GS-R12H0502 [STMICROELECTRONICS]
SWITCHING REGULATOR, 275kHz SWITCHING FREQ-MAX, PDIP18;
| 型号： | GS-R12H0502 |
| 厂家： | 
ST |
| 描述： | SWITCHING REGULATOR, 275kHz SWITCHING FREQ-MAX, PDIP18 开关 光电二极管 |
| 文件： | 总8页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GS-R12HXXX2
2.5W TO 24W STEP-DOWN SWITCHING REGULATOR FAMILY
PRELIMINARY
FEATURE
■ MTBF 1 000 000 hours (
T =25 C)
amb
■ 2A max output current
■ 35V max input voltage
■ 1.5V max drop-out voltage
■ 3.3V ± 2% reference voltage
■ Remote logic inhibit/enable
■ Synchronization
■ Not-latching overload and short circuit
protection
■ Thermal shutdown
■ Fixed or adjustable output
■ No heatsink required
ORDERING NUMBER: GS-R12HXXX2
DESCRIPTION
The GS-R12HXXX2 series is a family of high efficiency step down switching voltage regulator, designed to re-
place linear regulators.
Based on STM L5973 device, this non isolated family of regulators are suitable for the full spectrum of applica-
tions including telecom, industry, computer and distributed power system applications having a widely ranging
input voltage.
SELECTION CHART
Type
Ordering
Number
Output
Voltage
[V]
Input
Voltage
[V]
Output
Ripple
[mVpp]
Efficiency
[%]
Notes
GS-R12H0122
GS-R12H0182
GS-R12H0252
GS-R12H0332
GS-R12H0502
GS-R12H0002
GS-R24H0332
20
20
20
20
20
20
20
68
72
76
82
85
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Fixed output voltage
Progr. output voltage
Fixed output voltage
1.235 ± 3%
1.8 ± 4%
2.5 ± 4%
3.3 ± 4%
5.0 ± 4%
1.235 ÷ 5.0
3.3 ± 4%
4.5 ÷ 15
4.5 ÷ 15
4.5 ÷ 15
4.5 ÷ 15
6.6 ÷ 15
4.5 ÷ 15
16 ÷ 35
68 ÷ 85
82
October 2003
1/8
This is preliminary information on a new product now in development. Details are subject to change without notice.
GS-R12HXXX2
Type
Ordering
Number
Output
Voltage
[V]
Input
Voltage
[V]
Output
Ripple
[mVpp]
Efficiency
[%]
Notes
GS-R24H0502
GS-R24H1201.5
GS-R24H0001
20
100
85
91
Fixed output voltage
Fixed output voltage
Progr. output voltage
5.0 ± 4%
12 ± 4%
3.3 ÷ 24
16 ÷ 35
16 ÷ 35
16 ÷ 35
100 ÷ 250
78 ÷ 96
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
DC Input Voltage (for GS-R12HXXX2)
16
36
Vi
DC Input Voltage (for GS-R24HXXX)
V
I
Maximum Output Current
int. limit
out
V
INH
-0.3 to V
V
V
9
i
V
V
T
Sync
-0.3 to 4
4
10
FB
V
11
Storage Temperature Range
Operating Ambient Temperature
°C
°C
°C
-40 ÷ 105
-25 ÷ 70
-25 ÷ 85
stg
T
op
T
op1
Operating Ambient Temperature with current derating
2/8
GS-R12HXXX2
CONNECTION DIAGRAM AND MECHANICAL DATA
PIN DESCRIPTION
Pin
1
Function
Input GND
Input GND
Input GND
Input +
Description
Return for input voltage source
Return for input voltage source
Return for input voltage source
DC input voltage
2
3
4
5
Input +
DC input voltage
6
Input +
DC input voltage
7
Input +
DC input voltage
8
V
ref
3.3V reference voltage
9
INH
A logical level (active high) disables the device, when it is open an internal pull
up disables the device
10
11
12
13
Sync
FB
Master/Slave synchronization
Feedback input, available on adjustable device
Regulated output
V
out
out
V
Regulated output
3/8
GS-R12HXXX2
Pin
14
15
16
17
18
Function
Description
V
Regulated output
out
out
V
Regulated output
Output GND
Output GND
Output GND
Return for output voltage
Return for output voltage
Return for output voltage
ELECTRICAL CHARACTERISTICS All versions (T =25 C, unless otherwise specified.)
amb
Symbol
Parameter
Temperature Stability
Current Limit
Test Condition
Min.
Typ.
Max.
