GS-R51212S [STMICROELECTRONICS]
31WTRIPLE OUTPUT STEP-DOWN SWITCHING REGULATORS; 31WTRIPLE输出，降压型开关稳压器
| 型号： | GS-R51212S |
| 厂家： | 
ST |
| 描述： | 31WTRIPLE OUTPUT STEP-DOWN SWITCHING REGULATORS |
| 文件： | 总8页 (文件大小：90K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R51212S
GS-R51515S
31W TRIPLE OUTPUT STEP-DOWN SWITCHING REGULATORS
Type
V
V
I
o
i
o
+ 5,1 V
± 12 V
+ 5,1 V
± 15 V
4,5 A
0,35 A
4,5 A
0,3 A
GS-R51212S
15 to 40 V
15 to 40 V
GS-R51515S
FEATURES
5.1V/4.5A and ±12V/0.35A or ±15V/0.3A output
voltages
±12 or ±15V externally adjustable
High efficiency (81% typ.)
Short-circuit protection
Reset output
Power Fail programmable input
Inhibit/Enable control input
Soft-start
PCB or chassis mounting
DESCRIPTION
The GS-R51212S and GS-R51515S are versatile
triple output, high current step-down switching
regulators that provide +5.1V/4.5A output voltage
and an isolated ±12V/0.35A or ±15V/0.3A dual
output voltage.
They are ideal for microprocessor based boards
because power the logic and the communication
ports and have Reset output and Power Fail pro-
grammable input for the correct system start-up.
The Inhibit/Enable pin allows the ON/OFF logic
function with TTL/CMOS compatible input signal.
The auxiliary outputs(±12V or ±15V) are externally
adjustablein a very wide range, i.e. from ±4.25V to
±12.45V on GS-R51212S and from ±4.50V to
±15.25V (typical values) on GS-R51515S.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
44
Unit
V
V
DC Input Voltage
i
I
rs
Reset Output Sink Current
20
mA
June 1994
1/8
GS-R51212S/GS-R51515S
ELECTRICAL CHARACTERISTICS (Tamb = 25°C unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Symbol
V
Input Voltage
GS-R51212S
V
V
V
= +5.1V
= +12V
= – 12V
I
I
I
= 4.5A
= 0.35A
= – 0.35A
15
40
V
i
o1
o2
o3
o1
o2
o3
V
Input Voltage
GS-R51515S
V
V
V
= +5.1V
= +15V
= – 15V
= 4.5A
= 0.3A
= – 0.3A
15
40
V
i
o1
o2
o3
Io1
I
I
o2
o3
l
Input Reflected Current
Input Reflected Current
V = 24V
I
= Full Load
0.5
App
App
ir
i
o1,2,3
No external input capacitor
l
ir
V = 24V = Full Load
I
0.15
i
o1,2,3
Ci (external) = 100µF/50V
V
Enable Input Voltage
Enable Input Current
Inhibit Input Voltage
Output Voltage 1
V = 15 to 40V
0
0.8
– 1
V
mA
V
ien
i
l
V = 15 to 40V
i
ien
V
V = 15 to 40V
i
1.2
+5
+Vi
+5.2
iinh
V
V = 15 to 40V
I
= 0 to 4.5A
+5.1
V
o1
i
o1
= 0 to 0.35/0.3A
= 0 to – 0.35/– 0.3A
I
I
o2
o3
V
Output Voltage 2
GS-R51212S
V = 15 to 40V
o2
I
I
= 0 to 4.5A
+11.5
+14.5
– 11.5
– 14.5
+12
+15
– 12
– 15
30
+12.5
+15.5
– 12.5
– 15.5
50
V
V
o2
o2
o3
o3
or1
i
o1
o3
I
= 0 to 0.35A
= 0 to – 0.35A
Output Voltage 2
GS-R51515S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0 to – 0.3A
V
V
V
i
o1
o3
I
= 0 to 0.3A
o2
Output Voltage 3
GS-R51212S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0 to – 0.35A
V
i
o1
o3
I
= 0 to 0.35A
o2
Output Voltage 3
GS-R51515S
V = 15 to 40V
I
= 0 to 4.5A
= 0 to – 0.3A
V
i
o1
I
= 0 to 0.3A
o2
Io3
V
Output Ripple
Voltage 1
V = 24V
i
I
I
I
= 4.5A
mVpp
mVpp
mV/V
mV/V
mV/A
mV/A
A
o1
V
Output Ripple
Voltage 2,3
V = 24V
i
= 0.35/0.3A
50
100
or2,3
o2,3
δV
OL1
Line Regulation 1
Line Regulation 2,3
Load Regulation 1
Load Regulation 2,3
Output Current 1
V = 15 to 40V
= 2.5A
o1
0.5
1
i
I
= 0.35/0.3A
o2,3
δV
V = 15 to 40V
= 2.5A
Io1
OL2,3
i
I
= 0.35/0.3A
o2,3
δV
V = 24V
I
= 0.5 to 4.5A
2
OO1
i
o1
o1
I
= 0.35/0.3A
o2,3
δV
V = 24V
I
= 2.5A
500
OO2,3
i
I
I
= 0.05 to 0.35/0.3A
o2, o3
I
I
I
I
V = 15 to 40V
V
= 5.1V
0
0
0
0
0
0
4.5
0.35
0.3
o1
o2
o2
o2
i
o1
I
= 0 to 0.35/0.3A
o2,3
Output Current 2*
