the drive output during a
given cycle. The multiplier output and the current sense threshold are internally clamped
at 1.3 V. So the gate drive MOSFET is protected against critical operating, as they occur
during start up. To prevent the input from negative pulses a special protection circuitry
is implemented. Switch-on current peaks are reduced by an internal RC-Filter.
Zero Current Detector
The zero current detector senses the inductor current via an auxiliary winding and
ensures that the next on-time is initiated immediately when the inductor current has
reached zero. This diminishes the reverse recovery losses of the boost converter diode.
Output switch conduction is terminated when the voltage drop of the shunt resistor
reaches the threshold level of the multiplier output. So the boost current waveform has
a triangular shape and there are no deadtime gaps between the cycles. This leads to a
continuous AC line current limiting the peak current to twice of the average current.
To prevent false tripping the zero current detector is designed as a Schmitt trigger with
a hysteresis of 0.6 V. An internal 5 V clamp protects the input from overvoltage
breakdown, a 0.6 V clamp prevents substrate injection. An external resistor must be
used in series with the auxiliary winding to limit the current through the clamps.
Timer
A restart timer function was added to the IC to eliminate the need for an oscillator when
used in stand-alone applications. The timer starts or restarts the TDA 4862 if the drive
output has been off for more than 15 µs after the inductor current reaches zero.
Semiconductor Group
5
1998-02-16

5 Page





TDA4862 arduino
TDA 4862
Electrical Characteristics (cont’d)
Unless otherwise stated, VCC = 12 V, – 40 °C < Tj < 150 °C.
Parameter
Symbol
Limit Values
Unit Test Condition
min. typ.
max.
Output voltage swing
high state
Output voltage swing
low state
VVAOUTH 3.8
V VAOUTL
4.3
0.9
5.0 V
–V
IVAOUT = – 0.2 mA
VVSENSE = 2.3 V
IVAOUT = 0.5 A
VVSENSE = 2.8 V
Overvoltage Regulator
Regulation current
IRVAOUT 20
30
45
µA
V V=VAOUT
MULTIN
= 4 V,
VISENSE = 0.5 V
Current Comparator
Input bias current
Input offset voltage
IBISENSE
VISENSEO
–1
25
Max threshold voltage
Delay to output1)
VISENSEM 1.05
tPHL
1.25
250
µA –
– mV VMULTIN = 0 V,
VVAOUT = 2.4 V
1.5 V –
– ns –
Detector
Upper threshold voltage
V( DETIN increasing)
Lower threshold voltage
V( DETIN decreasing)
Hysteresis
Input current
VDETINU
VDETINL
VDETINHY
IBDETIN
1.5
–1
2.5
1.9
0.6
Input clamp voltage
High state
Low state
VDETINHC
VDETINLC
4
5
0.6
1) Guaranteed by design, not 100 % tested in production.
2.75 V –
– V–
– V–
µA 1.5 V < VDETIN
< 2.75 V
– V IDETIN = 5 mA
1 V IDETIN = – 5 mA
Semiconductor Group
11
1998-02-16

11 Page







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