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PDF L4962E Data sheet ( Hoja de datos )

Número de pieza L4962E
Descripción 1.5A POWER SWITCHING REGULATOR
Fabricantes STMicroelectronics 
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® L4962
1.5A POWER SWITCHING REGULATOR
1.5A OUTPUT CURRENT
5.1V TO 40V OUTPUT VOLTAGE RANGE
PRECISE (± 2%) ON-CHIP REFERENCE
HIGH SWITCHING FREQUENCY
VERY HIGH EFFICIENCY (UP TO 90%)
VERY FEW EXTERNAL COMPONENTS
SOFT START
INTERNAL LIMITING CURRENT
THERMAL SHUTDOWN
DESCRIPTION
The L4962 is a monolithic power switching regula-
tor delivering 1.5A at a voltage variable from 5V to
40V in step down configuration.
Features of the device include current limiting, soft
start, thermal protection and 0 to 100% duty cycle
for continuous operating mode.
POW ERDIP
(12 + 2 + 2)
HEPTAWATT
ORDERING NUMBERS : L4962/A (12 + 2 + 2 Powerdip)
L4962E/A (Heptawatt
Vertical)
L4962EH/A (Horizontal
Heptawatt)
The L4962 is mountedin a 16-leadPowerdipplastic
package and Heptawatt packageand requires very
few external components.
Efficient operation at switching frequencies up to
150KHz allows a reduction in the size and cost of
external filter components.
BLOCK DIAGRAM
June 2000
Pin X = Powerdip
Pin (X) = Heptawatt
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L4962E pdf
L4962
CIRCUIT OPERATION (refer to the block diagram)
The L4962 is a monolithicstepdownswitching regu-
lator providing outputvoltagesfrom 5.1V to 40V and
delivering 1.5A.
The regulation loop consists of a sawtooth oscilla-
tor, error amplifier, comparator and the output
stage. An errorsignal is produced by comparing the
output voltage with a precise 5.1V on-chip refer-
ence (zener zap trimmed to ± 2%).
This error signalis thencompared with thesawtooth
signal to generate the fixed frequency pulse width
modulated pulses which drive the output stage.
The gain and frequency stability of the loop can be
adjusted by an external RC network connected to
pin 11. Closing the loop directly gives an output
voltage of 5.1V. Higher voltages are obtained by
inserting a voltage divider.
Output overcurrents at switch on are prevented by
the soft start function. The error amplifier output is
initially clamped by the external capacitor Css and
allowed to rise, linearly, as this capacitor is charged
by a constant current source. Output overload pro-
tection is provided in the form of a current limiter.
The load current is sensed by an internal metal
resistor connected to a comparator. When the load
current exceeds a preset threshold this comparator
sets a flip flop which disables the output stage and
discharges the soft start capacitor. A second com-
parator resets the flip flop when the voltage across
the soft start capacitor has fallen to 0.4V.
The output stage is thus re-enabled and the output
voltage rises under control of the soft start network.
If the overload condition is still present the limiter
will trigger again when the threshold current is
reached. The average short circuit current is limited
to a safe value by the dead time introduced by the
soft start network. The thermal overload circuit dis-
ables circuit operation when the junction tempera-
ture reaches about 150°C and has hysteresis to
prevent unstable conditions.
Figure 1. Soft start waveforms
Figure 2. Current limiter waveforms
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L4962E arduino
L4962
APPLICATION INFORMATION (continued)
Figure 29. DC-DC converter 5.1V/4A, ± 12V/1A. A suggestion how to synchronize a negative output
L1, L3 = COGEMA 946043 (969051)
L2 = COGEMA 946044 (946045)
Figure 30. In multiple supplies several
L4962s can be synchronized as shown
Figure 31. Preregulator for distributed supplies
* L2 and C2 are necessary to reduce the switching frequency spikes
when linear regulators are remote from L4962
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