TPS1H100-Q1
ZHCSDD8D –OCTOBER 2014–REVISED DECEMBER 2019
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7.2 Functional Block Diagram
DRAIN (VS)
Internal LDO
Internal
Reference
IN
Charge Pump
Gate Driver
VDS Clamp
DIAG_EN
Open Load
Detection
ST
Diagnostics
and Protection
Current Limit
CL
SOURCE(OUT)
Thermal
Monitor
Current Sense
CS
GND
7.3 Feature Description
7.3.1 Accurate Current Sense
For version B, the high-accuracy current-sense function is internally implemented, which allows a better real-time
monitoring effect and more-accurate diagnostics without further calibration. A current mirror is used to source
1 / K of the load current, flowing out to the external resistor between the CS pin and GND, and reflected as
voltage on the CS pin.
K is the ratio of the output current and the sense current. It is a constant value across the temperature and
supply voltage. Each device was internally calibrated while in production, so post-calibration by users is not
required in most cases.
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