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AN8014S Datasheet(Fiches technique) 6 Page - Panasonic Semiconductor

Numéro de pièce AN8014S
Description  Step-down, step-up, or inverting DC-DC converter control IC
Télécharger  18 Pages
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Fabricant  PANASONIC [Panasonic Semiconductor]
Site Internet  http://www.panasonic.com/industrial/
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AN8014S
Voltage regulators
6
Pin No.
I / O
Equivalent circuit
Description
5
S.C.P.:
Connection for the capacitor that sets the
soft start period and the timer latch short-
circuit protection circuit time constant.
Use a capacitor with a value of 1 000 pF
or higher.
The charge current ICHG is decided by the
timing resistor RT which controls sample
to sample variations and temperature varia-
tions.
It is approx.
−2.3 µA when R
T = 15 kΩ.
ICHG =
VRT × 1 [A]
RT
11
6I
IN
+:
Noninverting input to the error amplifier.
Use the common-mode input in the range
− 0.1 V to +0.8 V.
7I
IN
−:
Inverting input to the error amplifier.
Use the common-mode input in the range
− 0.1 V to +0.8 V.
8
O
FB:
Output from the error amplifier.
The source current is approx.
−110 µA and
sink current is approx. 8 mA.
Correct the frequency characteristics of
the gain and the phase by connecting a re-
sistor and a capacitor between this pin
and IN
− pin.
9

N.C.: Not connected.
10
I
CLM:
Detects the overcurrent state in switching
transistor.
Insert a resistor with a low resistance between
this pin and VCC to detect overcurrent states.
When this pin falls to a level 95 mV or
more lower than VCC , the PWM output is
turned off for that period thus narrowing
the width of the on-period.
(This implements a pulse-by-pulse
overcurrent protection technique.)
s Terminal Equivalent Circuits (continued)
7
6
VREF
IN
IN
+
50
µA
50
µA
10
VCC
0.1 V
CLM
comp.
CLM
8
VREF
FB
Sink current
Source current
R
S
Q
VREF
S.C.P.
5
0.75 V
U.V.L.O.
output
ICHG
Latch




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