ML4800CSX_NL

Manufacturer Part NumberML4800CSX_NL
DescriptionIC CTLR PFC/PWM 16-SOIC
ManufacturerFairchild Semiconductor
ML4800CSX_NL datasheet
 


Specifications of ML4800CSX_NL

ModeAverage CurrentFrequency - Switching76kHz
Current - Startup200µAVoltage - Supply11 V ~ 16.5 V
Operating Temperature0°C ~ 70°CMounting TypeSurface Mount
Package / Case16-SOIC (3.9mm Width)Switching Frequency81 KHz
Maximum Operating Temperature+ 70 CMounting StyleSMD/SMT
Minimum Operating Temperature0 CLead Free Status / RoHS StatusLead free / RoHS Compliant
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ML4800
Power Factor Correction and PWM Controller
Combo
Features
Block Diagram
16
VEAO
V FB
VEA
15
-
IEA
1.6k
+
2.5V
+
I AC
-
2
GAIN
V RMS
MODULATOR
4
1.6k
I SENSE
3
RAMP 1
7
RAMP 2
8
-
V DC
1.25V
6
+
V CC
25 A
SS
5
DC I LIMIT
V REF
9
General Description
1
POWER FACTOR CORRECTOR
IEAO
TRI-FAULT
OVP
0.5V
+
+
-
2.75V
-
+
-
-1V
+
-
PFC I LIMIT
OSCILLATOR
DUTY CYCLE
LIMIT
-
V IN OK
V FB
-
+
1.0V
-
2.45V
+
+
DC I LIMIT
PULSE WIDTH MODULATOR
www.fairchildsemi.com
13
V CC
V CC
V REF
17V
7.5V
14
REFERENCE
S
Q
R
Q
PFC OUT
S
Q
12
R
Q
PWM OUT
S
Q
11
R
Q
V CC
UVLO
REV. 1.0.5 9/25/01

ML4800CSX_NL Summary of contents

  • Page 1

    ML4800 Power Factor Correction and PWM Controller Combo Features Block Diagram 16 VEAO V FB VEA 15 - IEA 1. GAIN V RMS MODULATOR 4 1.6k I SENSE 3 RAMP 1 7 RAMP ...

  • Page 2

    ML4800 Pin Configuration Pin Description Pin Name 1 IEAO Slew rate enhanced PFC transconductance error amplifier output 2 I PFC AC line reference input to Gain Modulator Current sense input to the PFC Gain Modulator SENSE 4 ...

  • Page 3

    PRODUCT SPECIFICATION Abolute Maximum Ratings Parameter Voltage SENSE Voltage on Any Other Pin I REF I Input Current AC Peak PFC OUT Current, Source or Sink Peak PWM OUT Current, Source or Sink PFC OUT, PWM OUT ...

  • Page 4

    ML4800 Electrical Characteristics Unless otherwise specified 15V Symbol Parameter Input Bias Current Output High Voltage Output Low Voltage Source Current Sink Current Open Loop Gain Power Supply Rejection Ratio OVP Comparator Threshold Voltage Hysteresis Tri-Fault Detect ...

  • Page 5

    PRODUCT SPECIFICATION Electrical Characteristics Unless otherwise specified 15V Symbol Parameter PFC Dead Time C Discharge Current T Reference Output Voltage Line Regulation Load Regulation Temperature Stability Total Variation Long Term Stability PFC Minimum Duty Cycle Maximum ...

  • Page 6

    ML4800 Typical Performance Characteristics Voltage Error Amplifier (VEA) Transconductance (g 180 160 140 120 100 –500 0 IEA INPUT VOLTAGE (mV) Current Error Amplifier (IEA) Transconductance (g 6 180 160 140 120 100 80 60 ...

  • Page 7

    PRODUCT SPECIFICATION Functional Description Power Factor Correction REV. 1.0.5 9/25/01 PFC Section Gain Modulator 1. A current representing the instantaneous input voltage (amplitude and waveshape) to the PFC. The rectified AC input sine wave is converted to a proportional current ...

  • Page 8

    ML4800 Current Error Amplier 16 VEAO V FB VEA IEA 15 – 1. – 2 GAIN V RMS MODULATOR 4 1.6k I SENSE 3 RAMP Cycle-By-Cycle Current Limiter TriFault Detect Overvoltage Protection ...

  • Page 9

    PRODUCT SPECIFICATION Error Amplier Compensation PFC OUTPUT 16 VEAO V FB VEA 15 – 2. GAIN V RMS MODULATOR 4 I SENSE 3 Figure 2. Compensation Network Connections for the Voltage and Current Error Amplifiers REV. ...

  • Page 10

    ML4800 Oscillator (RAMP 1) PWM SECTION Pulse Width Modulator 10 PRODUCT SPECIFICATION PWM Current Limit V OK Comparator IN PWM Control (RAMP 2) Soft Start REV. 1.0.5 9/25/01 ...

  • Page 11

    PRODUCT SPECIFICATION Generating VIN DC REF – RAMP OSC CLK U4 Figure 4. Typical Trailing Edge Control Scheme REV. 1.0.5 9/25/01 SW2 SW1 C1 RAMP VEAO DFF + ...

  • Page 12

    ML4800 Leading/Trailing Modulation VIN – REF RAMP OSC CLK U4 Figure 5. Typical Leading Edge Control Scheme 12 Typical Applications SW2 SW1 C1 RAMP VEAO DFF CMP + VSW1 ...

  • Page 13

    PRODUCT SPECIFICATION Figure 6. 100W Power Factor Corrected Power Supply, Designed Using Micro Linear Application Note 33 REV. 1.0.5 9/25/01 ML4800 13 ...

  • Page 14

    ... ML4800IP ML4800IS DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...