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MAX5052BEUA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX5052BEUA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 13 page Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies 10 ______________________________________________________________________________________ Internal Error Amplifier The MAX5052/MAX5053 include an internal error ampli- fier that can be used to regulate the output voltage in the case of a nonisolated power supply (see Figure 1) Calculate the output voltage using the following equation: where VREF = 1.23V. The amplifier’s noninverting input is internally connected to a digital soft-start circuit that gradually increases the reference voltage during start- up and is applied to this pin. This forces the output volt- age to come up in an orderly and well-defined manner under all load conditions. The error amplifier may also be used to regulate the ter- tiary winding output which implements a primary-side regulated, isolated power supply (see Figure 5). Calculate the output voltage using the following equation: where NS is the number of secondary turns for VOUT1, NT is the number of tertiary winding turns, and both VD6 and VD1 are the diode drops at the respective outputs. V N N R R VV V OUT S T REF D D 16 1 1 1 2 =+ + − V R R V OUT REF =+ 1 5 6 IN FB_P D8 D6 R6 33kΩ +VIN +VIN C16 15µF 35V C1 1µF 100V C2 1µF 100V C12 0.22µF R7 1.2kΩ R12 1.2kΩ D7 * OPEN 5 4 3 2 1 R8 * OPEN C10 * OPEN D3 * OPEN T1 9 7 6 10 8 C6 0.0047µF 250VAC D1 L2 C3 68µF 6.3V C4 22µF 6.3V D4 C13 1µF L1 D2 C5 47µF 25V D5 C15 1µF VOUT2 (+15V/0.1A) VOUT1 (+5V/1.5A) SGND SGND N1 6 5 4 1 2 3 7 8 R5 0.17Ω 1% *COMPONENTS MARKED "OPEN" ARE OPTIONAL. (SEE MAX5052A EV KIT DATA SHEET.) C8 OPEN R11 100Ω IN C11 0.22µF R10 0Ω 8 6 4 5 FB_P R1 22.6kΩ 1% R2 2.49kΩ 1% R9 4.3kΩ C9 2200pF C14 0.022µF R3 1MΩ 1% R4 42.2kΩ 1% +VIN -VIN SHDN JU1 C7 0.22µF MAX5052A 2 3 1 7 FB COMP UVLO/EN VCC VIN NDRV CS GND U1 Figure 5. Primary Regulated, Dual-Output, Isolated Telecom Power Supply DQ Q DQ Q OSCILLATOR 1.048MHz 262kHz WITH 50% (MAX5052A/MAX5053A) 262kHz WITH 75% (MAX5052B/MAX5053B) Figure 6. Internal Oscillator |
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