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PDF ML4805CP Data sheet ( Hoja de datos )
| Número de pieza | ML4805CP | |
| Descripción | Variable Feedforward PFC/PWM Controller Combo | |
| Fabricantes | Micro Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ML4805CP (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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November 1998
PRELIMINARY
ML4805
Variable Feedforward PFC/PWM Controller Combo
GENERAL DESCRIPTION
FEATURES
The ML4805 is a controller for power factor corrected,
switched mode power supplies. Similar to the ML4801,
the ML4805 may be used for voltage mode operation. Key
features of this combined PFC and PWM controller are
low start-up and operating currents. 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 IEC1000-2-3 specifications. The
ML4805 includes circuits for the implementation of a
leading edge, average current “boost” type power factor
correction and a trailing edge pulse width modulator.
The PFC frequency of the ML4805 is automatically set at
half that of the PWM frequency generated by the internal
oscillator. This technique allows the user to design with
smaller output components while maintaining the
optimum operating frequency for the PFC. 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.
s Internally synchronized PFC and PWM in one IC
s Low start-up current (200µA typ.)
s Low operating current (5.5mA typ.)
s Low total harmonic distortion
s Reduces ripple current in the storage capacitor
between the PFC and PWM sections
s Average current continuous boost leading edge PFC
s High efficiency trailing edge PWM optimized for
voltage mode operation
s Current fed gain modulator for improved noise
immunity
s Brown-out control, overvoltage protection, UVLO, and
soft start
BLOCK DIAGRAM
18
VEAO
1
IEAO
POWER FACTOR CORRECTOR
VFB
17
2.5V
IAC
2
VRMS
4
ISENSE
3
RAMP 1
8
RTCT
7
VEA
-
+
1.6kΩ IEA
+
–
GAIN
MODULATOR
1.6kΩ
+
-
OSCILLATOR
÷2
2.75V
OVP
+
-
-1V +
-
PFC ILIMIT
RAMP 2
9
8V
VDC
6
VCC
SS
5
25µA
AGND
11
8V
1.25V
-
+
-
+
DUTY CYCLE
LIMIT
VFB
2.5V
VIN OK
-
+
1.5V
+
-
DC ILIMIT
PULSE WIDTH MODULATOR
VCC
VCC
15
VCC
7.5V
REFERENCE
VREF
16
SQ
RQ
SQ
PFC OUT
14
RQ
PGND
12
SQ
RQ
UVLO
PWM OUT
13
ILIM
10
1
1 page  
ELECTRICAL CHARACTERISTICS (Continued)
SYMBOL
PARAMETER
REFERENCE
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Variation
Long Term Stability
PFC
Minimum Duty Cycle
Maximum Duty Cycle
Output Low Voltage
Output High Voltage
PWM
DC
VOL
Rise/Fall Time
Duty Cycle Range
Output Low Voltage
VOH Output High Voltage
SUPPLY
Rise/Fall Time
Start-up Current
Operating Current
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
CONDITIONS
TA = 25ºC, I(VREF) = 1mA
11V < VCC < 16.5V
1mA < I(VREF) < 10mA
Line, Load, Temp
TJ = 125ºC, 1000 Hours
VIEAO > 6.7V
VIEAO < 1.2V
IOUT = -20mA
IOUT = -100mA
IOUT = -10mA, VCC = 9V
IOUT = 20mA
IOUT = 100mA
CL = 1000pF
IOUT = -20mA
IOUT = -100mA
IOUT = -10mA, VCC = 9V
IOUT = 20mA
IOUT = 100mA
CL = 1000pF
VCC = 12V, CL = 0
VCC = 14V, CL = 0
Note 1:
Note 2:
Note 3:
Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
Includes all bias currents to other circuits connected to the VFB pin.
Gain = K x 5.3V; K = (IMULO - IOFFSET) x IAC x (VEAO - 0.625V)-1.
ML4805
MIN TYP MAX UNITS
7.4 7.5 7.6 V
10 25 mV
10 20 mV
0.4 %
7.35
7.65
V
5 25 mV
0%
90 95
%
0.4 0.8 V
0.7 2.0 V
0.4 0.8 V
VCC - 0.8
V
VCC - 2.0
V
50 ns
0-44
VCC - 0. 8
VCC - 2.0
0-47
0.4
0.7
0.4
50
0-50
0.8
2.0
0.8
%
V
V
V
V
V
ns
12.4
2.7
200
5.5
13.0
3.0
350
7.0
13.6
3.3
µA
mA
V
V
5
5 Page 
160
0
–160
01234
VFB (V)
Figure 5. IVEAO vs. VFB
5
ML4805
180
90
0
01234
VFB (V)
Figure 6. gM of VOTA
5
200
160
120
80
40
0
01234
VFB (V)
Figure 7. gM of IOTA
5
500
0
01234
VFB (V)
Figure 8. K of Multiplier
5
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ML4805CP.PDF ] | |
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