GS-R12P0251.5 [STMICROELECTRONICS]

1.8W TO 8W STEP-DOWN SWITCHING REGULATOR FAMILY; 1.8W TO 8W降压型开关稳压器系列


型号：	GS-R12P0251.5
厂家：	ST
描述：	1.8W TO 8W STEP-DOWN SWITCHING REGULATOR FAMILY 1.8W TO 8W降压型开关稳压器系列稳压器开关
文件：	总7页 (文件大小：67K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

GS-R12P

1.8W TO 8W STEP-DOWN SWITCHING REGULATOR FAMILY

PRELIMINARY

FEATURE

■ MTBF 1 000 000 hours (

■ 1.5A max output current

■ 16V max input voltage

T =25 C)

amb

■ 1.5V max drop-out voltage

■ Remote logic inhibit/enable

■ Not-latching overload and short circuit

protection

■ Thermal shutdown

■ Fixed or adjustable output

■ No heatsink required

Packing type: V = vertical PTH

DESCRIPTION

The GS-R12P series is a family of high efficiency

step down switching voltage regulator, designed to

replace linear regulators.

Based on STM L5973 device, this non isolated family

of regulators are suitable for the full spectrum of ap-

plications including telecom, industry, computer and

distributed power system applications having a wide-

ly ranging input voltage.

Packing type: H = horizontal PTH

-------------------S = horizontal SMD

June 2004

1/7

This is preliminary information on a new product now in development. Details are subject to change without notice.

GS-R12P

SELECTION CHART

Type

Ordering

Number

Output

Voltage

[V]

Input

Voltage

[V]

Output

Ripple

[mVpp]

Efficiency

[%]

Package

(P)*

Notes

GS-R12(P)0181.5

GS-R12(P)0251.5

GS-R12(P)0331.5

GS-R12(P)0501.5

GS-R12(P)0001.5

* Packing Legend (P)

H-S-V

H-S

Fixed output

voltage

1.8 ± 4%

2.5 ± 4%

3.3 ± 4%

5.0 ± 4%

1.235 ÷ 5.5

4.5 ÷ 15

6.6 ÷ 15

4.5 ÷ 15

Fixed output

voltage

Fixed output

voltage

Fixed output

voltage

Progr. output

voltage

68 ÷ 85

H = horizontal through hole

S = horizontal SMD

V = vertical through hole

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

DC Input Voltage (for GS-R12(P)XXX1.5)

Maximum Output Current

INH

int. limit

out

-0.3 to V

Storage Temperature Range

Operating Ambient Temperature

°C

-40 ÷ 105

-25 ÷ 70

-25 ÷ 85

stg

op1

Operating Ambient Temperature with current derating

2/7

GS-R12P

CONNECTION DIAGRAM AND MECHANICAL DATA

GS-R12VXXX1.5

GS-R12HXXX1.5

GS-R12SXXX1.5

3/7

GS-R12P

PIN DESCRIPTION

Function

Description

Input +

DC input voltage

Input/Output GND

Return for input/output voltage source

Regulated power output

out

INH

A logical level (active high) disables the device, when it is open an internal pull

up disables the device

Regulated output point for additional compensation

out-c

Feedback input, available on adjustable device and on request for additional

compensation

ELECTRICAL CHARACTERISTICS All versions (T =25 C, unless otherwise specified.)

amb

Symbol

Parameter

Ripple Voltage

Test Condition

Min.

Typ.

Max.

Unit

V =12V I = 1.5A

mVpp

mV/°C

Temperature Stability

Output Current

Current Limit

V =V + 1.5V I = 1.5A

i o o

1.5

V =4.5 ÷ 16V

2.5

1.8

250

V =4.5 ÷ 16V

Quiescent Current

V =12V I = 0A

2.5

kHz

Switching Frequency

Supply Voltage Rejection

Thermal Resistance

V =12V I = 1.5A

225

275

SRV

mV/V

°C/W

Case to ambient

ELECTRICAL CHARACTERISTICS for horizontal versions only (T =25 C, unless otherwise specified.)

amb

Symbol

Parameter

Test Condition

>2.2V V = 15V

Min.

Typ.

Max.

Unit

Total Stand-by Quiescent

Current

inh

100

µA

qst-by

INH

INH Threshold Voltage

Device ON

0.8

Device OFF

2.2

Feedback Voltage

1.22

1.235

1.25

V =4.5 ÷ 15V I = 0÷1.5A

4/7

GS-R12P

USER NOTES

Input Voltage

The recommended operating maximum DC Input Voltage is 15V inclusive of ripple voltage.

Inhibit function

The inhibit feature allows to put in stand-by mode the device.

With INH pin 4 higher than 2.2V the device is disabled and the power consumption is reduced to less than

100µA for V = 15V.

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.

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.

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-R12H(S)0001.5 only)

The GS-R12P output voltage is 5.54V ±4%, to reduce this value connect a resistor between pin 6 (FB) and

pin 5 (V ).

out-c

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)*11.3]/(5.54-V ) --[kOhm]

out

can be adjusted between 1.235V (Rv=0 Ohm) and 5.54V (Rv=open)

5/7

GS-R12P

Loop compensation (GS-R12H(S)0001.5 only)

If required by particular load conditions, it is possible to change the feedback loop compensation, adding an ex-

ternal capacitor between pin 6 (FB) and pin 5 (V ), which will act as speed up (see figure 2).

out-c

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.

Figure 1

Figure 2

6/7

GS-R12P

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the con-

sequences 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 men-

tioned 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

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