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PDF L4974 Data sheet ( Hoja de datos )
| Número de pieza | L4974 | |
| Descripción | 3.5A SWITCHING REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L4974 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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® L4974A
3.5A SWITCHING REGULATOR
. 3.5A OUTPUT CURRENT
. 5.1V TO 40V OUTPUT VOLTAGE RANGE
. 0 TO 90% DUTY CYCLE RANGE
. INTERNAL FEED-FORWARD LINE REG.
. INTERNAL CURRENT LIMITING
. PRECISE 5.1V ± 2% ON CHIP REFERENCE
. RESET AND POWER FAIL FUNCTIONS
. INPUT/OUTPUT SYNC PIN
. UNDER VOLTAGE LOCK OUT WITH HYS-
TERETIC TURN-ON
. PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
. VERY HIGH EFFICIENCY
. SWITCHING FREQUENCY UP TO 200KHz
. THERMAL SHUTDOWN
. CONTINUOUS MODE OPERATION
MULTIPOWER BCD TECHNOLOGY
POWERDIP (16 + 2 + 2)
ORDERING NUMBER : L4974A
DESCRIPTION
The L4974Aisa stepdownmonolithicpower switch-
ing regulator delivering 3.5A at a voltage variable
from 5.1 to 40V.
Realized with BCD mixed technology, the device
uses a DMOS output transistor to obtain very high
efficiency and very fast switching times. Features of
the L4974A include reset and power fail for micro-
processors, feed forward line regulation, soft start,
limiting current and thermal protection. The device
is mountedin a Powerdip16 + 2 + 2 plastic package
and requires few external components. Efficient
operation at switching frequencies up to 200KHz
allows reductionin the size and cost of externalfilter
component.
BLOCK DIAGRAM
June 2000
1/22
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
Figure 1 : Feedforward Waveform.
Figure 2 : Soft Start Function.
Figure 3 : Limiting Current Function.
L4974A
5/22
5 Page 
Figure 6b: P.C. Board and Component Layout of the Circuit of Fig. 5. (1:1 scale)
L4974A
Figure 7 : DC Test Circuits.
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet L4974.PDF ] | |
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