CL,th
CL,th
CL
out
CL
CL
CL
CL
out
V
V
K
I
I
R
R
K
I
u
o
Variable Resistor for CL
8
SLVUB86 – August 2017
Copyright © 2017, Texas Instruments Incorporated
TPS1H000-Q1 Evaluation Module (EVM)
5
Variable Resistor for CL
5.1
Current Limit Resistor
An external resistor is used to convert a proportional load current into a voltage, which is compared with
an internal reference voltage. When the voltage on the CL pin exceeds the reference voltage, the current
is clamped.
The inherent current limit (I
lim,nom
) is still present when using an external current limit. The smaller value of
the internal or external set value decides the actual nominal current limit. If the user decides not to use the
external programmable current, tie the CL pin to ground.
shows the equation for calculating the current limit resistance.
(1)
R5 is a variable resistor, from 0
Ω
to 10 k
Ω
. The CL resistor can be changed through R5. When 0
Ω
, there
is no external current limit function and the internal current limit is active. When 5 k
Ω
, the current limit
value is around 0.048 A.
