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ML4803IP-1 Folha de dados(PDF) 1 Page - Micro Linear Corporation

Nome de Peças ML4803IP-1
Descrição Electrónicos  8-Pin PFC and PWM Controller Combo
Download  13 Pages
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Fabricante Electrônico  MICRO-LINEAR [Micro Linear Corporation]
Página de início  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4803IP-1 Folha de dados(HTML) 1 Page - Micro Linear Corporation

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February 1999
PRELIMINARY
ML4803
8-Pin PFC and PWM Controller Combo
1
BLOCK DIAGRAM
GENERAL DESCRIPTION
The ML4803 is a space-saving controller for power factor
corrected, switched mode power supplies that offers very
low start-up and operating currents.
Power Factor Correction (PFC) offers the use of smaller,
lower cost bulk capacitors, reduces power line loading
and stress on the switching FETs, and results in a power
supply fully compliant to IEC1000-3-2 specifications. The
ML4803 includes circuits for the implementation of a
leading edge, average current “boost” type PFC and a
trailing edge, PWM.
The ML4803-1’s PFC and PWM operate at the same
frequency, 67kHz. The PFC frequency of the ML4803-2 is
automatically set at half that of the 134kHz PWM. This
higher frequency allows the user to design with smaller
PWM components while maintaining the optimum
operating frequency for the PFC. An overvoltage
comparator shuts down the PFC section in the event of a
sudden decrease in load. The PFC section also includes
peak current limiting for enhanced system reliability.
FEATURES
s
Internally synchronized PFC and PWM in one 8-pin IC
s
Patented one-pin voltage error amplifier with advanced
input current shaping technique
s
Peak or average current, continuous boost, leading
edge PFC (Input Current Shaping Technology)
s
High efficiency trailing-edge current mode PWM
s
Low supply currents; start-up: 150µA typ., operating:
2mA typ.
s
Synchronized leading and trailing edge modulation
s
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
s
Overvoltage, UVLO, and brownout protection
s
PFC VCCOVP with PFC Soft Start
ISENSE
3
VEAO
4
VDC
5
ILIMIT
6
GND
2
PWM OUT
8
PFC OUT
1
+
+
COMP
COMP
35µA
16.2V
17.5V
VCC
+
COMP
+
–1V
SOFT START
PFC/PWM UVLO
DUTY CYCLE
LIMIT
OSCILLATOR
PFC – 67kHz
PWM – 134kHz
VREF
VREF
1.2V
26k
40k
M1
R1
C1
30pF
M2
M7
M3
M4
M6
PWM
CONTROL
LOGIC
+
1.5V
DC ILIMIT
PFC ILIMIT
PWM COMPARATOR
VCC OVP
PFC OFF
ONE PIN ERROR AMPLIFIER
LEADING
EDGE PFC
TRAILING
EDGE PWM
+
COMP
7V
+
COMP
–1
–4
REF
VCC
7
PFC
CONTROL
LOGIC


Nº de peça semelhante - ML4803IP-1

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