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參數(shù)資料
| 型號： | GS-R12VXXX1.5 |
| 英文描述： | 1.8W TO 7.5W STEP DOWN SWITCHING REGULATOR FAMILY |
| 中文描述： | 1.8W的7.5W降壓開關(guān)穩(wěn)壓器家族 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 88K |
| 代理商： | GS-R12VXXX1.5 |
GS-R12HXXX2
6/8
The frequency depends on the feedback voltage.
As the feedback voltage decreases (due to the reduced duty cycle), the switching frequency decrease too.
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
oC).
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
oC avoids that the devices turns on and off continuously.
Thermal Characteristics
Output voltage programming (GS-R12H0002 only)
The GS-R12H0002 output voltage is 5.05V
±4%, to reduce this value connect a resistor between pin 11 (FB)
and pin 12 (V
out
).
The resistor must be located very close to the proper pins, to minimize the injected noise (see figure 1).
The resistor value is calculated using the following formula:
Rv=[(V
out
-1.235)*10.2]/(5.05-V
out
)
--
[k
Ohm]
V
out
can be adjusted between 1.235V (Rv=0 Ohm) and 5.05V (Rv=open)
Loop compensation (GS-R12H0002 only)
If required by particular load conditions, it is possible to change the feedback loop compensation, adding an ex-
ternal capacitor between pin 11 (FB) and pin 12 (V
out
), which will act as speed up (see figure 2).
ADDITIONAL FEATURES AND PROTECTIONS
Feedback disconnection
In case of feedback disconnection, the duty cycle increases versus the maximum allowed value, bringing the
output voltage close to the input supply.
THis condition could destroy the load.
To avoid this dangerous condition, the device is turned off if the internal feedback pin remains floating.
Output overvoltage protection
The overvoltage protection, OVP, is realized by using an internal comparator, which input is connected to the
feedback, that turns off the power stage when the OVP threshold is reached.
This threshold is typically 30% higher than the feedback voltage.
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