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ML4803
5
February 1999
FUNCTIONAL DESCRIPTION
The ML4803 consists of an average current mode boost
Power Factor Corrector (PFC) front end followed by a
synchronized Pulse W idth Modulation (PWM) controller. It
is distinguished from earlier combo controllers by its lo w
pin count, innov ati ve input current shaping technique, and
very low start-up and oper ating currents. T he PWM section
is dedicated to peak current mode operation. It uses
conventional tr ailing-edge modulation, w hile the PFC uses
leading-edge modulation. This patented Leading Edge/
Trailing Edge (LETE) modulation tec hnique helps to
minimize ripple current in the PFC DC buss capacitor.
T he ML4803 is offered in two versions. T he ML4803-1
operates both PFC and PWM sections at 67kHz, while the
ML4803-2 operates the PWM section at twice the
frequency (134kHz) of the PFC. This allows the use of
smaller PWM magnetics and output filter components,
while minimizing switching losses in the PFC stage.
In addition to power factor correction, sev eral protection
features hav e been built into the ML4803. T hese include
soft start, redundant PFC over-v oltage protection, peak
current limiting, duty cycle limit, and under voltage
lockout (UVLO). See Figure 12 for a typical application.
DETAILED PIN DESCRIPTIONS
VEAO
This pin provides the feedback path w hich forces the PFC
output to regulate at the programmed v alue. It connects to
programming resistors tied to the PFC output v oltage and
is shunted by the feedbac k compensation network.
ISENSE
This pin ties to a resistor or current sense transformer
which senses the PFC input current. This signal should be
negativ e with respect to the IC ground. It internally feeds
the pulse-by-pulse current limit comparator and the
current sense feedback signal. The ILIMIT trip level is –1V.
The ISENSE feedback is internally multiplied b y a gain of
four and compared against the internal programmed ramp
to set the PFC duty cycle. T he intersection of the boost
inductor current downslope with the internal
programming ramp determines the boost off-time.
VDC
This pin is typically tied to the feedback opto-collector. It
is tied to the internal 5V reference through a 26kW resistor
and to GND through a 40kW resistor.
ILIMIT
This pin is tied to the primary side PWM current sense
resistor or transformer. It pro vides the internal pulse-by
pulse-current limit for the PWM stage (which occurs at
1.5V) and the peak current mode feedback path for the
current mode control of the PWM stage. The current ramp
is offset internally by 1.2V and then compared against the
opto feedback voltage to set the PWM duty cycle.
PFC OUT and PWM OUT
PFC OUT and PWM OUT are the high-current power
drivers capable of directly driving the gate of a power
MOSFET with peak currents up to ±1A. Both outputs are
actively held low when VCC is below the UVLO threshold
level.
VCC
VCC is the power input connection to the IC. The V CC start-
up current is 150µA . The no-load ICC current is 2mA. VCC
quiescent current will include both the IC biasing currents
and the PFC and PWM output currents. Giv en the
operating frequency and the MOSFET gate charge (Qg),
average PFC and PWM output currents can be calculated
as IOUT = Qg x F. The average magnetizing current
required for any gate drive transformers must also be
included. The VCC pin is also assumed to be proportional
to the PFC output voltage. Internally it is tied to the
VCCOVP comparator (16.2V) providing redundant high-
speed over-voltage protection (OVP) of the PFC stage.
VCC also ties internally to the UVLO circuitry, enabling
the IC at 12V and disabling it at 9.1V. VCC must be
bypassed with a high quality ceramic bypass capacitor
placed as close as possible to the IC.
Good bypassing is critical to the proper operation of the
ML4803.
VCC is typically produced by an additional winding off
the boost inductor or PFC Choke, providing a voltage that
is proportional to the PFC output voltage. Since the
VCCOVP max voltage is 16.2V, an internal shunt limits
VCC overvoltage to an acceptable value. An external
clamp, such as shown in Figure 1, is desirable but not
necessary.
VCC is internally clamped to 16.7V minimum, 18.3V
maximum. This limits the maximum VCC that can be
applied to the IC while allowing a VCC which is high
Figure 1. Optional VCC Clamp
VCC
GND
1N4148
1N4148
1N5246B