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PDF ML4822 Data sheet ( Hoja de datos )
| Número de pieza | ML4822 | |
| Descripción | ZVS Average Current PFC Controller | |
| Fabricantes | Micro Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ML4822 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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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.
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
*This Part Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM (Pin configuration shown for 14-pin package)
FB
14
1
VEAO
– VEA
8
GND
2.5V
+
R+
IAC
4
VRMS
5
ISENSE
3
GAIN
MODULATOR
R–
IEA
+
–
2
IEAO
+
–
RTCT
6
REF
13
VCCZ
REF
OSC
ZV SENSE
7
+
––
FB
2.7V
OVP
+
–
I LIMIT
–1V +
–
VCCZ
13.5V
VCC
12
SQ
R
SQ
RQ
SQ
RQ
PFC OUT
11
ZVS OUT
10
PWR GND
9
1
1 page  
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
CONDITIONS
MOSFET DRIVER OUTPUTS
Output Low Voltage
Output High Voltage
Output Rise/Fall Time
IOUT = –20mA
IOUT = –100mA
IOUT = –10mA, VCC = 8V
IOUT = 20mA
IOUT = 100mA
CL = 1000pF
UNDERVOLTAGE LOCKOUT
Threshold Voltage
Hysteresis
SUPPLY
Shunt Voltage (VCCZ)
Load Regulation
Total Variation
ICC =25mA
25mA < ICC < 55mA
Load and temperature
Start-up Current
Operating Current
VCC < 12.3V
VCC = VCCZ – 0.5V
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
Note 2: Gain = K x 5.3 V; K = (IGAINMOD – IOFFSET) x IAC x (VEAO – 1.5)–1.
ML4822
MIN
TYP
MAX
UNITS
0.3 0.8
0.6 3.0
0.8 1.5
9.5 10.3
9 10.3
40
V
V
V
V
V
ns
VCCZ – 0.9 VCCZ – 0.6 VCCZ – 0.2
2.5 2.8 3.2
V
V
12.8 13.5 14.2
±150
±300
12.4 14.6
0.7 1.1
22 28
V
mV
V
mA
mA
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ML4822.PDF ] | |
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