GS-R24F_08 [STMICROELECTRONICS]
2 A DC-DC converter modules; 2所述的DC-DC转换器模块
| 型号： | GS-R24F_08 |
| 厂家： | 
ST |
| 描述： | 2 A DC-DC converter modules |
| 文件： | 总13页 (文件大小：370K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R24F
2 A DC-DC converter modules
Features
■ MTBF 1 000 000 hours (TA = 25
■ 2 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
■ 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.
Table 1.
Device summary
Output voltage Input voltage
Output ripple Efficiency
Notes
Order codes
[V]
[V]
[mVpp]
[%]
GS-R24F0182.0
GS-R24F0252.0
GS-R24F0332.0
GS-R24F0502.0
GS-R24F0002.0
GS-R24F1201.5
GS-R24F0001.0
1.8 ± 4%
2.5 ± 4%
3.3 ± 4%
5.0 ± 4%
1.235 ÷ 5.5
12 ± 4%
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
16 ÷ 35
25
25
72
76
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Progr. output voltage
Fixed output voltage
Progr. output voltage
25
82
25
85
25
68 ÷ 85
91
100
3.3 ÷ 24
100 ÷ 250
78 ÷ 96
February 2008
Rev 2
1/13
www.st.com
13
Contents
GS-R24F
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
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Multiple units synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Output voltage programming
(GS-R24F0002.0 and GS-R24F0001.0) 7
4.8
4.9
Loop compensation (GS-R24F0002.0 and GS-R24F0001.0) . . . . . . . . . . 7
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5
Additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1
Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
7
Ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
GS-R24F
Pin settings
1
Pin settings
1.1
Pin connection
Figure 1. Pin connection and mechanical data (dimensions in mm)
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
Vref
Input +
3.3 V 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
3/13
Maximum ratings
GS-R24F
2
Maximum ratings
2.1
Absolute maximum ratings
Table 3.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
VI
IOUT
V1
DC input voltage
36
internally limit
-0.3 to VI
-0.3 to 4
4
V
Maximum output current
INH
Sync
FB
V
V
V
V12
V11
2.2
2.3
Thermal data
Table 4.
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 5.
Symbol
Thermal de-rating for free air condition (all versions)
Parameter
Test condition
Value
Unit
VI = 16 ÷ 35 V --------TA = 60 °C
VI = 16 ÷ 35 V---------TA = 65 °C
VI = 16 ÷ 35 V ---------TA = 70 °C
VI = 16 ÷ 35 V ---------TA = 75 °C
VI = 16 ÷ 35 V ---------TA = 80 °C
VI = 16 ÷ 35 V ------ --TA = 85 °C
1.95
1.85
1.75
1.65
1.55
1.40
Io
Output current
A
4/13
GS-R24F
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 = 2A
Min
Typ
Max
Unit
Vr
Vr
Vr
Ripple voltage
25
35
mVpp
for GS-R24Fyyy2.0
VI =24 V Io = 1.5 A
for GS-R24F1201.5
Ripple voltage
100
250
mVpp
VI =24V Io = 1 A
for GS-R24F0001.0
Ripple voltage
100
mVpp
mV/°C
A
Temperature stability
Output current
VI =Vo + 1.5 V Io = 2 A
VI =16 ÷ 35 V
for GS-R24Fyyy2.0
Io
Io
Io
0
0
0
2
1.5
1
VI =16 ÷ 35 V
for GS-R24F1201.5
Output current
Output current
A
A
VI =16 ÷ 35 V
for GS-R24F0001.0
IoL
Iq
Current limit
VI =16 ÷ 35 V
2.5
1.8
A
Quiescent current
VI =24 V Io = 0 A
2.5
mA
Total stand-by quiescent
current
Iqst-by
fs
V
inh>2.2 V Vi = 35 V
80
150
µA
Switching frequency
Reference voltage
Short circuit current
VI = 24 V Io = 2 A
225
250
275
3.366
30
kHz
V
VI = 16 ÷ 35 V Iref = 0 ÷ 5 mA
3.234 3.3
Vref
8
10
mA
V
Device ON
0.8
INH
VFB
INH threshold voltage
Feedback voltage
Device OFF
2.2
V
Vi=16 ÷ 35 V IO=0 ÷ 2 A
1.22 1.235 1.25
V
5/13
Application information
GS-R24F
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 VI to disable the device.
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 5).
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 250 Hz, 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.
6/13
GS-R24F
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-R24F0002.0 and GS-
R24F0001.0)
The GS-R24F0002.0 output voltage is 5.54 V 4 %, the GS-R24F0001.0 output voltage is
24.44 V 4 %, to reduce these values 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:
for GS-R24F0002.0 Rv = [(V - 1.235) * 11.3] / (5.54 - V ) --[kΩ];
out
out
for GS-R24F0001.0 Rv = [(V - 1.235) * 62] / (24.44 - V ) --[kΩ].
out
out
V
can be adjusted between 1.235 V (Rv = 0 Ω) and 5.54 V/24.44 V (Rv = open).
out
4.8
Loop compensation (GS-R24F0002.0 and GS-R24F0001.0)
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 4).
7/13
Application information
GS-R24F
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 2.
Soldering
8/13
GS-R24F
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 3. Output voltage programming Figure 4. Loop compensation
Figure 5. Multiple units synchronization
9/13
Additional features and protections
Figure 6. PCB footprint (dimensions in mm)
GS-R24F
10/13
GS-R24F
Ordering scheme
6
Ordering scheme
Table 8.
Ordering information scheme
GS-
R24
F018
2.0
Input voltage
24 = 24 V
Output voltage
018 = 1.8 V
025 = 2.5 V
033 = 3.3 V
050 = 5.0 V
120 = 12 V
000 = 1.235 ÷ 5.5 V / 3.3 ÷ 24 V
Output current
2.0 = 2 A
1.5 = 1.5 A
1.0 = 1 A
11/13
Revision history
GS-R24F
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 8
12/13
GS-R24F
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