AN8049 Panasonic Semiconductor, AN8049 Datasheet - Page 6

• Manufacturer Part Number: AN8049
• Description: 1.8-volt 3-channel step-up/ step-down/ and polarity inverting DC-DC converter control IC
• Manufacturer: Panasonic Semiconductor

AN8049FHN
6
Pin No.
Terminal Equivalent Circuit
1
2
3
20 k
50 k
3
50 k
1.1 A
1
2
Equivalent circuit
7
7
1.26 V
50 k
50 k
20
22
V
CC
15
15
High
channel 3 operation
is turned off.
PWM1
PWM2
DT2:
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 V
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 V
CTL3:
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.
t
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 V
during U.V.L.O. and timer latch
operation, this pin is connected to
ground through a 20 k resistor.
DLY3
1.26 (V) C
Description
CTL3
REF
REF
pin.
pin.
( F)/1.1 ( A) (s)
CC
. Note that
Voltage Regulators
I/O
I
I