GS-R51212S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0 to – 0.35A
A
i
o1
o3
V
= +12V
o2
Output Current 2*
GS-R51515S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0 to – 0.3A
A
i
o1
o3
V
= +15V
o2
Output Current 2*
GS-R51212S
V = 15 to 40V
= 0 to 4.5A
= 0A
0.7
A
i
Io1
I
V
= +12V
o2
o3
Io2
Io3
Output Current 2*
GS-R51515S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0A
0.6
A
i
o1
o3
V
= +15V
o2
Output Current 3*
GS-R51212S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0 to 0.35A
– 0.35
A
i
o1
o2
V
= – 12V
o3
2/8
GS-R51212S/GS-R51515S
ELECTRICAL CHARACTERISTICS (Tamb = 25°C unless otherwise specified) (cont’d)
Parameter
Test Conditions
Min
Typ
Max
Unit
Symbol
I
I
I
Output Current 3*
GS-R51515S
V = 15 to 40V
o3
I
I
= 0 to 4.5A
= 0 to 0.3A
0
– 0.3
A
o3
o3
o3
i
o1
o2
V
= – 15V
Output Current 3*
GS-R51212S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0A
0
0
– 0.7
– 0.6
A
A
A
A
A
i
o1
o2
V
= – 12V
o3
Output Current 3*
GS-R51515S
V = 15 to 40V
I
I
= 0 to 4.5A
= 0A
i
o1
o2
V
= – 15V
o3
I
Output Current
Limit 1
V = 15 to 40V
i
Overload
5.5
3
osck1
I
Output Short-circuit
Current 1
V = 15 to 40V
i
osc1
I
Output Short-circuit
Current 2,3
V = 15 to 40V
i
0.8
osc2,3
t
Soft-start time
10
ms
ms
ss
t
Reset Time Delay
Switching Frequency
100
100
dr
f
V = 15 to 40V
V
V
= 5.1V
kHz
s
i
o1
o3
I
= 0.5 to 4.5A
o1
V
= +12/+15V
= – 12/– 15V
o2
I
, I = – 0.05 to – 0.35/– 0.3A
o2 o3
η
Efficiency
V = 24V
i
I
= Full Load
o1,2,3
78
81
%
°C/W
°C
R
Thermal Resistance
7.5
th
T
Operating Case
Temperature Range
0
+85
cop
T
Storage
Temperature Range
– 40
+105
°C
stg
* Note: when output current is less than 50mA, outputripple voltage increases due to discontinuous operation.
3/8
GS-R51212S/GS-R51515S
CONNECTION DIAGRAM AND MECHANICAL DATA
Package R. Dimensions in mm (inches).
PIN DESCRIPTION
Pin
Function
GND IN
Description
1
Return for input voltage source. Internally connected to pin 7.
Inhibit/Enable control input. The converter is ON (ENABLE) when the voltage applied to
this pin is lower than 0.8V. The converter is OFF (INHIBIT) when this pin is unconnected or
the input voltage is in the range of 1.2 to Vi.
2
EN.
Power Fail programmable input. If unconnected the Power Fail threshold voltage is 11V
with 1V hysteresis (factory setting).
3
4
5
P.F.
+ Vin
RT
DC input voltage. Recommended maximum voltage is 40V.
Reset output (active high). When the supply voltage +Vin and the regulated output voltage
+Vo1 are in the correct range this signal is generated after a delay time of 100ms typical.
6
7
Vo + 5V
Regulated +5.1V output voltage.
GND 1
Return for output 1 current path. Internally connected to pin 1.
Regulated +12 or +15V output.
8
Vo + 12/15V
Vo – 12/15V
ADJ.
9
Regulated – 12 or – 15V output.
10
11
External adjustment for output voltages ±12 and ±15V.
Return for ±12 and ±15V output current path.
GND Aux.
4/8
GS-R51212S/GS-R51515S
USER NOTES
Input Voltage
Reset output has internal pull-up resistor of
10kOhm connected to Vo +5V pin.
Maximum sink output current is 20mA at
The recommended operating maximum DC input
voltage is 40V inclusive of the ripple voltage. The
use of an external low ESR, high ripple current
capacitor located as close the module as possible
is recommended; suggested value is 100µF/50V.
V
= 200mV.
RESET(sat)
Fig. 1 and fig. 2 show reset waveforms.
Power Fail Programmable Input
This pin is internally connected via a divider to the
+Vin pin for Power Fail function.
The factory setting is for a value of 11V with 1V
hysteresis.
