MIC2133 datasheet(31/50 Pages) MICROCHIP

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DS20006653B-page 31

MIC2133

The TEMP pin voltage is given in the equation below.

EQUATION 4-30:

The CSH pin monitors the average inductor current by

using the bottom FET RDSON as a sense resistor. The

CSH pin voltage can be calculated using the equation

below.

EQUATION 4-31:

Because of the sense resistor type (NMOS FET), the

constant, K, depends on temperature.

To measure the real current through a PMBus, the

voltage values at the TEMP and CSH pins will be

used by a PMBus-enabled microcontroller to cancel the

temperature dependence and get a precise temperature-

independent measurement by calculating the corrected

value using a stable, known temperature dependency

and calibrating at 25°C.

The system input voltage and the output voltage are

also available from the MIC2133 converter. These volt-

ages can be sensed by the PMBus-enabled microcon-

troller, through appropriate resistive dividers, to convert

to digital form and communicate with the PMBus host

for telemetry.

Additionally, the external temperature from the individ-

ual channels can be measured by the PMBus-enabled

microcontroller through the external PN junction diode

placed at the hot spot in the channel (e.g., MOSFET or

inductor).

This is the mechanism through which the MIC2133

provides all the required process variables in the

system, as analog sense to the PMBus-enabled

microcontroller, which will provide telemetry to the

PMBus host controller.

4.5.14

FREQUENCY PROGRAMMING

The switching frequency per phase in CCM can be

programmed by the equation below:

EQUATION 4-32:

4.5.15

THERMAL SHUTDOWN

When the junction temperature of the MIC2133

reaches +160°C or above, the buck converter goes into

thermal shutdown. When the junction temperature falls

below +140°C, the MIC2133 buck converter soft starts

again.

VTEMP

TJ GTS VOS TS





Where:

TJ = MIC2133 Device Junction Temperature

GTS = Gain of Thermal Sense (6 mV/°C typical)

VOS(TS) = Offset Voltage of Thermal Sense Output

(1.8V typical)

VCSH

ILAVG



KVCSH 0A





Where:

IL(AVG) = Average Inductor Current

VCSH(0A) =1.2V = VCSH Voltage for IL(AVG) = 0A to Allow

2-Quadrant Monitoring (e.g., IL(AVG) ±10A)

K = Constant Factor

Where:

RFREQ = Resistor Connects from FREQ Pin to AGND

RFREQ =

20.1 × 109

fSW_PH

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