UC3848_11

UNISONIC TECHNOLOGIES CO., LTD UC3848 HIGH PERFORMANCE CURRENT MODE CONTROLLERS DESCRIPTION The UTC UC3848 is designed to provide several special enhancements to satisfy the needs, for example, Power-Saving mode for low standby power ( 5V VSS=4.8V,VFB=3V VCS > 0V, SS Open CSS=0.47uF VFB > 5V, VCC=22V VFB > 5V 4.4 1.5 1.6 1.7 68 74 21 11.2 19 28 4.9 62 135 4.1 5.4 220 0.86 0.77 61 20 68 0 16 9.9 75 40 80 26 12.6 4.7 55 120 3.9 5.1 VFB=4.4V IVIN=60uA ISOURCE = 200 mA ISINK = 200 mA CL = 1.0 nF CL = 1.0 nF 1 2.5 12.2 200 50 300 90 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UC3848 FUNCTIONAL DESCRIPTION LINEAR INTEGRATED CIRCUIT The internal reference voltages and bias circuit work at VCC> VTHD (ON), and shutdown at VCCT (THR) for continual a blanking time. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 11 QW-R103-033.F UC3848 FUNCTIONAL DESCRIPTION(Cont.) LINEAR INTEGRATED CIRCUIT (7)Protection section (Cont.) OLP After soft-start phase end, IC will shutdown driver if over load state occurs for continual TD-OLP. OLP function will not inactive during soft-start phase. OLP case as followed FIG. 6. The test circuit as followed FIG.8. TD-OLP=5.53×TSS. OVP There are two kinds of OVP circuits, the first OVP function are enabled only when VSSVFB(OLP) during soft-start phase. During above condition, driver will be shutdown if over voltage state occurs (VCC>VOVP1) for continual a blanking time. The first OVP function will not inactive after soft-start phase. The second OVP will shutdown the switching of the power MOSFET whenever VCC>VOVP2. The first OVP case as followed FIG.7. The test circuit as followed FIG. 9. FIG.6 OLP case FIG.7 OVP case FIG.8 OLP test circuit FIG.9 OVP test circuit 8 of 11 QW-R103-033.F UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UC3848 TYPICAL APPLICATION CIRCUIT YC1 R6 LINE F1 R1 R2 NEUT 1 3 L1 24 4 BD1 3 1 C1 t° TR1 2 R5 R3 R4 D1 10 C2 9 T1 1 2 C8 LINEAR INTEGRATED CIRCUIT L2 D2 C4 C5 LD1 R11 C10 1 3 L3 2 4 12V/1.25A 15W GND ZNR1 XC1 3 4 8 R12 7 VCC D3 7 IC1 OUT 6 2 M1 C3 6 R7 IC2 4 3 1 2 4 VIN SS 1 R14 R10 FB GND 5 CS 3 C9 IC3 R8 C6 R13 C7 R9 FIG.12 UC3848 Typical Application Circuit Table1 Components Reference description for UC3848 application circuit DESIGNATOR PART TYPE DESIGNATOR PART TYPE DESIGNATOR PART TYPE C1 33μF R1 2.2MΩ D1 FR107 C2 0.001μF R2 2.2MΩ D2 SB5100 C3 22μF R3 68KΩ D3 RS1D UC3848 C4 470μF R4 100Ω IC1 C5 470μF R5 1MΩ IC2 PC-817 C6 0.1μF R6 15Ω IC3 TL431 C7 0.01μF R7 560Ω YC1 222 C8 0.001μF R8 1KΩ T1 EE25 C9 0.1μF R9 3.9KΩ L1 UU10.5 C10 220μF R10 15KΩ L2 2μH R11 10KΩ L3 Ring Choke R12 1.5MΩ~4MΩ LD1 LED R13 1.0Ω F1 2A/250V R14 1.8KΩ ZNR1 7D471K TR1 SCK102R55A XC1 334/275V BD1 KBP205 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 11 QW-R103-033.F UC3848 TYPICAL CHARACTERISTICS 12V 10V 8V 6V 4V 2V 0 -2V 0 2000 Time (400μs/div) Startup With Full Load Condition at VAC=90V, VSS and VOUT 4000 Feedback Voltage During Loadjump From 10% Up To 100% Load (VAC=90V) 12V 10V 8V 6V 4V 2V 0 -2V 0 LINEAR INTEGRATED CIRCUIT Feedback Voltage During Loadjump From 10% Up To 100% Load (VAC=264V) 2000 Time (400μs/div) Startup With Full Load Condition at VAC=264V, VSS and VOUT 4000 8V 6V 4V 2V 0 10V 5V 0 0 8V 6V 4V 2V VSS 0 10V 5V VSS VOUT 0 100 0 VOUT 50 Time (10ms/div) Startup Behavior At Nominal Load Condition VAC=90V 50 Time (10ms/div) Startup Behavior At Nominal Load Condition VAC=264V 100 8V 6V 4V 2V 0 4V 2V 0 0 8V 6V 4V 2V VSS 0 4V 2V VSS VFB 0 20 Time (4ms/div) 40 0 VFB 20 Time (4ms/div) 40 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 11 QW-R103-033.F UC3848 TYPICAL CHARACTERISTICS(Cont.) Frequency vs. Output Power 80 0.8 0.7 60 0.6 0.5 40 VAC=90V 0.4 0.3 20 0.2 0.1 0 0 1 2 345678 Output Power, POUT(W) 9 10 0 LINEAR INTEGRATED CIRCUIT NO Load Input Power vs. Line Voltage (Normal Mode) DC Input Voltage, VIN(V) Input Power NO Load (PoUT=0W) 200 250 150 100 AC Input Voltage, VIN (V) 300 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 11 of 11 QW-R103-033.F