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ZXSC410E6TA Datasheet(PDF) 4 Page - Zetex Semiconductors

Part # ZXSC410E6TA
Description  VOLTAGE MODE BOOST CONVERTER
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Manufacturer  ZETEX [Zetex Semiconductors]
Direct Link  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZXSC410E6TA Datasheet(HTML) 4 Page - Zetex Semiconductors

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DEVICE DESCRIPTION
Bandgap Reference
All threshold voltages and internal currents are derived
from a temperature compensated bandgap reference
circuit with a reference voltage of 1.22V nominal.
Dynamic Drive Output
Depending on the input signal, the output is either
“LOW” or “HIGH”. In the high state a 2.5mA current
source (max drive voltage = VCC-0.4V) drives the base
or gate of the external transistor. In order to operate the
external switching transistor at optimum efficiency,
both output states are initiated with a short transient
current in order to quickly discharge the base or the
gate of the switching transistor.
Switching Circuit
The switching circuit consists of two comparators,
Comp1 and Comp2, a gate U1, a monostable and the
drive output. Normally the DRIVE output is “HIGH”; the
external switching transistor is turned on. Current
ramps up in the inductor, the switching transistor and
external current sensing resistor. This voltage is
sensed by comparator, Comp2, at input ISENSE. Once
the current sense voltage across the sensing resistor
exceeds 20mV, comparator Comp2 through gate U1
triggers a re-triggerable monostable and turns off the
output drive stage for 2µs. The inductor discharges to
the load of the application. After 2µs a new charge cycle
begins, thus ramping the output voltage. When the
output voltage reaches the nominal value and VFB gets
an input voltage of more than 300mV, the monostable
is forced “on” from Comp1 through gate U1, until the
feedback voltage falls below 300mV. The above action
continues to maintain regulation.
EOR, End of Regulation Detector
The EOR circuit is a retriggerable 120µs monostable,
which is re-triggered by every down regulating action
of comparator Comp1. As long as regulation takes
place, output EOR is “HIGH“ (high impedance, 100K to
VCC). Short dips of the output voltage of less than
120µs are ignored. If the output voltage falls below the
nominal value for more than 120µs, output EOR goes
”LOW“. The reason for this to happen is usually a
slowly progressing drop of input voltage from the
discharging battery. Therefore the output voltage will
also start to drop slowly. With the EOR detector,
batteries can be used to the ultimate end of discharge,
with enough time left for a safe shutdown.
Block Diagrams
ZXSC410
ZXSC420
SEMICO NDUC TORS
ISSUE 2 - May 2003
4
+
_
+
_
R2
R3
R1
STDN
VCC
DRIVE
SENSE
GND VFB
Shutdown
Bandgap
Reference
Bias Generator
Comp 1
Comp 2
U1
Dynamic
Drive
Monostable
2µs
Fig. 1 ZXSC410
Fig. 1 ZXSC420


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