GS-R400V [STMICROELECTRONICS]
20W TO 140W STEP-DOWN SWITCHING REGULATOR FAMILY; 20W 140W的降压型开关稳压器系列
| 型号： | GS-R400V |
| 厂家： | 
ST |
| 描述： | 20W TO 140W STEP-DOWN SWITCHING REGULATOR FAMILY |
| 文件： | 总5页 (文件大小：117K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R400 Family
20W TO 140W STEP-DOWN
SWITCHING REGULATOR FAMILY
FEATURES
MTBF in excess of 200,000 hours
4A max output current
46V max input voltage
4V max drop-out voltage
Soft start
Remote logic inhibit/enable
Remote output voltage sense
Non-latching overload and short circuit protection
Crow-bar output overvoltage protection
DESCRIPTION
The GS-R400 series is a versatile family of high
current, high voltage step-down switching voltage
regulators.
The integral heatsink allows a large power handling
capability and it provides also an effective shielding
to minimize EMI.
SELECTION CHART
Regulation
Type
Ordering
Number
Output
Voltage
(V)
Input
Voltage
(V)
Output
Ripple
(mVpp)
Efficiency
(%)
Notes
Line
Load
(mV/A)
(mV/V)
GS-R405
GS-R412
GS-R415
GS-R424
GS-R405S
GS-R400V
Fixed output voltage
5.1 ± 2%
12.0 ± 4%
15.0 ± 4%
24.0 ± 4%
5.1 ± 2%
9 to 46
16 to 46
19 to 46
28 to 46
9 to 46
25
50
2
5
5
6
2
6
20
40
70
80
"
65
60
85
"
"
100
90
90
Reset output
Progr. output voltage
25
20
70
5.1 to 40 Vo+4 to 46
5.1 to 40 Vo+4 to 46
25 to 100
20 to 90
70 to 90
Progr. output voltage and
current. Frequency synchr.
GS-R400VB
25 to 100
6
20 to 90
70 to 90
Note: The line regulation is measured at I =1A
out
The load regulation is measured at V =V +8V and I =1 to 3A
in
o
out
For V ≥ 36V and I = 4A an external heatsink or forced ventilation are required.
O
o
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
48
Unit
V
DC Input Voltage
V
i
Reset Output Sink Current
Storage Temperature Range
I *
rt
20
mA
°C
T
stg
– 40 to +105
– 20 to +85
Operating Case Temperature Range
T
cop
°C
* GS-R405S only
June 1994
1/5
GS-R400 FAMILY
CONNECTION DIAGRAM AND MECHANICAL DATA
Pin 2
Pin 5,6,7 GS-R400VB only
Pin 12 GS-R400V/VB only
GS-R405S only
Bottom view
Dimensions in mm
PIN DESCRIPTION
Pin
1
Function
Inhibit
Description
The module is disabled by a high logic level applied to this pin.
Reset output (GS-R405S only).
Reset
2
+ Input
DC input voltage. Recommended maximum voltage is 46V.
Return for input voltage source.
3
Input GND
4
100kHz oscillator output. To be connected to Sync (pin 6) input if the unit is a master and
left open if it is a slave (GS-R400VB only). See fig. 5.
Oscillator
Sync
5
6
Synchronization input. To be connected to the Oscillator output (pin 5) of the master (GS-
R400VB only). See fig. 5.
Current limiting
Output GND
– Sense
A resistor (≥ 2.2kΩ) connected from this pin to pin 9 sets the current limiting level
7
8
(GS-R400VB only).
Return for output current path.
Internally connected to pin 4.
Senses the remote load return. Must be tied to pin 8 when the remote sensing feature is
not used. See fig. 1.
9
+ Sense
Senses the remote load high side. Must be tied to pin 11 when the remote load sensing
feature is not used. See fig. 1.
10
+ Output
Program
Regulated DC output voltage.
11
12
A resistor (≤ 18kΩ) connected between this pin and pin 10 sets the output voltage
(GS-R400V and GS-R400VB only).
