WCSA760

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©Winson, 2020/1/16

Page 8

(2)Current Switching - Formula Solution Method:

1. The Zero Current Value

1.1Measure the Zero Current Value V0A : Vset pin and Vout pin are

short-circuited, and output pin does not need to be connected to any load

which is as shown in Fig.11. The output voltage (Vout) is directly measured

by a multimeter under DC mode.

1.2The Measuring Current

↹VoltageV0A:measuretheoutput’svoltage

when no current pass through under the supply voltage 5V and record this

voltage.

VIP = V0A ≒2.5V

2. The Overcurrent Value

2.1Set the Reference Voltage Vset : Vset pin and Vout pin are

open-circuited, which is as shown in Fig.12. The Vset pin input voltage

range is 0~Vdd.

3.2The Overcurrent Current Value

↹VoltageVset:,WCSA760sensitivity

is about 32mV/A under the supply voltage 5V.

(ΔV = Current ﹡Sensitivity)

Example 1: the overcurrent value is 10A

Vset = V10A = (V0A+

ΔV) = 2.5+(10*0.032)≒2.82V

Example 2: the overcurrent value is -10A

Vset = V-10A = (V0A-

ΔV) = 2.5-(10*0.032)≒2.18V

Example 3: the overcurrent value is 20A

Vset = V20A = (V0A+

ΔV) = 2.5+(20*0.032)≒3.14V

3. Output : the output voltage levels will change according to the Vset voltage.

(3)Current Measuring

1. Supply Voltage :apply voltage Vdd。

2. Measure the Zero Current Output Voltage V0A (Internal Signal, VIP):

Vset pin and Vout pin are short-circuited, and output pin needs to be

connected capacitive load to GND, recommend value is 0.01uF. As shown

in Fig.13. (Internal circuit configuration of this device is used a comparator,

the phase compensation capacitance for oscillation prevention is not

included in the comparator. So users need to connect capacitive load in

parallel at output terminal if using in a negative feedback configuration.)