Voltage Regulators
s
Electrical Characteristics at V
CC
=
18 V, T
a
=
25°C (continued)
Parameter
TON maximum on-period current
TON upper limit voltage
TON lower limit voltage
TOFF upper limit voltage
TOFF lower limit voltage
Output oscillation frequency
Output current feedback current gain
Pre-start low-level output voltage
Low-level output voltage 1
Low-level output voltage 2
High-level output voltage 1
High-level output voltage 2
Pre-start circuit current
Circuit current 1
Symbol
I
3TON
Conditions
FB terminal
=
open
TON terminal
=
GND
Min
−135
0.55
−
0.1
0.7
−
0.1
C
ON
=
2 200 pF, R
OFF
=
1.5 kΩ
C
OFF
=
1 000 pF
I
FB
= −1
mA
V
CC
=
10 V, I
OUT
=
10 mA
I
OUT
=
10 mA
I
OUT
=
100 mA
I
OUT
= −10
mA
I
OUT
= −100
mA
V
CC
=
12V
V
CC
=
18 V
TON terminal
=
GND
FB terminal
=
open
V
CC
=
34 V
TON terminal
=
GND
FB terminal
=
open
V
TDL
=
0.5 V
55
5.05
15.7
15.5
55
8.55
Typ
−110
0.7
0.05
0.9
0.05
65
6.8
1
0.9
1.1
16.5
16.3
95
11.5
AN8028
Max
−85
0.85
0.2
1.1
0.2
75
8.55
1.25
2
2.2
135
14.3
Unit
µA
V
V
V
V
kHz
V
V
V
V
V
µA
mA
V
3TON/H
FB terminal
=
open
V
3TON/L
FB terminal
=
open
V
2TOFF/H
V
2TOFF/L
f
OSC
G
IFB
V
6STB/L
V
6L(1)
V
6L(2)
V
6H(1)
V
6H(2)
I
7STB
I
7OPR(1)
Circuit current 2
I
7OPR(2)
9.6
12.5
15.4
mA
TDL flowing-out current
I
1TDL
−5
0
µA
s
Terminal Equivalent Circuits
Pin No.
1
Equivalent circuit
Description
TDL:
Transformer reset detection terminal.
When the transformer reset is detected and low
is inputted into the terminal, the output of the IC
(V
OUT
) becomes high. However, low-level sig-
nal under the minimum off-period determined
by the T
OFF
is ignored.
TOFF:
Terminal for connecting the resistor and capaci-
tor for determining the minimum off-period (low)
of the IC output (V
OUT
).
An equation for approximate calculation of the
minimum off-period (T
OFF
) is as follows:
T
OFF
=
2.2
×
C
×
R
C: External capacitance
R: External resistance
I/O
I
V
REF
1
High- Low-
side side
clamp clamp
2
V
CC
Comp.
0.1 V
2
3
PANASONIC [ PANASONIC SEMICONDUCTOR ]
