ml4821 Fairchild Semiconductor, ml4821 Datasheet

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ml4821

Manufacturer Part Number
ml4821
Description
Power Factor Correction Pfc Controller
Manufacturer
Fairchild Semiconductor
Datasheet

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Features
Block Diagram
ML4821
Power Factor Controller
11
1
2
3
4
5
8
6
7
9
OVP
I
IA OUT
IA–
IA+
I
V
EA OUT
EA–
SOFT START
LIM
SINE
RMS
V
REF
+
+
MODULATOR
+
GAIN
OUT
V
REF
+
+
V
REF
0.7V
General Description
+
R
S
OSC
Q
SLEEP
V
17V
VOLTAGE
LOCKOUT
LIMIT
UNDER
www.fairchildsemi.com
REV. 1.0.2 6/19/01
PGND
SYNC
V
GND
OUT
V
REF
CC
R
C
T
T
16
18
15
14
13
12
10
17

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ml4821 Summary of contents

Page 1

... ML4821 Power Factor Controller Features Block Diagram OVP LIM 1 – OUT 2 IA– 3 – SINE OUT 5 GAIN V RMS MODULATOR 8 EA OUT 6 EA– 7 – REF SOFT START 9 General Description + – + REF SLEEP 0.7V – – OSC V REF www.fairchildsemi.com V REF ...

Page 2

... ML4821 Pin Connection 18-Pin PDIP (P18 LIM IA OUT 2 IA– SINE EA OUT 6 EA– RMS SOFT START 9 TOP VIEW Pin Description Pin Number 18-Pin DIP 20-Pin SOIC Name LIM OUT Output and compensation node of the average current error amplifier ...

Page 3

... Open 25° 1mA A O 12V < V < 24V CC 1mA < I < 20mA O line, load, temp 10Hz to 10kHz T = 125°C, 1000 hrs REF ML4821 Min Max Units µJ 1 GND –0.3V 5.5 V 150 °C –65 150 °C 260 ° ...

Page 4

... ML4821 Electrical Characteristics = 6.2k Ω Unless otherwise specified Parameter Voltage Error Amplifier Input Offset Voltage Input Bias Current Open Loop Gain PSRR Output Sink Current Output Source Current Output High Voltage Output Low Voltage Unity Gain Bandwidth Soft Start Charge Current Current Error Amplifi ...

Page 5

... OUT I = 200mA OUT I = –20mA OUT I = –200mA OUT I = –5mA OUT 1000pF L Start-up 14V 25° Operating 25° 35mA CC I OUTIA+ I INEAOUT ML4821 = 15V (Notes 1 & 2). CC Min. Typ. Max. Units 0.1 0.4 V 1 13.4 V 0.1 0 14.5 16.5 V 8.5 11.0 V 4.4 V 0.6 1.2 mA ...

Page 6

... ML4821 Functional Description Oscillator OSC RAMP DISCHARGE T = C(Ramp Valley to Peak) ÷ (I RAMP T = C(Ramp Valley to Pk) ÷ (8.4mA – I DISCHARGE CLOCK t D RAMP PEAK C T RAMP VALLEY 8.4mA Q1 SYNC 2kΩ 1kΩ Figure 1. Oscillator Block Diagram 6 VOLTAGE and Current ERROR Amplifiers ...

Page 7

... OPERATING BOUNDRY DESIGN FOR NORMAL OPERATIONS THIS IS THE MINIMUM OPERATING VOLTAGE POINT 0.23 THIS GAIN CURVE TAKES 2 OUT THE 1/( DEPENDENCY OF THE VOLTAGE CONTROL LOOP 85VAC 220VAC 120VAC V RMS the voltage RMS ML4821 0 – 120 150 180 10M 7 7 ...

Page 8

... ML4821 Under Voltage Lockout, OVP and Current Limit 500 R = 5kΩ RMS 400 300 200 100 0 0 100 200 300 SINE INPUT CURRENT (µA) Figure 7. Gain Modulator Linearity SUPPLY VOLTAGE (V) CC Figure 9. Total Supply Current vs. Supply Voltage. ...

Page 9

... PRODUCT SPECIFICATION Off-line Start-up and Bias Supply Generation R10 39kΩ 1µ 1µ OUT ≈ N 14V S Figure 11. Bias and Start-up Circuit. REV. 1.0.2 6/19/ PIN 15 1000µF ML4821 9 ...

Page 10

... D6 R1 1N5406 0.25Ω 1N5406 L1 C12 D7 1µF 1N4934 C14 470µF C13 1µF R10 39kΩ D8 1N4934 R7 R11 560kΩ 8.2kΩ ML4821 7.3Ω LIM GND OUT IA– V REF SINE OUT 91kΩ ...

Page 11

... BSC (1.27 - 1.65) (2.54 BSC) 0.015 MIN (0.38 MIN) SEATING PLANE 0.016 - 0.022 (0.40 - 0.56) Package: S20 20-Pin SOIC 0.291 - 0.301 0.398 - 0.412 (7.39 - 7.65) (10.11 - 10.47) 0.095 - 0.107 (2.41 - 2.72) 0º - 8º 0.005 - 0.013 SEATING PLANE (0.13 - 0.33) ML4821 0.295 - 0.325 (7.49 - 8.26) 0.008 - 0.012 0º - 15º (0.20 - 0.31) 0.022 - 0.042 0.007 - 0.015 (0.56 - 1.07) (0.18 - 0.38) 11 ...

Page 12

... ML4821 Ordering Information Part Number ML4821CP ML4821CS 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; ...

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