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UC3843AD Datasheet(PDF) 11 Page - ON Semiconductor |
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UC3843AD Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 14 page UC3842A, 43A UC2842A, 43A 11 MOTOROLA ANALOG IC DEVICE DATA Figure 20. External Clock Synchronization Figure 21. External Duty Cycle Clamp and Multi Unit Synchronization Figure 22. Adjustable Reduction of Clamp Level Figure 23. Soft–Start Circuit Figure 24. Adjustable Buffered Reduction of Clamp Level with Soft–Start Figure 25. Current Sensing Power MOSFET Virtually lossless current sensing can be achieved with the implementation of a SENSEFET power switch. For proper operation during over current conditions, a reduction of the Ipk(max) clamp level must be implemented. Refer to Figures 22 and 24. The diode clamp is required if the Sync amplitude is large enough to cause the bottom side of CT to go more than 300 mV below ground. External Sync Input 47 5(9) R R Bias Osc Vref RT 8(14) 4(7) 2(3) 1(1) 0.01 CT 2R R EA + – + 5(9) R R Bias Osc 8(14) 4(7) 2(3) 1(1) 2R R EA + – + 7 5.0k 3 8 6 5 1 C R S MC1455 2 RA + – + – 4 Q 5.0k RB To Additional UCX84XA’s f = 1.44 (RA + 2RB)C Dmax = RB RA + 2RB 5(9) R R Bias Osc 8(14) 4(7) 2(3) 1(1) 2R R EA + – + Q1 RS 3(5) 5(8) 1.0V – R S Q Comp/Latch 5.0Vref VClamp Vin VCC 7(11) 6(10) – + + – + – + 7(12) + – R1 R2 R2 VClamp = 1.67 + 1 + 0.33 x 10 – 3Ipk(max) = VClamp RS Where: 0 ≤ VClamp ≤ 1.0 V R2 R1 1.0mA R1 R1 + R2 5(9) R R Bias Osc 8(14) 4(7) 2(3) 1(1) 2R R EA + – + 1.0V – R S Q 5.0Vref – + + – + C tSoft–Start 3600C in µF 1.0M 1.0mA 5(9) R R Bias Osc 8(14) 4(7) 2(3) 1(1) 2R R EA + – + Q1 RS 3(5) 5(8) 1.0V – R S Q Comp/Latch 5.0Vref VClamp Vin VCC 7(11) 6(10) – + + – + – + 7(12) + – MPSA63 R1 R2 C tSoftstart = – In 1 – VC R1 R2 C R2 VClamp = 1.67 + 1 Ipk(max) = VClamp RS Where: 0 ≤ VClamp ≤ 1.0 V 1.0mA R1 3VClamp R1 + R2 RS 1/4 W (5) (8) – R S Q Comp/Latch 5.0Vref Vin VCC (11) (10) – + + – + – + (12) + – Power Ground To Input Source Return VPin 5 = If: SENSEFET = MTP10N10M RS = 200 Then: Vpin 5 = 0.075 Ipk SENSEFET RS Ipk rDS(on) M G D S K Control CIrcuitry Ground: To Pin (9) rDM(on) + RS |
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