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GS-R24F Schematic ( PDF Datasheet ) - ST Microelectronics

Teilenummer GS-R24F
Beschreibung DC/DC Converter Modules
Hersteller ST Microelectronics
Logo ST Microelectronics Logo 




Gesamt 12 Seiten
GS-R24F Datasheet, Funktion
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GS-R24F
2A DC/DC converter modules
Features
MTBF 1 000 000 hours (TA = 25° C)
2A max output current
35V max input voltage
1.5V max drop-out voltage
Remote logic inhibit/enable
Synchronization
Not-latching overload and short circuit
protection
Thermal shutdown
Fixed or adjustable output
No heatsink required
Operating temperature range -25°C ÷ 85°C
Description
The GS-R24F series is a family of high efficiency
step down switching voltage regulator, designed
to replace linear regulators.
Based on ST L5973 device, these non isolated
regulators are suitable for various applications,
including telecom, industry, computer and
distributed power supply system having a wide
range input voltage.
Order codes
Part number
GS-R24F0182.0
GS-R24F0252.0
GS-R24F0332.0
GS-R24F0502.0
GS-R24F0002.0
GS-R24F1201.5
GS-R24F0001.0
Output Voltage
[V]
1.8 ± 4%
2.5 ± 4%
3.3 ± 4%
5.0 ± 4%
1.235 ÷ 5.5
12 ± 4%
3.3 ÷ 24
Input Voltage
[V]
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
Output Ripple Efficiency
[mVpp]
[%]
Notes
25
25
25
25
25
100
100 ÷ 250
72
76
82
85
68 ÷ 85
91
78 ÷ 96
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Progr. output voltage
Fixed output voltage
Progr. output voltage
October 2006
Rev 1
1/12
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GS-R24F Datasheet, Funktion
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Application information
4 Application information
GS-R24F
4.1 Input voltage
The recommended maximum operating DC Input Voltage is 35V including ripple voltage.
4.2 Reference voltage
No capacitor is required for stability.
4.3 Inhibit function
The inhibit feature allows to put the device in stand-by mode.
With INH pin 1 is higher than 2.2V the device is disabled and the current consumption is
reduced to less than 150µA for VI = 35V.
With INH pin lower than 0.8V, the device is enabled.
If the INH pin is left floating, an internal pull up ensures that the voltage at the pin reaches
the inhibit threshold and the device is disabled.
The pin can be pulled to VI to disable the device.
4.4 Multiple units synchronization
Using more than one unit on the same circuit, it is possible to synchronize the switching
frequency, connecting all pin 12 together (see Figure 4).
The unit with higher frequency becomes the master.
4.5 Current limitation
The device has two current limit protections, pulse by pulse and frequency fold back.
The current is sensed through a resistor and if it reaches the threshold, the on time is
reduced and consequently the output voltage, too.
Since the minimum switch ON time (necessary to avoid false overcurrent signal) is not
enough to obtain a sufficiently low duty cycle at 250Hz, the output current could increase
again, in strong overcurrent or short circuit conditions.
For this reason the switching frequency is also reduced to keep the inductor current within
its maximum threshold limit.
The frequency depends on the feedback voltage.
As the feedback voltage decreases (due to the reduced duty cycle), the switching frequency
decrease too.
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GS-R24F pdf, datenblatt
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GS-R24F
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