ML4821CS Fairchild Optoelectronics Group, ML4821CS Datasheet - Page 2

• Manufacturer Part Number: ML4821CS
• Description: IC CONTROLLER PFC 5V 35MA 20SOIC
• Manufacturer: Fairchild Optoelectronics Group

Specifications of ML4821CS

• Mode: Average Current
• Frequency - Switching: 1MHz
• Current - Startup: 600µA
• Voltage - Supply: 12 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q1324911

ML4821
Pin Connection
Pin Description
2
18-Pin DIP
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
Pin Number
SOFT START
20-Pin SOIC
EA OUT
IA OUT
V
I
SINE
RMS
EA–
I
IA–
IA+
LIM
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
18-Pin PDIP (P18)
1
2
3
4
5
6
7
8
9
TOP VIEW
EA OUT Output of output voltage error amplifier
IA OUT Output and compensation node of the average current error amplifier
START
Name
SYNC
V
SOFT
V
I
PWR
GND
GND
OUT
OVP
V
I
SINE
INV
IA–
IA+
LIM
RMS
R
C
REF
CC
T
T
18
17
16
15
14
13
12
11
10
Peak cycle-by-cycle current limit input
Inverting input of the average current error amplifier
Non-Inverting input of the average current error amplifier and output of the
gain modulator
Gain modulator input
Inverting input to error amplifier
Input for average line voltage compensation
Normally connected to soft start capacitor
Oscillator synchronization input
Inhibits output pulses when the voltage at this pin exceeds 5V. Also,
when the voltage at this pin is less than 0.7V, the IC goes into low current
shut-down mode.
Timing resistor for the oscillator
Return for the high current totem pole output
High current totem pole output
Positive supply for the IC
Buffered output for the 5V voltage reference
Timing capacitor for the oscillator.
Analog signal ground
GND
C
V
V
OUT
PGND
R
OVP
SYNC
T
REF
CC
T
SOFT START
EA OUT
IA OUT
V
I
SINE
EA–
RMS
I
N/C
IA+
LIM
IA–
Function
20-Pin SOIC (S20)
10
1
2
3
4
5
6
7
8
9
TOP VIEW
20
19
18
17
16
15
14
13
12
11
PRODUCT SPECIFICATION
REV. 1.0.2 6/19/01
GND
C
V
V
OUT
PGND
R
OVP
SYNC
N/C
REF
CC
T
T