ml4812 Fairchild Semiconductor, ml4812 Datasheet
ml4812
Available stocks
Related parts for ml4812
ml4812 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 COMP Description – – ERROR AMP ...
Page 2
... OUT NC 6 OVP 7 11 PWR GND I SINE 8 10 SHDN 9 CLOCK Function ). A resistor to ground sets the current which T and I SINE . T PRODUCT SPECIFICATION ML4812 REF OUT 14 PWR GND Top View in the gain modulator. EA REV. 1.0.4 5/31/01 ...
Page 3
... PLCC 16-Pin PDIP Note: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Operating Conditions Temperature Range ML4812CX 3 1 PRODUCT SPECIFICATION 30mA 1.0A 5µJ 1 ...
Page 4
... SINE REF I = 500µA, EA– 20mV SINE REF I = 1mA, EA– – 20mV SINE REF I = 500µA, EA– – 20mV, SINE REF I = 50µA RAMP COMP 12V < V < 25V CC ML4812 Min. Typ. Max. Units 91 98 105 kHz 0 108 kHz 3.3 V 4.8 5.0 5.2 V 7.8 8.4 9 ...
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 Current Propagation Delay I Trip Point ...
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 Block Diagram SET 5.6V - Figure 2. Oscillator Timing Resistance vs. Frequency Figure 3. Output Saturation Voltage vs. Output Current ...
Page 7
... Figure 6. Gain Modulator Block Diagram 0 500 -30 400 -60 PHASE 300 -90 200 -120 100 -150 0 -180 1M 10M 0 ML4812 ERROR CURRENT 9V I SINE ERROR CURRENT – I RAMP COMP / RAMP COMP 4.5 4.0 3.5 3.0 2.5 2.0 1.5 100 200 300 400 500 SINE INPUT CURRENT ( A) Figure 7. Gain Modulator Linearity ...
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 –60 –40 Figure 9b. Supply Current ( -12 - REF ...
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
... 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 — Main Inductor Manufacturer Part # Micrometals T225-8/90 Micrometals T184-40 58076-A2 (high flux) ML4812 Turns (#24AWG) 200 120 180 11 ...
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
... Electrolytic 10µF, 25V Electrolytic 0.47µF, 50V Ceramic 0.002µF, 50V Ceramic 1N5406 (Fairchild) MUR860 (Fairchild) 1N4148 (Fairchild) 5A, 250V 3AG with clips ML4812CP (Fairchild) 2mH (see note) PEAK FQP9N50 (Fairchild) KA7815 (Fairchild) PN2222 (Fairchild) 180k 10k TRIMPOT BOURNS 3299 or equivalent 3 ...
Page 15
... PRODUCT SPECIFICATION + Figure 13. 1kW Input Power, Power Factor Correction Circuit REV. 1.0.4 5/31/01 ML4812 15 ...
Page 16
... BSC (2.54 BSC) 0.015 MIN (0.38 MIN) SEATING PLANE Package: Q20 20-Pin PLCC 0.042 - 0.056 (1.07 - 1.42) 0.350 - 0.356 0.385 - 0.395 16 (8.89 - 9.04) (9.78 - 10.03) 0.009 - 0.011 (0.23 - 0.28) 0.165 - 0.180 0.146 - 0.156 (4.19 - 4.57) (3.71 - 3.96) SEATING PLANE (7.49 - 8.26) 0.008 - 0.012 0º - 15º (0.20 - 0.31) 0.025 - 0.045 (0.63 - 1.14) (RADIUS) 0.200 BSC 0.290 - 0.330 (5.08 BSC) (7.36 - 8.38) 0.100 - 0.110 (2.54 - 2.79) ML4812 16 ...
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; ...