L4970A bassed Data Sheet Ic Switching circuit and explanation

IC L4970A DESCRIPTION

The L4970A is a stepdown monolithic power switching regulator delivering 10A 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 L4970A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter components. This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
June 2000

FEATURE IC L4970A

10A OUTPUT CURRENT
5.1V TO 40V OUTPUT VOLTAGERANGE
0 TO 90% DUTY CYCLE RANGE
INTERNAL FEED-FORWARD LINE REGULATION
INTERNAL CURRENT LIMITING
PRECISE 5.1V ± 2% ON CHIP REFERENCE
RESET AND POWER FAIL FUNCTIONS
SOFT START
INPUT/OUTPUT SYNC PIN
UNDER VOLTAGE LOCK OUT WITH HYSTERETIC
TURN-ON
PWM LATCH FOR SINGLE PULSE PER PERIOD
VERYHIGH EFFICIENCY
SWITCHING FREQUENCY UP TO 500KHz
THERMAL SHUTDOWN
CONTINUOUS MODE OPERATION

ABSOLUTE MAXIMUM RATINGS IC L4970A

IC L4970A PIN FUNCTIONS

5.1V / 10A Low Cost Application IC L4970A

10A Switching Regulator, Adjustable from 0V to 25V IC L4970A