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LT4430 Datasheet(PDF) 10 Page - Linear Technology |
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LT4430 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LT4430 10 4430f S I FOR ATIO APPLICATIO circuitry, especially since the gate drivers typically use a supply voltage between 5V to 12V. The preregulator circuit finds wide use in fully synchronous forward converters, push-pull converters and full-bridge converters. Generate a bias supply for a forward converter using similar techniques to that of the flyback converter. Figure 3a to 3c detail the three common bias circuits for the synchronous • 4430 F02a T1 N2 N1 1:N N = N1 + N2 VOUT COUT *OPTIONAL SEE TEXT • LT4430 VBIAS C1 R1* D2 D1 •• VIN • • VIN 4430 F02b T1 1:N VOUT LT4430 VBIAS COUT C1 R1* D2 C2 *OPTIONAL SEE TEXT D1 R3* R2 QBS Z1 Figure 2a. Flyback Converter with Tapped Secondary Bias Figure 2b. Flyback Converter with Preregulator Bias • • VIN 4430 F03a T1 1:N VOUT COUT CG *OPTIONAL SEE TEXT L1 Q2 FG Q1 LT4430 VBIAS C1 R1* D1 4430 F03b • • T1 N1 N2 1:N N = N1 + N2 VOUT COUT CG *OPTIONAL SEE TEXT L1 Q2 LT4430 VBIAS C1 R1* D1 •• VIN FG Q1 • • VIN 4430 F03c T1 1:N VOUT LT4430 VBIAS COUT C1 R1* D1 C2 CG *OPTIONAL SEE TEXT L1 Q2 FG Q1 R3* R2 QBS Z1 Figure 3a. Typical Single-Switch Synchronous Forward Converter with Bias Generator Figure 3b. Single-Switch Synchronous Forward Converter with Tapped Secondary Bias Generator Figure 3c. Single-Switch Synchronous Forward Converter with Preregulator Bias Generator single-switch forward converter. In the flyback converter of Figure 1d, the bias supply is proportional to VIN and VOUT. However, in the forward converter, L1’s presence decouples the bias supply from VOUT. In Figure 3a, the bias supply equals (VIN • N – VF). In Figure 3b, the bias supply equals (VIN • N1/N – VF). In Figure 3c, the bias supply equals (VZ1 – VF). |
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