STMicroelectronics GS-R24F0002.0 2 a dc-dc converter module Datasheet

GS-R24F
2 A DC-DC converter modules
Features
■
MTBF 1 000 000 hours (TA = 25°C)
■
2 A max output current
■
35 V max input voltage
■
1.5 V 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.
Table 1.
Device summary
Output voltage
Input voltage
Output ripple
Efficiency
[V]
[V]
[mVpp]
[%]
GS-R24F0182.0
1.8 ± 4%
16 ÷ 35
25
72
Fixed output voltage
GS-R24F0252.0
2.5 ± 4%
16 ÷ 35
25
76
Fixed output voltage
GS-R24F0332.0
3.3 ± 4%
16 ÷ 35
25
82
Fixed output voltage
GS-R24F0502.0
5.0 ± 4%
16 ÷ 35
25
85
Fixed output voltage
GS-R24F0002.0
1.235 ÷ 5.5
16 ÷ 35
25
68 ÷ 85
Progr. output voltage
GS-R24F1201.5
12 ± 4%
16 ÷ 35
100
91
Fixed output voltage
GS-R24F0001.0
3.3 ÷ 24
16 ÷ 35
100 ÷ 250
78 ÷ 96
Progr. output voltage
Order codes
February 2008
Rev 2
Notes
1/13
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13
Contents
GS-R24F
Contents
1
2
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3
Thermal de-rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
4.1
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2
Reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3
Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.4
Multiple units synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.5
Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.6
Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.7
Output voltage programming
(GS-R24F0002.0 and GS-R24F0001.0) 7
4.8
Loop compensation (GS-R24F0002.0 and GS-R24F0001.0) . . . . . . . . . . 7
4.9
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1
Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
GS-R24F
Pin settings
1
Pin settings
1.1
Pin connection
Figure 1.
1.2
Pin connection and mechanical data (dimensions in mm)
Pin description
Table 2.
Pin description
Name
Function
Description
1
INH
A logic high level disables the device. When the pin is open, an
internal pull up disables the device
2
Vref
3.3 V reference voltage
3
Input +
DC input voltage
4
Input +
DC input voltage
5
Input GND
Return for input voltage source
6
Input GND
Return for input voltage source
7
Output GND
Return for output voltage source
8
Output GND
Return for output voltage source
9
Vout
Regulated power output
10
Vout
Regulated power output
11
FB
Feedback input, available on adjustable device and on request for
additional compensation
12
Sync
Master/Slave synchronization
3/13
Maximum ratings
GS-R24F
2
Maximum ratings
2.1
Absolute maximum ratings
Table 3.
Absolute maximum ratings
Symbol
VI
IOUT
2.2
Parameter
DC input voltage
Maximum output current
36
V
internally limit
INH
-0.3 to VI
V
V12
Sync
-0.3 to 4
V
V11
FB
4
V
Value
Unit
Thermal data
Absolute maximum ratings
Symbol
Parameter
Tstg
Storage temperature range
-40 ÷ 105
°C
Top
Operating ambient temperature
-25 ÷ 85
°C
Test condition
Value
Unit
VI = 16 ÷ 35 V --------TA = 60 °C
1.95
VI = 16 ÷ 35 V---------TA = 65 °C
1.85
VI = 16 ÷ 35 V ---------TA = 70 °C
1.75
VI = 16 ÷ 35 V ---------TA = 75 °C
1.65
VI = 16 ÷ 35 V ---------TA = 80 °C
1.55
VI = 16 ÷ 35 V ------ --TA = 85 °C
1.40
Thermal de-rating
Table 5.
Symbol
Io
4/13
Unit
V1
Table 4.
2.3
Value
Thermal de-rating for free air condition (all versions)
Parameter
Output current
A
GS-R24F
3
Electrical characteristics
Electrical characteristics
TA = 25 °C, unless otherwise specified
Table 6.
Symbol
Electrical characteristics (all version)
Parameter
Test condition
Min
Typ
Max
Unit
25
35
mVpp
100
mVpp
250
mVpp
Vr
Ripple voltage
VI =24 V Io = 2A
for GS-R24Fyyy2.0
Vr
Ripple voltage
VI =24 V Io = 1.5 A
for GS-R24F1201.5
Vr
Ripple voltage
VI =24V Io = 1 A
for GS-R24F0001.0
Temperature stability
VI =Vo + 1.5 V Io = 2 A
Io
Output current
VI =16 ÷ 35 V
for GS-R24Fyyy2.0
0
2
A
Io
Output current
VI =16 ÷ 35 V
for GS-R24F1201.5
0
1.5
A
Io
Output current
VI =16 ÷ 35 V
for GS-R24F0001.0
0
1
A
IoL
Current limit
VI =16 ÷ 35 V
2.5
Iq
Quiescent current
VI =24 V Io = 0 A
1.8
2.5
mA
80
150
µA
225
250
275
kHz
3.234
3.3
3.366
V
8
10
30
mA
0.8
V
Iqst-by
fs
Vref
100
mV/°C
Total stand-by quiescent
Vinh>2.2 V Vi = 35 V
current
Switching frequency
VI = 24 V Io = 2 A
Reference voltage
VI = 16 ÷ 35 V Iref = 0 ÷ 5 mA
Short circuit current
Device ON
INH
VFB
A
INH threshold voltage
Feedback voltage
Device OFF
2.2
Vi=16 ÷ 35 V IO=0 ÷ 2 A
1.22
V
1.235
1.25
V
5/13
Application information
4
Application information
4.1
Input voltage
GS-R24F
The recommended maximum operating Dc input voltage is 35 V 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 2.2 V the device is disabled and the current consumption is
reduced to less than 150 µA for VI = 35 V.
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
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.
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 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
4.6
Application information
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 GSR24F0001.0)
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
(Vout).
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 = [(Vout - 1.235) * 11.3] / (5.54 - Vout) --[kΩ];
for GS-R24F0001.0 Rv = [(Vout - 1.235) * 62] / (24.44 - Vout) --[kΩ].
Vout can be adjusted between 1.235 V (Rv = 0 Ω) and 5.54 V/24.44 V (Rv = open).
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 (Vout), which
will act as speed up (see Figure 4).
7/13
Application information
4.9
GS-R24F
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
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
Time tL
217 °C
40 – 70 sec
Peak temperature (TP)
240 + 0 °C
Time within 5 °C of actual peak temperature (tP)
10 – 20 sec
Ramp down rate
Time from 25 °C to peak temperature
Figure 2.
8/13
PB free assembly
Soldering
6 °C / sec
8 minutes max
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 5.
Multiple units synchronization
Figure 4.
Loop compensation
9/13
Additional features and protections
Figure 6.
10/13
PCB footprint (dimensions in mm)
GS-R24F
GS-R24F
6
Ordering scheme
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
7
GS-R24F
Revision history
Table 9.
12/13
Document revision history
Date
Revision
Changes
13-Oct-2006
1
Initial release
27-Feb-2008
2
Added: Section 4.9: Soldering on page 8
GS-R24F
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