MAX5095BAUA 데이터 시트보기 (PDF) - Maxim Integrated

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MAX5095BAUA

High-Performance, Single-Ended, Current-Mode PWM Controllers

Maxim Integrated 

High-Performance, Single-Ended, Current-Mode

PWM Controllers

RT/CT

OUT

ADV_CLK

Figure 4. ADV_CLK

tADV_CLK = 110ns

tPULSE = 85ns

Advance Clock Output (ADV_CLK) (MAX5095C)

ADV_CLK is an advanced pulse output provided to

facilitate the easy implementation of secondary-side

synchronous rectification using the MAX5095C. The

ADV_CLK pulse width is 85ns (typically) with its rising

edge leading the rising edge of OUT by 110ns. Use

this leading pulse to turn off the secondary-side syn-

chronous-rectifier MOSFET (QS) before the voltage

appears on the secondary (see Figure 8). Turning off

the secondary-side synchronous MOSFET earlier

avoids the shorting of the secondary in the forward

converter. The ADV_CLK pulse can be propagated to

the secondary side using a pulse transformer or high-

speed optocoupler. The 85ns pulse, with 3V drive volt-

age (10mA source), significantly reduces the

volt-second requirement of the pulse transformer and

the advanced pulse alleviates the need for a high-

speed optocoupler.

Thermal Shutdown

When the MAX5094/MAX5095’s die temperature goes

above +150°C, the thermal shutdown circuitry will shut

down the 5V reference and pull OUT low.

Typical Application Circuits

VIN

RST

CST

R1

R2

RT

CT

1 COMP

8

REF

2 FB MAX5094_ VCC 7

3 CS

6

OUT

4

RT/CT

5

GND

VOUT

N

RCS

Figure 5. MAX5094_ Typical Application Circuit (Isolated Flyback with Primary-Side Regulation)

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