GS-R12VXXX1.5 [ETC]
1.8W TO 7.5W STEP DOWN SWITCHING REGULATOR FAMILY ; 1.8W TO 7.5W的降压开关稳压器系列\n
| 型号： | GS-R12VXXX1.5 |
| 厂家： | 
ETC |
| 描述： | 1.8W TO 7.5W STEP DOWN SWITCHING REGULATOR FAMILY
|
| 文件： | 总5页 (文件大小：60K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R12VXXX1.5
1.8W TO 7.5W STEP DOWN SWITCHING REGULATOR FAMILY
PRELIMINARY
FEATURE
■ MTBF 1 000 000 hours (
T =25 C)
amb
■ 1.5A max output current
■ 15V max input voltage
■ 1.5V max drop-out voltage
■ Not-latching overload and short circuit
protection
■ Thermal shutdown
■ No heatsink required
DESCRIPTION
The GS-R12VXXX1.5 series is a family of high effi-
ciency step down switching voltage regulator, de-
signed to replace linear regulators.
ORDERING NUMBER: GS-R12VXXX1.5
The foot print of GS-R12V perfectly fits a standard
TO220 package.
Based on STM L5973 device, this non isolated family
of regulators are suitable for the full spectrum of ap-
plications including telecom, industry, computer and
distributed power system applications having a wide-
ly ranging input voltage.
SELECTION CHART
Type
Ordering
Number
Output
Voltage
[V]
Input
Voltage
[V]
Output
Ripple
[mVpp]
Efficiency
[%]
Notes
GS-R12V0121.5
GS-R12V0181.5
GS-R12V0251.5
GS-R12V0331.5
GS-R12V0501.5
35
35
35
35
35
68
72
76
82
85
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
1.235 ± 3%
1.8 ± 4%
2.5 ± 4%
3.3 ± 4%
5.0 ± 4%
4.5 ÷ 15
4.5 ÷ 15
4.5 ÷ 15
4.5 ÷ 15
6.6 ÷ 15
October 2003
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This is preliminary information on a new product now in development. Details are subject to change without notice.
GS-R12VXXX1.5
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
16
Unit
V
DC Input Voltage
V
i
I
Maximum Output Current
int. limit
out
T
Storage Temperature Range
°C
°C
-40 ÷ 105
-25 ÷ 70
stg
T
Operating Ambient Temperature
op
CONNECTION DIAGRAM AND MECHANICAL DATA
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GS-R12VXXX1.5
PIN DESCRIPTION
Pin
Function
+ input
GND
Description
1
2
3
DC input voltage
Common GND
+ output
Regulated DC output voltage
ELECTRICAL CHARACTERISTICS (T =25 C, unless otherwise specified.)
amb
Symbol
Parameter
Test Condition
V =V + 1.5V I = 1.5A
Min.
Typ.
Max.
Unit
Temperature Stability
mV/°C
i
o
o
I
Output Current
0
1.5
A
A
V =4.5 ÷ 15V
o
i
I
oL
Current Limit
2.5
1.8
250
V =4.5 ÷ 15V
i
I
q
Quiescent Current
Switching Frequency
Supply Voltage Rejection
Ripple Voltage
V =12V I = 0A
2.5
mA
kHz
i
o
f
V =12V I = 1.5A
225
275
s
i
o
SRV
mV/V
mVpp
°C/W
V
V =12V I = 1A/1.5A
25/35
r
i
o
R
Thermal Resistance
Case to ambient
th
USER NOTES
Input Voltage
The recommended operating maximum DC Input Voltage is 15V inclusive of ripple voltage.
Current protection
The device has two current limit protections, pulse by pulse and frequency fold back.
The current is sensed through a resistor and if 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 suf-
ficiently low duty cycle at 250 Hz, the output current, in strong overcurrent or short circuit conditions, could in-
crease again.
For this reason the switching frequency is also reduced, so keeping the inductor current under its maximum
threshold.
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
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GS-R12VXXX1.5
detection.
An hysteresis of approximately 20ºC avoids that the devices turns on and off continuously.
Thermal Characteristics
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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GS-R12VXXX1.5
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics.
All other names are the property of their respective owners
© 2003 STMicroelectronics - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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