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GS-R12FP Datasheet(PDF) 8 Page - STMicroelectronics

Part No. GS-R12FP
Description  1.9 A DC-DC converter modules
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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GS-R12FP Datasheet(HTML) 8 Page - STMicroelectronics

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Application information
GS-R12FP
8/14
4.6
Thermal shutdown
The shutdown block generates a signal that turns OFF the power stage if the temperature of
the internal chip goes higher than a fixed internal threshold (150
°C min).
The sensing element of the chip is very close to the PDMOS area, so ensuring an accurate
and fast temperature detection.
An hysteresis of approximately 20
°C avoids that the devices turns ON and OFF
continuously.
4.7
Output voltage programming (GS-R12FP0001.9 only)
The GS-R12FP0001.9 output voltage is 5.54 V
±4 %, to reduce this value connect a resistor
between pin 10 (FB) and pin 9 (Vout).
The resistor must be located very close to the proper pins, to minimize the injected noise
(see Figure 4).
The resistor value is calculated using the following formula:
Rv = [(Vout - 1.235) * 11.3] / 5.54 - Vout) --[kΩ]
Vout can be adjusted between 1.235 V (Rv = 0 Ω) and 5.54 V (Rv = open)
4.8
Loop compensation (GS-R12FP0001.9 only)
If required by particular load conditions, it is possible to change the feedback loop
compensation, adding an external capacitor between pin 10 (FB) and pin 9 (Vout), which will
act as speed up (see Figure 5).


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