Document
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 ▼ TDA 4862 ▼ TDA 4862 G
▼ = New type
Ordering Code Q67000-A8368 Q67006-A8369
TDA 4862
Bipolar IC
PG-DIP-8-1
PG-DSO-8-1 Package PG-DIP-8-1 PG-DSO-8-1
1 2005-02-17
TDA 4862
Description
The TDA 4862 is excellent convenient for designing a preconverter in ballasts and switched mode power supplies with sinusoidal line current consumption and a power factor approaching unity.
The TDA 4862 controls a boost converter as an active harmonics filter in a discontinuous mode (free oscillating triangular shaped current mode).
The TDA 4862 comprises an internal start-up timer, a high gain voltage amplifier, an one quadrant multiplier for approaching unity power factor, a zero current detector, PWM and logic circuitry, and totem pole MOSFET gate driver.
Protective features are: input undervoltage lockout with hysteresis, VCC zener clamp,
cycle-by-cycle current limiting, output voltage limiting for fast and slow load changes up to open circuit, and a sinking gate driver current activated whenever undervoltage mode occurs.
The output voltage of this preconverter is regulated with high accuracy. Therefore the device can be used for world-wide line voltages without switches.
The TDA 4862 is the improved version of the TDA 4817 with a pinout equivalent to world standard.
TDA 4862 G
TDA 4862
VSENSE VAOUT MULTIN
Ι SENSE
1 2 3 4
8 7 6 5
IEP01748
VCC GTDRV GND DETIN
VSENSE VAOUT MULTIN Ι SENSE
1 2 3 4
8 VCC 7 GTDRV 6 GND 5 DETIN
IEP01749
Figure 1 Pin Configuration (top view)
2 2005-02-17
TDA 4862
Pin Definitions and Functions
Pin Symbol Function
1 VSENSE Voltage Amplifier Inverting Input; VSENSE is connected via a resistive divider to the boost converter output. With a capacitor connected to VAOUT it forms an integrator.
2 VAOUT
Voltage Amplifier Output;
VAOUT is connected internally to the first multiplier input. To prevent
overshoot the input voltage will be clamped at 5 V. During no load
conditions output pulses are suppressed completely whenVAOUT falls
below 2.2 V.
If the current flowing into this pin is exceeding an internal defined margin
the multiplier output voltage is reduced to prevent the MOSFET from
overvoltage damage.
3 MULTIN Multiplier Input; MULTIN is the second multiplier input and connected via a resistive divider to the rectifier output voltage.
I4 SENSE
Current Sense Minus;
ISENSE is connected to a sense resis.