2/5
GS-R400 FAMILY
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise specified)
Symbol
Parameter
Temperature Stability
Output Current
Test Conditions
V = V +8V I = 1A
Min
Typ
Max
Unit
mv/°C
A
∆V /∆T
0.2/1.6
i
o
o
o
V = V +8V
I
o
i
o
0.2
4
8
Current Limit
V = V +8V
i o
I
oL
5
A
Average Input Current
Switching Frequency
Supply Voltage Rejection
Ripple Voltage
V = 46V Output Shorted
i
I
0.1
0.2
A
isc
I = 1A
o
f
s
100
KHz
mV/V
f = 100Hz Io =1A
o
SVR
4/12
25/150
10/35
I = 2A
o
V
r
mV
pp
Soft Start Time
V = V +8V
t
ms
V
i
o
ss
Low Inhibit Voltage
High Inhibit Voltage
High Inhibit Input Current
Crow-bar Delay Time
Reset High Level
V
0.8
5.5
inhl
V
I
2
V
inhh
V
inh
= 5V
500
µA
µs
V
inhh
t
5
5
cb
V
*
rh
I = 5mA
rl
I = 10mA
rl
0.2
0.4
Reset Low Level
V *
rl
V
Reset Delay Time
t
*
100
ms
V
rd
Crowbar Intervention Threshold
V
V •1.25
o
cth
Total Remote
Sense Compensation
∆V
500
mV
o
Thermal Resistance
Case to ambient
R
5
°C/W
th
* GS-R405S only
USER NOTES
Input Voltage
Thermal Characteristics
The case-to-ambient thermal resistance of all the
GS-R400 modules is about 5°C/W. This produces
a 50°C temperature increase of the module surface
for 10W of internal power dissipation.
The recommended operating maximum DC input
voltage is 46V inclusive of the ripple voltage.
Depending on the ambient temperature and/or on
the power dissipation, an additional heatsink or
forced ventilation may be required.
Remote Sensing
The remote voltage sense compensation range is
for a total drop of 500mV equally shared between
the load connecting wires. It is a good practice to
shield the sensing wires to avoid oscillation.
Each sense input must be connected to its compan-
ion output power pin when the remote sense capa-
bility is not used (see fig. 1).
Input Impedance
The module has an internal capacitor connected
between the input pins in order to assure PWM
stability. This capacitor cannot handle large values
of high frequency ripple current and it can be per-
manently damaged if the primary energy source
impedance is not adequate. The use of an external
low ESR, high ripple current capacitor located as
close the module as possible is recommended.
Suitable capacitors should have a RMS current
Case Grounding
The module case is isolated from the electrical
circuit of the switching regulator. It can be grounded
using the 4 corner pins.
The PCB area below the module can be used as an
effective sixth side shield against EMI.
capability of 2.5A
with a working voltage of 50
and an ESR of 0,1Ω at 100 kHz. When space
RMS
V
DC
3/5
GS-R400 FAMILY
is a limitation, a 22µF ceramic multilayer capacitor
must be connected to the module input pins.
The value of the resistor is calculated by using the
following formula:
Output Voltage Programming
R = [2.2 + (5•I )] kΩ
i
o
The GS-R400V and GS-R400VB output voltage is
programmed by using a resistor (see pin function
table and fig. 4). The resistor must be located very
close the module and the PCB layout must
mimimize injected noise. The value of the resistor
is calculated by using the following formula:
Module Protection
The modules are protected against occasional and
permanent short circuits of the output pin to ground,
as well as against output current overload.
When the output current exceeds the maximum
value, the output is automatically disabled. After a
fixed time the module starts again in a soft mode.
The cycle is repeated until the overload condition is
removed.
V
o
R = 2.67
v
–1 kΩ
5.1
Acrowbar output overvoltage protection is activated
whenever the output voltage exceeds the nominal
output voltage by more than 25%.
V can be adjusted between 5.1 and 40V.
o
Current Limiting Programming
The GS-R400VB current limiting is programmed by
using a resistor (see pin function table and fig. 4).
Figure 1. Load Connection
Figure 2. Remote Inhibit Operation
4/5
Figure 3. Reset Operation
GS-R400 FAMILY
Figure 4. Voltage and Current Programming
Figure 5. Multiple Units Synchronization
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 ascritical 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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