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L296P Datasheet

HIGH CURRENT SWITCHINGREGULATORS

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L296
® L296P
HIGH CURRENT SWITCHING REGULATORS
. 4 A OUTPUT CURRENT
. 5.1 V TO 40 V OUTPUT VOLTAGE RANGE
. 0 TO 100 % DUTY CYCLE RANGE
. PRECISE (±2 %) ON-CHIP REFERENCE
. SWITCHING FREQUENCY UP TO 200 KHz
. VERY HIGH EFFICIENCY (UP TO 90 %)
. VERY FEW EXTERNAL COMPONENTS
. SOFT START
. RESET OUTPUT
. EXTERNAL PROGRAMMABLE LIMITING
CURRENT (L296P)
. CONTROL CIRCUIT FOR CROWBAR SCR
. INPUT FOR REMOTE INHIBIT AND
SYNCHRONUS PWM
. THERMAL SHUTDOWN
Multi watt®
(15 lead)
ORDERING NUMBERS :
L296 (Vertical)
L296HT (Horizontal)
L296P (Vertical)
L296PHT (Horizontal)
DESCRIPTION
The L296 andL296P are stepdownpowerswitching
regulators delivering 4 A at a voltage variable from
5.1 V to 40 V.
Featuresof the devices includesoft start, remotein-
hibit, thermal protection, a reset output for micro-
processors and a PWM comparator input for syn-
chronization in multichip configurations.
The L296P incudes external programmable limiting
current.
The L296 and L296P are mounted in a 15-lead Mul-
tiwatt® plasticpowerpackageand requiresvery few
external components.
Efficient operation at switching frequencies up to
200 KHz allows a reduction in the size and cost of
external filter components. A voltage sense input
and SCR drive output are provided for optional
crowbar overvoltage protection with an external
SCR.
PIN CONNECTION (top view)
June 2000
1/22


STMicroelectronics Electronic Components Datasheet

L296P Datasheet

HIGH CURRENT SWITCHINGREGULATORS

No Preview Available !

L296 - L296P
PIN FUNCTIONS
N° Name
Function
1 CROWBAR INPUT Voltage Sense Input for Crowbar Overvoltage Protection. Normally connected to the
feedback input thus triggering the SCR when V out exceeds nominal by 20 %. May
also monitor the input and a voltage divider can be added to increase the threshold.
Connected to ground when SCR not used.
2
OUTPUT
Regulator Output
3 SUPPLY VOLTAGE Unrergulated Voltage Input. An internal Regulator Powers the L296s Internal Logic.
4 CURRENT LIMIT A resistor connected between this terminal and ground sets the current limiter
threshold. If this terminal is left unconnected the threshold is internally set (see
electrical characteristics).
5
SOFT START
Soft Start Time Constant. A capacitor is connected between this terminal and ground
to define the soft start time constant. This capacitor also determines the average
short circuit output current.
6 INHIBIT INPUT TTL – Level Remote Inhibit. A logic high level on this input disables the device.
7
SYNC INPUT
Multiple L296s are synchronized by connecting the pin 7 inputs together and omitting
the oscillator RC network on all but one device.
8
GROUND
Common Ground Terminal
9
FREQUENCY
A series RC network connected between this terminal and ground determines the
COMPENSATION regulation loop gain characteristics.
10 FEEDBACK INPUT The Feedback Terminal on the Regulation Loop. The output is connected directly to
this terminal for 5.1V operation ; it is connected via a divider for higher voltages.
11
OSCILLATOR
A parallel RC networki connected to this terminal determines the switching frequency.
This pin must be connected to pin 7 input when the internal oscillator is used.
12 RESET INPUT Input of the Reset Circuit. The threshold is roughly 5 V. It may be connected to the
feedback point or via a divider to the input.
13 RESET DELAY A capacitor connected between this terminal and ground determines the reset signal
delay time.
14 RESET OUTPUT Open collector reset signal output. This output is high when the supply is safe.
15 CROWBAR OUTPUT SCR gate drive output of the crowbar circuit.
BLOCK DIAGRAM
2/22


Part Number L296P
Description HIGH CURRENT SWITCHINGREGULATORS
Maker STMicroelectronics
Total Page 22 Pages
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