GS-R24FV0001.8 [STMICROELECTRONICS]
2.3A SWITCHING REGULATOR, SMA10;
| 型号： | GS-R24FV0001.8 |
| 厂家： | 
ST |
| 描述： | 2.3A SWITCHING REGULATOR, SMA10 开关 |
| 文件： | 总15页 (文件大小：467K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R24FP
1.8 A DC-DC converter modules
Features
■ MTBF 1 000 000 hours (TA = 25
■ 1.8 A max output current
■ 35 V max input voltage
■ 1.5 V max drop-out voltage
■ Remote logic inhibit/enable
■ Synchronization
°C)
■ Not-latching overload and short circuit
protection
Packing type: V = vertical PTH
■ Thermal shutdown
■ Fixed or adjustable output
■ No heatsink required
■ Operating temperature range -25 °C ÷ 85 °C
Description
The GS-R24FP series is a family of high
efficiency step down switching voltage regulator,
designed to replace linear regulators.
Based on ST L5973A device, this non isolated
family of regulators are suitable for the full
spectrum of applications including telecom,
industry, computer and distributed power system
applications having a widely rging input
voltage.
Packing type: S = horizontal SMD
Table 1.
Device summary
Output voltage Input voltage
Output ripple Efficiency
Notes
Order codes
[V]
[V]
[mVpp]
[%]
GS-R24FP0181.8
GS-R24FP0251.8
GS-R24FP0331.8
GS-R24FP0501.8
GS-R24FP0001.8
1.8 ± 4%
2.5 ± 4%
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
25
30
30
40
40
59 - 63
66 - 70
70 - 75
79 - 83
56 - 83
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Progr. output voltage
3.3 ± 4%
5.0 ± 4%
1.235 ÷ 5.5%
February 2008
Rev 2
1/15
www.st.com
15
Contents
GS-R24FP
Contents
1
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
Pin connection and mechanical data (dimensions in mm) . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1
2.2
2.3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal de-rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Multiple units synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Output voltage programming (GS-R24FP0001.8 only) . . . . . . . . . . . . . . . 9
Loop compensation (GS-R24FP0001.8 only) . . . . . . . . . . . . . . . . . . . . . . 9
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1
Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
7
Ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
GS-R24FP
Pin settings
1
Pin settings
1.1
Pin connection and mechanical data (dimensions in mm)
Figure 1. Pin connection GS-R24FVxxx1.8
Figure 2. Pin connection GS-R24FSxxx1.8
3/15
Pin settings
GS-R24FP
1.2
Pin description
Table 2.
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
4
5
Sync
Vref
Master/slave synchronization
3.3 V reference voltage
DC input voltage
Input +
Input +
DC input voltage
Input/output
GND
6
7
Return for input/output voltage source
Return for input/output voltage source
Input/output
GND
8
9
Vout
Vout
Regulated power output
Regulated power output
Feedback input, available on adjustable device and on request for
additional compensation
10
FB
4/15
GS-R24FP
Maximum ratings
2
Maximum ratings
2.1
Absolute maximum ratings
Table 3.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
VI
Iout
V1
DC input voltage
36
V
Maximum output current
int. limit
-0.3 to Vi
-0.3 to 4
4
INH
Sync
FB
V
V
V
V2
V10
2.2
Thermal data
Table 4.
Symbol
Thermal data
Parameter
Storage temperature range
Operating ambient temperature
Value
Unit
TSTG
TOP
-40 ÷ 105
-25 ÷ 85
°C
°C
5/15
Maximum ratings
GS-R24FP
2.3
Thermal de-rating
Table 5.
Symbol
Thermal de-rating for free air condition (all versions)
Parameter
Test condition
Value
Unit
VI = 16 V, TA = 30 °C
VI = 16 V, TA = 40 °C
VI = 16 V, TA = 50 °C
VI = 16 V, TA = 55 °C
VI = 16 V, TA = 60 °C
VI = 16 V, TA = 65 °C
VI = 16 V, TA = 70 °C
VI = 16 V, TA = 75 °C
VI = 16 V, TA = 80 °C
VI = 16 V, TA = 85 °C
VI = 24 V, TA = 30 °C
VI = 24 V, TA = 40 °C
VI = 24 V, TA = 50 °C
VI = 24 V, TA = 55 °C
VI = 24 V, TA = 60 °C
VI = 24 V, TA = 65 °C
VI = 24 V, TA = 70 °C
VI = 24 V, TA = 75 °C
VI = 24 V, TA = 80 °C
VI = 24 V, TA = 85 °C
VI = 35 V, TA = 30 °C
VI = 35 V, TA = 40 °C
VI = 35 V, TA = 50 °C
VI = 35 V, TA = 55 °C
VI = 35 V, TA = 60 °C
VI = 35 V, TA = 65 °C
VI = 35 V , TA = 70 °C
VI = 35 V, TA = 75 °C
VI = 35 V, TA = 80 °C
VI = 35 V, TA = 85 °C
1.80
1.80
1.75
1.70
1.65
1.50
1.35
1.25
1.10
0.90
1.80
1.75
1.70
1.60
1.45
1.30
1.20
1.05
0.85
0.60
1.75
1.60
1.45
1.35
1.20
1.05
0.90
0.75
0.50
0.30
Io
Io
Io
Output current
A
A
A
Output c urrent
Output current
6/15
GS-R24FP
Electrical characteristics
3
Electrical characteristics
T = 25 °C, unless otherwise specified
A
Table 6.
