LV5604TA

No.A2027-11/12

(4) External input CLK function (CLK_IN)

Switching operation can be synchronized with external clock input (CLK_IN) by using the CLK_IN pin.

• External clock (CLK_IN) frequency and input level

When using external clock (CLK_IN) input, input a frequency equal to the internal oscillation frequency +20% or

more to CLK_IN. In addition, the CLK_IN configuration is shown in the figure “CLK_IN (input) equivalent circuit

(outline)” below.

The 0.8V reference voltage and CLK_IN are compared to determine the edges, so input a signal of 0.8V or more

(VCC voltage or less) as the external clock (CLK_IN).

• External/internal clock switching

Set the CTL pin Low before switching between the external clock and the internal clock.

• Maximum ON duty

The maximum ON duty (Duty_MAX*) of channel 1 to channel 4 is the 85% (typ.) setting. When using the external

clock (CLK_IN), the maximum ON duty (Duty_MAX*) becomes smaller, so care must be taken for the set output

voltage.

(CLK_IN (input) equivalent circuit (outline))

(5) SCP function

• Description of operation

When FB1 to FB8 go High due to the load being shorted or other reason, charging to the SCP pin starts, and if output

does not recover during the set time Tscp, the protective circuit (SCP) operates. When the protection circuit (SCP)

operates, all channel outputs are turned OFF. When not using the protection function (SCP), the SCP pin must be

shorted to GND_S with a line that is as short as possible.

When the SCP function operates and SCP_OUT goes High, all outputs are latched OFF. This latched state is

canceled by setting the CTL pin Low or by turning the power supply off.

• SCP_OUT

The SCP_OUT pin functions to notify an external microcontroller or other component of the SCP (short circuit

protection) and CTL status. The output configuration is an open drain output, and a pull-up resistor is used. When

not used, leave this pin open.

• Switching time

The SCP_OUT switching time is set by the capacitor connected to the SCP pin.

(SCP charging operation)

(SCP and SCP_OUT operation)

CLK_IN

0.8V

SCP [V]

SCP

CTL

SCP_OUT

T [s]

tscp

SCP operation

Charging with

Iscp = 4 [

μA]

Threshold voltage

1.25 (TYP)

Output short circuit

1.25 [V]

(TYP)