LD5537GL datasheet(11/17 Pages) LEADTREND

11 / 17 page

LD5537

09/07/2015

Leadtrend Technology Corporation

www.leadtrend.com.tw

LD5537-DS-01 September 2015

PEAK(MAX)

0.75V

OUT

VCC

GND

Cbulk

COMP

VIN

Line

LD5537

Fig. 16

A 250nS leading-edge blanking (LEB) time is included in

the input of CS pin to prevent false-triggering from the

current spike. In those low power applications, if the total

pulse width of the turn-on spikes is less than 150nS and

the negative spike on the CS pin below -0.3V, the R-C

filter is free to eliminate. (As shown in Fig. 17).

However, the total pulse width of the turn-on spike is

subject to output power, circuit design and PCB layout.

is strongly recommended to adopt a smaller R-C filter (as

shown in Fig. 18) for large power application to avoid the

CS pin being damaged by the negative turn-on spike.

VCC

GND

LD5537

Can be removed if the negative

spike is not over spec. (-0.3V).

OUT

150ns

blanking time

Fig. 17

VCC

GND

LD5537

R-C filter is required when the negative

spike exceeds -0.3V or the total spike width

is over 250nS LEB period.

OUT

Fig. 18

Output Stage and Maximum Duty-Cycle

An output stage of a CMOS buffer, with typical 500mA

driving capability, is incorporated to drive a power

MOSFET directly.

And the maximum duty-cycle of

LD5537 is limited to 85% to avoid the transformer

saturation.

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