Symbol
Electrical characteristics (all version)
Parameter Test condition
Vi =24 V Io = 1.8 A
Min
Typ
Max
Unit
Vr
Ripple voltage
30
60
mVpp
mV/°C
A
for GS-R24FPyyy1.8
Temperature stability
Output current
Vi =Vo + 1.5 V Io = 1.8 A
Vi =16 ÷ 35 V
for GS-R24FPyyy1.8
Io
0
1.8
IoL
Iq
Current limit
Vi =16 ÷ 35 V
2.3
80
A
Quiescent current
Vi =24 V Io = 0 A
2.7
mA
Total stand-by
quiescent current
Iqst-by
fs
Vinh > 2.2 V Vi = 35 V
150
µA
Switching frequency
Reference voltage
Short circuit current
Vi = 24 V Io = 1.8 A
500
3.3
10
kHz
V
Vi = 16 ÷ 35 V Iref = 0 ÷ 5 mA
3.2
8
3.399
30
Vref
mA
V
Device ON
0.8
INH
VFB
INH threshold voltage
Feedback voltage
Device OFF
2.2
V
Vi =16 ÷ 35 V IO = 0 ÷ 1.8 A
1.22 1.235 1.25
V
7/15
Application information
GS-R24FP
4
Application information
4.1
Input voltage
The recommended maximum operating DC input voltage is 35 V 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 2.2 V the device is disabled and the current consumption is
reduced to less than 150 µA for V = 35 V.
i
With INH pin lower than 0.8 V, 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 2 together (see Figure 6).
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 500 kHz, 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.
8/15
GS-R24FP
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 (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-R24FP0001.8 only)
The GS-R24FP0001.8 output voltage is 5.54 V ± 4 %, to reduce this value connect a resistor
between pin 10 (FB) and pin 9 (V ).
out
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:
for GS-R24FP0001.8 Rv = [(V - 1.235) * 11.3] / 5.54 - V ) --[kΩ]
out
out
V
can be adjusted between 1.235 V (Rv = 0 Ω) and 5.54V (Rv = open)
out
4.8
Loop compensation (GS-R24FP0001.8 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 (V ), which will
out
act as speed up (see Figure 5).
9/15
Application information
GS-R24FP
4.9
Soldering
Soldering phase has to be execute with care : in order to avoid undesired melting
phenomenon, particular attention has to be take on the set up of the peak temperature.
Here following some suggestions for the temperature profile based on
IPC/JEDEC J-STD-020C ,July 2004 recommendations.
Table 7.
Soldering
Profile feature
PB free assembly
Average ramp up rate ( TSMAX to TP)
3 °C / sec max
Preheat:
Temperature min ( TS MIN)
Temperature max ( TS MAX)
Time (TS MIN to TS MAX) ( tS )
150 °C
200 °C
60 – 100 sec
Time maintained above :
Temperature TL
217 °C
Time tL
40 – 70 sec
Peak temperature (TP)
240 + 0 °C
10 – 20 sec
6 °C / sec
Time within 5 °C of actual peak temperature (tP)
Ramp down rate
Time from 25 °C to peak temperature
8 minutes max
Figure 3.
Soldering
10/15
GS-R24FP
Additional features and protections
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 4. Output voltage programming Figure 5. Loop compensation
10
4, 5
4, 5
10
Rv
Rv
Cc
8, 9
8, 9
Vin
Vin
GS-RxxFp000z.z
GS-RxxFp000z.z
Vout
Rload
Vout
Rload
6, 7
6, 7
Figure 6. Multiple units synchronization
2
4, 5
2
4, 5
Rload
Rload
8, 9
8, 9
Vin
Vin
GS-RxxFpyyyz.z
GS-RxxFpyyyz.z
t
Vou
Vout
6, 7
6, 7
11/15
Additional features and protections
Figure 7. PCB footprint for GS-R24FSxxx1.8 (dimensions in mm)
GS-R24FP
12/15
GS-R24FP
Ordering scheme
6
Ordering scheme
Table 8.
Ordering information scheme
GS- R12
FV
018
1.8
Input voltage
24 = 24 V
Package
V = Vertical
S = SMD
Output voltage
018 = 1.8 V
025 = 2.5 V
033 = 3.3 V
050 = 5.0 V
000 = 1.235 ÷ 5.5 V
Output current
1.8 = 1.8 A
13/15
Revision history
GS-R24FP
7
Revision history
Table 9.
Date
Document revision history
Revision
Changes
13-Oct-2006
27-Feb-2008
1
2
Initial release
Added: Section 4.9: Soldering on page 10
14/15
GS-R24FP
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