ST GS-R24P User Manual

查询GS-R240001.5供应商

1.8W TO 8W STEP-DOWN SWITCHING REGULATOR FAMILY

FEATURE

■ MTBF 1 000 000 hours (

■ 1.5A m ax output current

■ 35V max input voltage

■ 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

T

amb

GS-R24P

PRELIMINARY

=25)C)

DESCRIPTION

The GS-R24P series is a family of high efficiency
step down switching voltage regulator, designed t o
replace linear regulators.

Based on STM L5973 device, this non isolated family
of regulators are suitable f or the full spectrum of ap­plications including tel ecom, industry, c omputer and
distributed power system applications having a wide­ly ranging input voltage.

Packing type: V = vertical PTH

Packing type: H = horizontal PTH

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

June 2004

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

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GS-R24P

SELECTION CHART

Type

Ordering

Number

Output

Voltage

[V]

Input

Voltage

[V]

Output

Ripple

[mVpp]

Efficiency

[%]

Package

(P)*

Notes

GS-R24(P)0181.5

GS-R24(P)0251.5

GS-R24(P)0331.5

GS-R24(P)0501.5

GS-R24(P)0001.5

* Packing Legend (P)
H = horizontal through hole
S = horizontal SMD
V = vertical through hole

± 4% 16 ÷ 35

1.8

2.5

± 4% 16 ÷ 35

± 4% 16 ÷ 35

3.3

5.0

± 4% 16 ÷ 35

1.235

÷ 5.5 16 ÷ 35

35 72 H-S-V Fixed output

35 76 H-S-V Fixed output

35 82 H-S-V Fixed output

35 85 H-S-V Fixed output

50

68 ÷ 85

H-S Progr. output

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

i

I

out

DC Input Voltage (for GS-R24(P)XXX1.5) 36 V
Maximum Output Current int. limit

voltage

voltage

voltage

voltage

voltage

V

4

V

6

T

stg

T

op

T

op1

INH -0.3 to V
FB 4V
Storage Temperature Range
Operating Ambient Temperature
Operating Ambient Temperature with current derating

-40

-25

-25

i

÷ 105

÷ 70
÷ 85

V

°C
°C
°C

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CONNECTION DIAGRAM AND MECHANICAL DATA
GS-R24Vxxx1.5

GS-R24Hxxx1.5

GS-R24P

GS-R24Sxxx1.5

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GS-R24P

PIN DESCRIPTION

Pin Function Description

1 Input + DC input voltage
2 Input/Output GND Return for input/output voltage source
3V

out

Regulated power output

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

up disables the device

5V

out-c

Regulated output point for additional compensation

6 FB 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 Test Condition Min. Typ. Max. Unit

V

Ripple Voltage Vi =24V Io = 1.5A 35 50 mVpp

r

Temperature Stability V

I

Output Current

o

Current Limit

I

oL

Quiescent Current Vi =24V Io = 0A 1.8 2.5 mA

I

q

Switching Frequency Vi =24V Io = 1.5A 225 250 275 kHz

f

s

+ 1.5V Io = 1.5A mV/°C

i =Vo

V

=16 ÷ 35V

i

V

=16 ÷ 35V

i

01.5A

2.5 3.5 A

SRV Supply Voltage Rejection mV/V

Thermal Resistance Case to ambient °C/W

R

th

ELECTRICAL CHARACTERISTICS for horizontal versions only

(T

=25)C, unless otherwise specified.)

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

I

qst-by

Total Stand-by Quiescent

V

>2.2V Vi = 35V 80 150

inh

Current

INH INH Threshold Voltage Device ON 0.8 V

Device OFF 2.2 V

V

Feedback Voltage

FB

V

=16 ÷ 35V Io = 0÷1.5A

i

1.22 1.235 1.25 V

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µA

GS-R24P

USER NOTES
Input Voltage

The recommended operating maximum DC Input Voltage is 35V 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

150µA for Vi = 35V.
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

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 ov ercurrent or short ci rcuit c ondit ions, c ould in­crease again.

For this reason the switching frequency is also reduced, so keeping the induct or 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.

com patible.

i

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 20

ºC avoids that the devices turns on and off continuously.

Thermal Characteristics

Output voltage programming (GS-R24H(S)0001.5 only)

The GS-R24P output voltage is 5.54V
pin 5 (V

out-c

).

±4%, to reduce this value connect a resistor between pin 6 (FB) and

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
V

out

-1.235)*11.3]/(5.54-V

out

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

out

) --[k

Ohm]

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GS-R24P

F

Loop compensation (GS-R24H(S)0001.5 only)

If required by particular load conditions, it is possible to change the feedback loop compensation, adding an ex­ternal capacitor between pin 6 (FB) and pin 5 (V

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 i nternal comparator, whic h i nput is connec ted t o the
feedback, that turns off the power stage when the OVP threshold is reached.

This threshold is typically 30% higher than the feedback voltage.

igure 1 Figure 2

), wh ic h will a c t as speed up (see figure 2).

out-c

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GS-R24P

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

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