Unit
mV/°C
A
V =V + 1.5V I = 2A
i
o
o
I
oL
2.5
1.8
50
V =4.5 ÷ 15V
i
I
q
Quiescent Current
V =12V I = 0A
2.5
mA
i
o
I
Total Stand-by Quiescent
Current
V
inh
>2.2V
100
µA
qst-by
f
Switching Frequency
Reference Voltage
V =12V I = 1.5A
225
3.234
8
250
3.3
10
275
kHz
V
s
i
o
3.366
V =4.5 ÷ 15V I =0 ÷ 5mA
i
ref
V
ref
Short Circuit Current
30
mA
V
INH
INH Threshold Voltage
Device ON
0.8
Device OFF
2.2
V
V
FB
Feedback voltage
1.22
1.235
1.25
V
V =4.5 ÷ 15V I = 0÷2A
i
o
SRV
Supply Voltage Rejection
Thermal Resistance
mV/V
R
th
Case to ambient
°C/W
ELECTRICAL CHARACTERISTICS for GS-R12HXXX2 only (T =25 C, unless otherwise specified.)
amb
Symbol
Parameter
Output Current
Ripple Voltage
Test Condition
Min.
Typ.
Max.
Unit
I
0
2
A
V =4.5 ÷ 15V
o
i
V
r
V =12V I = 2A
20
mVpp
i
o
4/8
GS-R12HXXX2
ELECTRICAL CHARACTERISTICS for GS-R24HXXX only (T =25 C, unless otherwise specified.)
amb
Symbol
Parameter
Output Current
Test Condition
Min.
Typ.
Max.
Unit
I
0
2
A
V =16 ÷ 35V for GS-R24H0332
o
i
---------------------GS-R24H0502
I
Output Current
Output Current
Ripple Voltage
0
0
1.5
1-2
A
A
V =16 ÷ 35V for GS-R24H1201.5
o
i
I
V =16 ÷ 35V for GS-RH0001
i
o
V
V =24V I = 2A for GS-R24H0332
20
mVpp
r
i
o
--------------------- -GS-R24H0502
V
V
Ripple Voltage
Ripple Voltage
V =24V I = 2A for GS-R24H1201.5
100
mVpp
mVpp
r
i
o
V =24V I = 2A for GS-R24H0001
100-
250
r
i
o
USER NOTES
Input Voltage
The recommended operating maximum DC Input Voltage is 15V inclusive of ripple voltage.
Reference voltage
No capacitor is required for stability.
Inhibit function
The inhibit feature allows to put in stand-by mode the device.
With INH pin 9 higher than 2.2V the device is disabled and the power consumption is reduced to less than
100µA.
With INH pin lower than 0.8V, 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 is also V compatible.
cc
Multiple units synchronization
Using more than one unit on the same circuit, it is possible to synchronize the switching frequency, connecting
all pin 10 together (see figure 3).
The unit with higher frequency becomes the master.
Current protection
The device has two current limit protections, pulse by pulse and frequency fold back.
The current is sensed through a resistor and if 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 suf-
ficiently low duty cycle at 250 Hz, the output current, in strong overcurrent or short circuit conditions, could in-
crease again.
For this reason the switching frequency is also reduced, so keeping the inductor current under its maximum
threshold.
5/8
GS-R12HXXX2
The frequency depends on the feedback voltage.
As the feedback voltage decreases (due to the reduced duty cycle), the switching frequency decrease too.
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 ºC).
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 20ºC avoids that the devices turns on and off continuously.
Thermal Characteristics
Output voltage programming (GS-R12H0002 only)
The GS-R12H0002 output voltage is 5.05V ±4%, to reduce this value connect a resistor between pin 11 (FB)
and pin 12 (V ).
out
The resistor must be located very close to the proper pins, to minimize the injected noise (see figure 1).
The resistor value is calculated using the following formula:
Rv=[(V -1.235)*10.2]/(5.05-V ) --[kOhm]
out
out
V
out
can be adjusted between 1.235V (Rv=0 Ohm) and 5.05V (Rv=open)
Loop compensation (GS-R12H0002 only)
If required by particular load conditions, it is possible to change the feedback loop compensation, adding an ex-
ternal capacitor between pin 11 (FB) and pin 12 (V ), which will act as speed up (see figure 2).
out
ADDITIONAL FEATURES AND PROTECTIONS
Feedback disconnection
In case of feedback disconnection, the duty cycle increases versus the maximum allowed value, bringing the
output voltage close to the input supply.
THis condition could destroy the load.
To avoid this dangerous condition, the device is turned off if the internal feedback pin remains floating.
Output overvoltage protection
The overvoltage protection, OVP, is realized by using an internal comparator, which input is connected to the
feedback, that turns off the power stage when the OVP threshold is reached.
This threshold is typically 30% higher than the feedback voltage.
6/8
GS-R12HXXX2
Figure 1
Figure 2
Figure 3
7/8
GS-R12HXXX2
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics.
All other names are the property of their respective owners
© 2003 STMicroelectronics - All Rights Reserved
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