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參數(shù)資料
| 型號： | ML4827CP-1 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fault-Protected PFC and PWM Controller Combo |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 256K |
| 代理商： | ML4827CP-1 |
November 1998
PRELIMINARY
ML4827
*
Fault-Protected PFC and PWM Controller Combo
1
GENERAL DESCRIPTION
The ML4827 is a controller for power factor corrected,
switched mode power supplies, that includes circuitry
necessary for conformance to the safety requirements of
UL1950. A direct descendent of the industry-standard
ML4824-1, the ML4827 adds a TriFault Detect function
to guarantee that no unsafe conditions may result from
single component failure in the PFC. Power Factor
Correction (PFC) allows the use of smaller, lower cost
bulk capacitors, reduces power line loading and stress on
the switching FETs, and results in a power supply that
fully complies with IEC1000-3-2 specification. The
ML4827 includes circuits for the implementation of a
leading edge, average current, “boost” type power factor
correction and a trailing edge, pulse width modulator
(PWM). The device is available in two versions; the
ML4827-1 (Duty Cycle
MAX
= 50%) and the ML4827-2
(Duty Cycle
MAX
= 74%). The higher maximum duty cycle
of the -2 allows enhanced utilization of a given
transformer core’s power handling capacity. An over-
voltage comparator shuts down the PFC section in the
event of a sudden decrease in load. The PFC section also
includes peak current limiting and input voltage brown-
out protection. The PWM section can be operated in
current or voltage mode, and includes a duty cycle limit
to prevent transformer saturation.
FEATURES
I
Pin-compatible with industry-standard ML4824-1
I
TriFault Detect to conform to UL1950 requirements
I
Available in 50% or 74% max duty cycle versions
I
Low total harmonic distortion
I
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
I
Average current, continuous boost leading edge PFC
I
High efficiency trailing-edge PWM can be configured
for current mode or voltage mode operation
I
Average line voltage compensation with brown-out
control
I
PFC overvoltage comparator eliminates output
“runaway” due to load removal
I
Current fed gain modulator for improved noise immunity
I
Overvoltage protection, UVLO, and soft start
BLOCK DIAGRAM
* Some Packages Are End Of Life
16
1
VEAO
IEAO
VFB
IAC
VRMS
ISENSE
RAMP 1
OSCILLATOR
OVP
PFC ILIMIT
UVLO
VREF
PULSE WIDTH MODULATOR
POWER FACTOR CORRECTOR
BROKEN WIRE
COMPARATOR
2.5V
+
–
–
+
7.5V
REFERENCE
VCC
VCCZ
VREF
VEA
+
–
IEA
+
–
+
–
+
–
PFC OUT
S
R
Q
Q
S
R
Q
Q
2.7V
–1V
0.5V
2μA
RAMP 2
PWM OUT
S
R
Q
Q
VDC
SS
DC ILIMIT
VCC
DUTY CYCLE
LIMIT
–
+
1V
–
+
2.5V
VFB
–
+
8V
8V
VIN OK
GAIN
MODULATOR
VCCZ
3.5k
3.5k
1.25V
50μA
–
+
13.5V
DC ILIMIT
14
12
11
GND
10
15
2
4
3
7
8
6
5
9
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4827CP-2 | Fault-Protected PFC and PWM Controller Combo |
| ML4827IS-2 | Fault-Protected PFC and PWM Controller Combo |
| ML4827IP-2 | Fault-Protected PFC and PWM Controller Combo |
| ML4827CS-2 | Fault-Protected PFC and PWM Controller Combo |
| ML4827CS-1 | Fault-Protected PFC and PWM Controller Combo |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4827CP2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4827CP-2 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Fault-Protected PFC and PWM Controller Combo |
| ML4827CS1 | 功能描述:功率因數(shù)校正 IC SOIC-WIDE-16 RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| ML4827CS-1 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Fault-Protected PFC and PWM Controller Combo |
| ML4827CS-2 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Fault-Protected PFC and PWM Controller Combo |
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