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UC2578DP 데이터시트(PDF) 4 Page - Texas Instruments

부품명 UC2578DP
상세설명  Buck Pulse Width Modulator Stepdown Voltage Regulator
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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UC2578DP 데이터시트(HTML) 4 Page - Texas Instruments

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UC2578
UC3578
Current Limit
The current sense pin provides overcurrent shutdown.
As can be seen from the block diagram, the overcurrent
comparator is wire ANDed with the oscillator after an in-
ternally set blanking time. The ILIMIT threshold level is set
by the current sense resistor from RSENSE.
I
V
R
LIMIT
SENSE
=
05
.
An optional filter can be added (RSCS) from the current
sense resistor to CS to provide high frequency filtering of
the current sense signal if necessary.
During a current limit condition, the soft start capacitor on
SS is discharged until its voltage level reaches 1.2V. Dur-
ing this time, a duty cycle clamp is activated to approxi-
mately 0.6V above the voltage level on the SS capacitor.
This condition persist until the SS capacitor is discharged
to 1.2V, thus disabling the output driver. At this time, the
SS capacitor is allowed to charge to 5V through the 50
µA
current source and normal operation resumes when the
SS capacitor reaches 5V. During the condition described,
the regulator enters a hiccup current limit mode of opera-
tion which limits the power dissipation in the MOSFET
and output rectifier under a short circuit condition.
Error Amplifier
The onboard error amplifier of the UC3578 is a voltage
amplifier with its non-inverting input tied to an internal 2V
reference. As usual, loop compensation can be added
from the inverting input of EAINV to the error amplifier
output at EAOUT. Consideration must be given when
choosing the values of the compensation components
around the amplifier so that the output swing of the am-
plifier is not restricted. The output of the amplifier can
source 100
µA typically.
General
As in any buck converter, when the switch is off, the
source
flies
low
due
to
the
conduction
of
the
free-wheeling rectifier. The source (SRC) is pulled below
ground by an amount determined by the forward voltage
drop of the rectifier and by any transient voltage spike
from inductance in this path. The occurrence of this con-
dition could result in erratic operation of the IC during this
period if the negative excursion is not limited. This is be-
cause of conduction of current in the substrate of the IC
due to the source pin being pulled below ground and for-
ward biasing the internal substrate PN junction. To limit
this effect, a small resistor (15
Ω) can be placed in series
between the MOSFET source and the SRC pin as shown
in Fig. 1. Too large a resistor will limit the drive to the
Figure 1. Block diagram.
APPLICATION INFORMATION (cont.)
UDG-97006


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