Voltage Regulators
AN8026
■ Electrical Characteristics at VCC = 18 V, Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min
Typ Max Unit
TON maximum on-period current
I3TON FB terminal = open
TON terminal = GND
−125 −100 −75
µA
TON upper limit voltage
TON lower limit voltage
TOFF upper limit voltage
TOFF lower limit voltage
Output oscillation frequency
V3TON/H FB terminal = open
V3TON/L FB terminal = open
V2TOFF/H
0.55
− 0.1 0.05
0.7 0.9
0.7
0.8
0.2
1.1
0.2
70
V
V
V
V2TOFF/L
− 0.1 0.05
V
fOSC
CON = 2 200 pF, ROFF = 1.5 kΩ 50
60
kHz
COFF = 1 000 pF
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
GIFB
IFB = −1 mA
5.25
7
8.75
1.25
2
V6STB/L VCC = 10 V, IOUT = 10 mA
V6L(1) IOUT = 10 mA
1
V
V
0.9
1.1
V6L(2) IOUT = 100 mA
2.2
V
V6H(1) IOUT = −10 mA
V6H(2) IOUT = −100 mA
15.7 16.5
15.5 16.3
V
V
I7STB
I7OPR(1) VCC = 18 V
TON terminal = GND
FB terminal = open
I7OPR(2) VCC = 34 V
VCC = 12 V
40
80
120
µA
mA
Circuit current 1
7.4
9.5
11.6
Circuit current 2
7.8
10
12.2
mA
TON terminal = GND
FB terminal = open
TDL flowing-out current
I1TDL VTDL = 0.3 V
−28
−20
µA
■ Terminal Equivalent Circuits
Pin No.
Equivalent circuit
Description
I/O
1
TDL:
Transformer reset detection terminal.
I
VREF
When the transformer reset is detected and low is
inputted into the terminal, the output of the IC
(VOUT) becomes high. However, low-level sig-
nal under the minimum off-period determined
by the TOFF is ignored.
1
High- Low-
side
side
clamp clamp
2
TOFF:
Terminal for connecting the resistor and capaci-
tor for determining the minimum off-period (low)
of the IC output (VOUT).
VCC
An equation for approximate calculation of the
minimum off-period (TOFF) is as follows:
Comp.
0.1 V
T
OFF = 2.2 × C × R
C: external capacitance
R: external resistance
2
3
PANASONIC [ PANASONIC ]
