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ML4822IS 数据表(PDF) 1 Page - Micro Linear Corporation

部件名 ML4822IS
功能描述  ZVS Average Current PFC Controller
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制造商  MICRO-LINEAR [Micro Linear Corporation]
网页  http://www.microlinear.com
标志 MICRO-LINEAR - Micro Linear Corporation

ML4822IS 数据表(HTML) 1 Page - Micro Linear Corporation

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1
May 1997
ML4822
*
ZVS Average Current PFC Controller
GENERAL DESCRIPTION
The ML4822 is a PFC controller designed specifically for
high power applications. The controller contains all of the
functions necessary to implement an average current
boost PFC converter, along with a Zero Voltage Switch
(ZVS) controller to reduce diode recovery and MOSFET
turn-on losses.
The average current boost PFC circuit provides high
power factor (>98%) and low Total Harmonic Distortion
(THD). Built-in safety features include undervoltage
lockout, overvoltage protection, peak current limiting, and
input voltage brownout protection.
The ZVS control section drives an external ZVS MOSFET
which, combined with a diode and inductor, soft switches
the boost regulator. This technique reduces diode reverse
recovery and MOSFET switching losses to reduce EMI and
maximize efficiency.
*This Part Is End Of Life As Of August 1, 2000
FEATURES
s
Average current sensing, continuous boost, leading
edge PFC for low total harmonic distortion and near
unity power factor
s
Built-in ZVS switch control with fast response for high
efficiency at high power levels
s
Average line voltage compensation with brownout
control
s
Current fed gain modulator improves noise immunity
and provides universal input operation
s
Overvoltage comparator eliminates output “runaway”
due to load removal
s
UVLO, current limit, and soft-start
s
Precision 1% reference
BLOCK DIAGRAM (Pin configuration shown for 14-pin package)
Q
S
R
+
1
14
VEAO
VEA
2.5V
FB
4
IAC
5
VRMS
+
3
ISENSE
8
GND
2
IEAO
+
IEA
R+
R–
+
6
RTCT
OSC
GAIN
MODULATOR
S
R
Q
+
2.7V
FB
–1V
12
VCC
VCCZ
13.5V
ZVS OUT
11
Q
S
R
Q
PFC OUT
9
PWR GND
10
OVP
I LIMIT
REF
13
ZV SENSE
7
+
VCCZ
REF
Q


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