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PDF R2A20111DD Data sheet ( Hoja de datos )
| Número de pieza | R2A20111DD | |
| Descripción | Power Factor Correction Controller IC | |
| Fabricantes | Renesas Technology | |
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R2A20111SP/DD
Power Factor Correction Controller IC
REJ03F0231-0100
Rev.1.00
Mar 28, 2007
Description
The R2A20111 is a power-factor correction (PFC) controller IC.
This IC adopts continuous conduction mode as PFC operation.
Various functions such as constant power limit, overvoltage detection, overcurrent detection, soft start, feedback-loop
disconnection detection, and holding function of PFC operation through momentary outage (PFC hold function) are
incorporated in a single chip. These functions reduce external circuitry.
The constant power limit function allows to eliminate a significant amount of coil noise which is generated due to
overcurrent detection operation in case of conventional overload.
The PFC hold function enables quick recovery by continuing PFC operation after momentary outage. The hold time
can be adjusted by an external capacitance.
Overcurrent detection pin is separately provided.
Latch mode shutdown function is incorporated.
A soft-start control pin provides for the easy adjustment of soft-start operation, and can be used to prevent overshooting
of the output voltage.
Features
• Maximum ratings
⎯ Power-supply voltage Vcc: 24 V
⎯ Operating junction temperature Tjopr: – 40 to 125°C
• Electrical characteristics
⎯ VREF output voltage VREF: 5.0 V ± 3%
⎯ UVLO operation start voltage VH: 10.5 ± 0.9 V
⎯ UVLO operation stop voltage VL: 9.0 ± 0.7 V
⎯ PFC output maximum ON duty Dmax-out: 95% (typ.)
• Functions
⎯ Constant power limit function
⎯ Continuous conduction mode
⎯ Hold function of PFC operation on momentary outage (PFC hold function)
⎯ Overvoltage detection
⎯ Overcurrent detection
⎯ Soft start
⎯ Feedback loop disconnection detection
⎯ IC shutdown function
⎯ Package lineup: SOP-16 and DILP-16
Applications
• Flat panel display
• Projector
• Desktop PC
• White goods
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 1 of 40
1 page  
R2A20111SP/DD
EO Pin:
This pin is the output of the voltage amplifier. This pin is connected to the phase-compensation circuit of the voltage
amplifier.
SS Pin:
This pin is connected to GND or VREF via a capacitor. This pin is pulled up to the voltage on the VREF pin until PFC
operation starts. When the voltage on the PFC-ON pin has reached 0.82 V (typ.), PFC operation starts and this pin
flows 25 μA source current. Operation of the CAO pin is affected by that of the SS pin, the pulse width of the OUT pin
is limited, and this prevents overshooting when start up.
VCC Pin:
This pin is for the IC power supply. The IC starts up at 10.5 V (typ.), and stops at 9 V (typ.).
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 5 of 40
5 Page 
R2A20111SP/DD
2. Stop Timing by PFC-ON Pin
PFC-ON
DELAY
PFC-OFF
(Internal signal)
SS
0.79V
(Voff-pfc)
1.2V(Vd-pfc)
td-pfcoff
PFC hold time
OUT
FB
Normal control
REJ03F0231-0100 Rev.1.00 Mar 28, 2007
Page 11 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet R2A20111DD.PDF ] | |
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