LM5035C

CS

LO

AGND

Power

Transformer

HO

Q2

Q1

R1

VIN

Current

Sense

LM5035C

9V

8.3V - 15V

(from aux winding)

VIN

VCC

LM5035C

50

0.1 PF

VIN

LM5035C

SNVS631C – JANUARY 2010 – REVISED MARCH 2013

www.ti.com

Current Sense

The CS pin needs to receive an input signal representative of the transformer’s primary current, either from a

current sense transformer or from a resistor in series with the source of the LO switch, as shown in Figure 20

ground connection from the current sense transformer, or R1, should be a dedicated track to the AGND pin. The

current sense components must provide greater than 0.25V at the CS pin when an over-current condition exists.

Figure 18. Input Transient Protection

Figure 20. Current Sense Using Current Sense Transformer

18

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