GS-R12F0252.0 [STMICROELECTRONICS]
2A DC/DC converter modules; 图2A的DC / DC转换器模块
| 型号： | GS-R12F0252.0 |
| 厂家： | 
ST |
| 描述： | 2A DC/DC converter modules |
| 文件： | 总12页 (文件大小：203K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R12F
2A DC/DC converter modules
Features
■ MTBF 1 000 000 hours (TA = 25
■ 2A max output current
■ 16V max input voltage
■ 1.5V max drop-out voltage
■ Remote logic inhibit/enable
■ Synchronization
°
C)
■ 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-R12F 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
Output Voltage Input Voltage Output Ripple Efficiency
Part number
Notes
[V]
[V]
[mVpp]
[%]
GS-R12F0182.0
GS-R12F0252.0
GS-R12F0332.0
GS-R12F0502.0
GS-R12F0002.0
1.8 ± 4%
2.5 ± 4%
3.3 ± 4%
5.0 ± 4%
1.235 ÷ 5.5
4.5 ÷ 15
4.5 ÷ 15
4.5 ÷ 15
6.6 ÷ 15
4.5 ÷ 15
20
20
20
20
20
72
76
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Progr. output voltage
82
85
68 ÷ 85
October 2006
Rev 1
1/12
www.st.com
12
Contents
GS-R12F
Contents
1
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
2.3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermal de-rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Multiple units synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output voltage programming (GS-R12F0002.0 only) . . . . . . . . . . . . . . . . . 7
Loop compensation (GS-R12F0002.0 only) . . . . . . . . . . . . . . . . . . . . . . . . 7
5
Additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1
Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
7
Ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2/12
GS-R12F
Pin settings
1
Pin settings
1.1
Pin connection
Figure 1. Pin connection and mechanical data (dimensions in mm)
1.2
Pin description
Table 1.
Name
Pin description
Function
Description
A logic high level disables the device. When the pin is open, an
internal pull up disables the device
1
INH
2
3
Vref
Input +
3.3V reference voltage
DC input voltage
4
Input +
DC input voltage
5
Input GND
Input GND
Output GND
Output GND
Vout
Return for input voltage source
Return for input voltage source
Return for output voltage source
Return for output voltage source
Regulated power output
Regulated power output
6
7
8
9
10
Vout
Feedback input, available on adjustable device and on request for
additional compensation
11
12
FB
Sync
Master/Slave synchronization
3/12
Maximum ratings
GS-R12F
2
Maximum ratings
2.1
Absolute maximum ratings
Table 2.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
Vi
DC input voltage
16
internally limited
-0.3 to Vi
-0.3 to 4
4
V
Iout
V1
Maximum output current
INH
Sync
FB
V
V
V
V12
V11
2.2
2.3
Thermal data
Table 3.
Symbol
Absolute maximum ratings
Parameter
Storage temperature range
Operating ambient temperature
Value
Unit
Tstg
Top
-40 ÷ 105
-25 ÷ 85
°C
°C
Thermal de-rating
Table 4.
Symbol
Thermal de-rating for free air condition (all versions)
Parameter
Test condition
Value
Unit
Vi = 4.5 ÷ 16V, TA = 60°C (Max)
Vi = 4.5 ÷ 16V, TA = 65°C (Max)
Vi = 4.5 ÷ 16V, TA = 70°C (Max)
Vi = 4.5 ÷ 16V, TA = 75°C (Max)
Vi = 4.5 ÷ 16V, TA = 80°C (Max)
Vi = 4.5 ÷ 16V, TA = 85°C (Max)
1.95
1.85
1.75
1.65
1.55
1.45
Io
Output current
A
4/12
GS-R12F
Electrical characteristics
3
Electrical characteristics
T = 25°C, unless otherwise specified
A
Table 5.
Symbol
Electrical characteristics (all version)
Parameter Test condition
Ripple voltage Vi = 12V, Io = 2A
Min
Typ
Max
Unit
Vr
20
35
mVpp
mV/°C
A
Temperature stability
Output current
Vi = Vo + 1.5V, Io = 2A
Vi = 4.5 ÷ 16V
TBD
Io
IoL
Iq
0
2
Current limit
Vi = 4.5 ÷ 16V
2.5
1.8
A
Quiescent current
Vi = 12V, Io = 0A
2.5
100
mA
Total stand-by quiescent
current
Iqst-by
fs
Vinh > 2.2V
50
µA
kHz
V
Switching frequency
Reference voltage
Short circuit current
Vi = 12V, Io = 2A
225
250
275
Vi = 4.5 ÷ 15V
Iref = 0 ÷ 5mA
3.234 3.3
3.366
Vref
INH
8
10
30
mA
V
Device ON
0.8
INH threshold voltage
Device OFF
2.2
V
VFB
Feedback voltage
Vi = 4.5 ÷ 15V IO=0 ÷ 2A
1.22 1.235 1.25
TBD
V
SRV
Supply voltage rejection
mV/V
5/12
Application information
GS-R12F
4
Application information
4.1
Input voltage
The recommended maximum operating DC Input Voltage is 15V including ripple voltage.
4.2
4.3
Reference voltage
No capacitor is required for stability.
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 100µA for V = 15V.
i
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 V to disable the device.
i
4.4
4.5
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.
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.
6/12
GS-R12F
Application information
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 (150ºC 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-R12F0002.0 only)
The GS-R12F0002.0 output voltage is 5.54V ±4%, to reduce this value connect a resistor
between pin 11 (FB) and pin 10 (V ).
out
The resistor must be located very close to the proper pins, to minimize the injected noise
(see Figure 2).
The resistor value is calculated using the following formula:
Rv = [(V - 1.235) * 11.3] / 5.54 - V ) --[kΩ]
out
out
V
can be adjusted between 1.235V (Rv = 0 Ω) and 5.54V (Rv = open)
out
4.8
Loop compensation (GS-R12F0002.0 only)
If required by particular load conditions, it is possible to change the feedback loop
compensation, adding an external capacitor between pin 11 (FB) and pin 10 (V ), which
out
will act as speed up (see Figure 3).
7/12
Additional features and protections
GS-R12F
5
Additional features and protections
5.1
Output overvoltage protection
The overvoltage protection, OVP, is realized by using an internal comparator, whose input is
connected to the feedback. It turns off the power stage when the OVP threshold is reached.
This threshold is typically 30% higher than the feedback voltage.
Figure 2. Output voltage programming Figure 3. Loop compensation
Figure 4. Multiple units synchronization
8/12
GS-R12F
Additional features and protections
Figure 5. P.C.B. Footprint (dimensions in mm)
9/12
Ordering scheme
GS-R12F
6
Ordering scheme
Table 6.
Ordering information scheme
GS-
R12
F018
2.0
Input Voltage
12 = 12V
Output Voltage
018 = 1.8V
025 = 2.5V
033 = 3.3V
050 = 5.0V
000 = 1.235 ÷ 5.5V
Output Current
2.0 = 2A
10/12
GS-R12F
Revision history
7
Revision history
Table 7.
Date
16-Oct-2006
Revision history
Revision
Changes
1
Initial release
11/12
GS-R12F
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