IC POWER FACTOR CTRLR 20-PLCC

ML4812CQ

Manufacturer Part NumberML4812CQ
DescriptionIC POWER FACTOR CTRLR 20-PLCC
ManufacturerFairchild Semiconductor
ML4812CQ datasheet
 


Specifications of ML4812CQ

ModeCritical Conduction (CRM)Current - Startup800µA
Voltage - Supply12 V ~ 18 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case20-PLCC
Switching Frequency105 KHzMaximum Operating Temperature+ 150 C
Mounting StyleSMD/SMTMinimum Operating Temperature- 65 C
Lead Free Status / RoHS StatusLead free / RoHS CompliantFrequency - Switching-
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ML4812
Power Factor Controller
Features
Block Diagram
(Pin Configuration Shown is for DIP Version)
OVP
+
5
5V
I SENSE
1
5V
GM OUT
2
EA OUT
3
EA–
4
+
5V
I SINE
GAIN MODULATOR
6
RAMP COMP
7
C T
16
R T
8
Description
S
Q
+
R
Q
ERROR
AMP
I EA
5V
OSC
www.fairchildsemi.com
SHDN
10
V CC
OUT
12
PWR GND
11
V REF
UNDER
14
VOLTAGE
V CC
LOCKOUT
13
32V
GND
15
CLOCK
9
1k
REV. 1.0.4 5/31/01

ML4812CQ Summary of contents

  • Page 1

    ML4812 Power Factor Controller Features Block Diagram (Pin Configuration Shown is for DIP Version) OVP + 5 – SENSE OUT 2 EA OUT 3 EA– – SINE GAIN MODULATOR 6 RAMP ...

  • Page 2

    ML4812 Pin Configuration ML4812 16-Pin PDIP (P16) I SENSE 1 GM OUT 2 EA OUT 3 EA– 4 OVP 5 I SINE 6 RAMP COMP Top View Pin Description Number Name 1 I Input from the ...

  • Page 3

    ML4812 Absolute Maximum Ratings Supply Current ( Output Current Source or Sink (OUT) DC Output Energy (capacitive load per cycle) Gain Modulator I Input (I ) SINE SINE Error Amp Sink Current (EA OUT) Oscillator Charge Current Analog ...

  • Page 4

    PRODUCT SPECIFICATION Electrical Characteristics Unless otherwise specified 15V , R CC Parameter Oscillator Initial Accuracy Voltage Stability Temperature Stability Total Variation Ramp Valley to Peak R Voltage T Discharge Current (R open) T Clock Out Voltage Low Clock ...

  • Page 5

    ML4812 Electrical Characteristics Unless otherwise specified 15V , R CC Parameter OVP Comparator Input Offset Voltage Hysteresis Input Bias Current Propagation Delay PWM Comparator: I SENSE Input Offset Voltage Input Offset Current Input Common Mode Range Input Bias ...

  • Page 6

    ML4812 Functional Description Oscillator EXTERNAL CLOCK C SYNC SYNC 10 I SET SYNC 8.4mA Q 1 CLOCK t D RAMP PEAK V RAMP VALLEY Figure 1. Oscillator ...

  • Page 7

    PRODUCT SPECIFICATION Output Driver Stage Error Amplifier Gain Modulator 5V 0.5mA + EA– – OUT 3 Figure 4. Error Amplifier Configuration 100 GAIN 0 -20 10 100 1k 10k 100k FREQUENCY (Hz) Figure 5. ...

  • Page 8

    ML4812 Typical Applications Input Inductor (L1) Selection ENABLE V REF V REF GEN. 9V INTERNAL – BIAS + Figure 8. Under-Voltage Lockout Block Diagram Figure 9a. Total Supply Current vs. Supply Voltage ...

  • Page 9

    PRODUCT SPECIFICATION Step 1: Step 2: Step 3: Step 4: REV. 1.0.4 5/31/01 Oscillator Component Selection Step 1: Step 2: Current Sense and Slope (Ramp) Compensation Component Selection ML4812 9 ...

  • Page 10

    ML4812 10 PRODUCT SPECIFICATION Voltage Regulation Components REV. 1.0.4 5/31/01 ...

  • Page 11

    PRODUCT SPECIFICATION Overvoltage Protection (OVP) Components Controller Shutdown Off-line Start-up and Bias Supply Generation Enhancement Circuit Table 1. Toroidal Cores (L1) Material Powdered Iron Powdered Iron Molypermalloy SPANG (Mag. Inc.) REV. 1.0.4 5/31/01 Construction and Layout Tips Magnetics Tips L1 ...

  • Page 12

    ML4812 COPPER FOIL SHORTED TURN Figure 11. Copper Foil Shorted Turn 12 T1 — Sense Transformer Material Size Code N27 R16/6.3 N30 R16/6.3 0.09" GAP PRODUCT SPECIFICATION Part # B64290-K45-X27 B64290-K45-X830 REV. 1.0.4 5/31/01 ...

  • Page 13

    PRODUCT SPECIFICATION Figure 12. Typical Application 200W Power Factor Correction Circuit REV. 1.0.4 5/31/01 ML4812 13 ...

  • Page 14

    ML4812 Table 2. Component Values/Bill of Materials for Figure 12 Reference C1 C5, C6 C8, C9 C10, C19 C11 C15 C16 C17 D1, D2, D3, D4, D10 D5 D6, D8, D9, D11, ...

  • Page 15

    PRODUCT SPECIFICATION + Figure 13. 1kW Input Power, Power Factor Correction Circuit REV. 1.0.4 5/31/01 ML4812 15 ...

  • Page 16

    PRODUCT SPECIFICATION Mechanical Dimensions 16 PIN 0.02 MIN (0.50 MIN) 0.055 - 0.065 (4 PLACES) (1.40 - 1.65) 0.170 MAX (4.32 MAX) 0.016 - 0.022 0.125 MIN (0.40 - 0.56) (3.18 MIN) 0.385 - 0.395 (9.78 - ...

  • Page 17

    ... ML4812 Ordering Information Part Number ML4812CP ML4812CQ 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; ...