It is possible to program a different value of Power
Fail threshold by connecting a resistor (Rpf) be-
tween pin 3 (Power Fail Input) and pin 1 (GND
Input). The value of Rpf must be calculated accord-
ing to the following formula:
Soft-start
To avoid heavy inrush current the output voltage
rise time is typically 10ms in any condition of load.
Power Fail-Reset Circuit
The module include a voltage sensing circuit that
may be used to generate a power-on/power-off
reset signal for a microprocessor system.
The circuit sense the input supply voltage and the
output generatedvoltage Vo1 (+5V) and will gener-
ate the required reset signal only when both the
sensed voltages have reached the required value
for correct systemoperation.
5.1
− 5.1
R
=
= (kΩ)
pf
V
pf
− 0.191
34
When both the supply voltage and the regulated
where Vpf is the desired value of Power Fail thresh-
old voltage.
Exampe: Vpf = 24V (must not be lower than 12V):
voltage are in the correct range the output Reset
signal is generatedafter a delay time t of 100ms
DR
typical.
A latch assures that if a spike is present on the
sensed voltage the delay time circuit discharges
completelybefore initialization of a new reset cycle.
5.1
24 − 5.1
R
pf
=
= 14kΩ
− 0.191
34
Figure 1 - Reset and Power Fail waveforms.
5/8
GS-R51212S/GS-R51515S
Figure 2 - Reset and Power Fail waveforms.
Auxiliary Outputs
where V is the desired dual output voltage.
o
Example: V = ±5V.
o
The auxiliary outputs (±12V or ±15V) are externally
adjustable in symmetric way by connecting a
resistor Ra between pin 10 (ADJ.) and pin 8
(Vo + 12/+15V),according to the followingformula:
Ra (GS−R51212S) = 3.36kΩ
Ra (GS−R51515S) = 2.3kΩ
Example: V = ±10V.
o
Vo − 4.229
12.485 − Vo
GS−R51212S
GS−R51515S
Ra = 32.66 ×
Ra = 38.66 ×
Ra (GS−R51212S) = 75.8kΩ
Ra (GS−R51515S) = 41.3kΩ
Vo − 4.39
15.252 − Vo
6/8
GS-R51212S/GS-R51515S
Figure 3 - Typical Application.
Inhibit/Enable Input
Thermal characteristics
The Inhibit/Enable function allows the ON/OFF
logic control of the module.
The converter is ON (Enable) when the voltage
applied to pin 2 (EN.) and referred to pin 1 (GND
IN) is lower than 0.8V (TTL, CMOS, open collector
compatible level).
The converter is OFF (Inhibit) when pin 2 is uncon-
nected or the voltage appliedis in the range of 1.2V
to +Vin. Maximum sinking current is 1mA.
Sometimes theGS-R51212S and GS-R51515Sre-
quire an external heat-sink depending on both op-
erating temperature conditions and power.
Before entering into calculations details, some ba-
sic concepts will be explained to better understand
the problem.
The thermal resistance between two points is rep-
resented by their temperature difference in front of
a specified dissipated power, and it is expressed in
Degree Centigrade per Watt (°C/W).
Module Protection
For the modules the thermal resistance case to
ambient is 7.5°C/W. This means that an internal
power dissipationof1Wwillbring thecase tempera-
ture at 7.5°C above the ambient temperature.
The maximum case temperature is 85°C.
Let’s suppose to have a GS-R51515S that delivers
the maximum output power of 31.4W at an ambient
temperature of 40°C.
The module is protected against occasional and
permanent short-circuits of the output pins to
ground, as well as against output current overload.
The main output (+5.1V) uses a foldback current
limiting; the output current decreases with increas-
ing overload, reaching a minimum at short-circuit
condition.
This solution minimizes internal power dissipation.
The auxiliary outputs(±12V or ±15V) use a current
limiting protection circuitry.
7/8
GS-R51212S/GS-R51515S
The dissipated power in this operating condition is
about 7.4W (at typical efficiency of 81%), and the
case temperature of the module will be:
This value is the resulting value of the parallel
connection of GS-R thermal resistance and of the
additionalheatsink thermal resistance.
T
case = Tamb + Pd × R = 40 + 7.4 × 7.5 = 95.5 °C
Rth (GSR) × R (Heatsink)
Rth (GSR) + Rth (Heatsink)
th
th
= 5.40°C / W
This value exceedsthemaximum allowedtempera-
ture and an external heat-sink must be added. To
this purpose four holes (see mechanical drawing)
are provided on the metal surface of the module.
To calculate this heat-sink, let’s first determinewhat
the total thermal resistance should be:
To calculate the thermalresistance of the additional
heat-sink the following equation may be used:
5.40 × Rth (GSR) 5.40× 7.5
= 19.3 °C / W
Rth (Heatsink) =
=
Rth(GSR) − 5,40
7.5 − 5.40
Tcase(max) − Tamb
85 − 40
7.4
R
th
=
=
= 5.40 °C ⁄ W
In instead of or in addition to the external heatsink,
a forced ventilation with an air speed of about 200
linear feet/minute can be usedreducing the thermal
resistance of the module at the specified value.
Pd
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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8/8
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