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參數(shù)資料
| 型號： | ML4803IP-2 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 8-Pin PFC and PWM Controller Combo |
| 中文描述： | 8引腳PFC和PWM組合控制器 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大小： | 195K |
| 代理商： | ML4803IP-2 |
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
I
Internally synchronized PFC and PWM in one 8-pin IC
I
Patented one-pin voltage error amplifier with advanced
input current shaping technique
I
Peak or average current, continuous boost, leading
edge PFC (Input Current Shaping Technology)
I
High efficiency trailing-edge current mode PWM
I
Low supply currents; start-up: 150μA typ., operating:
2mA typ.
I
Synchronized leading and trailing edge modulation
I
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
I
Overvoltage, UVLO, and brownout protection
I
PFC V
CC
OVP 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
COMP
PFC OFF
ONE PIN ERROR AMPLIFIER
LEADING
EDGE PFC
TRAILING
EDGE PWM
+
–
7V
+
COMP
–
–1
–4
REF
VCC
7
PFC
CONTROL
LOGIC
相關PDF資料 |
PDF描述 |
|---|---|
| ML4803CP-1 | 8-Pin PFC and PWM Controller Combo |
| ML4803CP-2 | 8-Pin PFC and PWM Controller Combo |
| ML4803CP-1 | 8-Pin PFC and PWM Controller Combo |
| ML4803IP-2 | 8-Pin PFC and PWM Controller Combo |
| ML4803IP-1 | 8-Pin PFC and PWM Controller Combo |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ML4803IS-1 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:8-Pin PFC and PWM Controller Combo |
| ML4803IS-2 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:8-Pin PFC and PWM Controller Combo |
| ML4803IX-X | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-Pin PFC and PWM Controller Combo |
| ML4804 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo |
| ML4804CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor Correction and PWM Controller Combo |
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