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AN8049FHN Datasheet(Fiches technique) 6 Page - Panasonic Semiconductor

Numéro de pièce AN8049FHN
Description  1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC
Télécharger  23 Pages
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Fabricant  PANASONIC [Panasonic Semiconductor]
Site Internet  http://www.panasonic.com/industrial/
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AN8049FHN Datasheet(HTML) 6 Page - Panasonic Semiconductor

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AN8049FHN
Voltage Regulators
6
Pin No.
Equivalent circuit
Description
I/O
1
DT2:
I
Sets the channel 2 soft start time.
Set the time by connecting a capacitor
between this pin and ground.
Note that although the channel 2
maximum on duty is set internally to
86%, the maximum on duty can be set
to a value of 86% or less by inserting
a resistor between this pin and ground,
and can be set to a value of 86% or
more by inserting a resistor between
this pin and the VREF pin.
2
DT1:
Sets the channel 1 soft start time.
Set the time by connecting a capacitor
between this pin and ground.
Note that although the channel 1
maximum on duty is set internally to
86%, the maximum on duty can be set
to a value of 86% or less by inserting
a resistor between this pin and ground,
and can be set to a value of 86% or
more by inserting a resistor between
this pin and the VREF pin.
3
CTL3:
I
Controls the on/off state of channel 3.
A delay can be provided in the power
supply turn-on start time by connecting
a capacitor between this pin and ground.
tDLY3 = 1.26 (V) × CCTL3 (µF)/1.1 (µA) (s)
This pin can also be used to control the
on/off state with an external signal.
In that case, the allowable input voltage
range is from 0 V to VCC. Note that
during U.V.L.O. and timer latch
operation, this pin is connected to
ground through a 20 k
Ω resistor.
s Terminal Equivalent Circuit
PWM2
50 k
50 k
1
7
15
20
PWM1
50 k
50 k
15
22
7
2
1.26 V
VCC
20 k
1.1
µA
High
channel 3 operation
is turned off.
3


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