12345
Rev. 1.12 - 5 -
G
R1224N102X (X=G/H/M) (Topt=25
°
C)
Symbol
Item
V
IN
Operating Input Voltage
V
FB
Feedback Voltage
V
IN
=V
CE
=3.5V, I
FB
=-100mA
V
FB
/
T
Temperature Coefficient
fosc
Oscillator Frequency
V
IN
=V
CE
=3.5V, I
FB
=-100mA
M version
G version
H version
f
OSC
/
T
Temperature Coefficient
I
DD1
Supply Current1
V
IN
=V
CE
=V
FB
=18.5V
M version
G version
H version
I
stb
Standby Current
V
IN
=18.5V, V
CE
=0V, V
FB
=0V
I
EXTH
EXT "H" Output Current
V
IN
=8V,V
EXT
=7.9V,V
FB
=8V,V
CE
=8V
I
EXTL
EXT "L" Output Current
V
IN
=8V,V
EXT
=0.1V,V
FB
=0V,V
CE
=8V
I
CEH
CE "H" Input Current
V
IN
=V
CE
=V
FB
=18.5V
I
CEL
CE "L" Input Current
V
IN
= V
FB
=18.5V, V
CE
=0V
V
CEH
CE "H" Input Voltage
V
IN
=8V,V
FB
=0V
V
CEL
CE "L" Input Voltage
V
IN
=8V,V
FB
=0V
Maxdty Oscillator Maximum Duty Cycle
V
UVLO1
UVLO Voltage
V
IN
=V
CE
=2.5V to 1.5V, V
FB
=0V
V
UVLO2
UVLO Release Voltage
V
IN
=V
CE
=1.5V to 2.5V, V
FB
=0V
Conditions
Min.
2.3
0.98
Typ.
Max.
18.5
1.02
Unit
V
V
ppm
/
°
C
kHz
1.00
±
100
Feedback Voltage
-40
°
C
≤
Topt
≤
85
°
C
144
240
400
180
300
500
±
0.2
216
360
600
Oscillator Frequency
-40
°
C
≤
Topt
≤
85
°
C
%
/
°
C
μ
A
20
30
40
0.0
-17
30
0.0
0.0
50
60
80
0.5
μ
A
mA
mA
μ
A
μ
A
V
V
%
V
V
0.5
-0.5
1.5
0.3
100
1.8
2.0
2.2
2.3
V
UVLO
1
+0.1
10
T
start
Delay Time by Soft-Start function
V
IN
=2.5V, I
FB
=-10mA
V
CE
=0V->2.5V
V
IN
=V
CE
=2.5V
V
FB
=2.5V->0V
5
20
ms
T
prot
Delay Time for protection circuit
5
15
30
ms
I
TYPICAL APPLICATION AND APPLICATION HINTS
(1) Fixed Output Voltage Type (R1224Nxx2E/F/G/H/L/M except xx=10)
C3
C2
L
C1
R1
SD
V
OUT
V
IN
CE
CE CONTROL
LOAD
EXT
GND
PMOS
PMOS: HAT1044M (Hitachi) L: CR105-270MC (Sumida, 27
μ
H)
SD1: RB063L-30 (Rohm) C3: 47
μ
F (Tantalum Type)
C1: 10
μ
F (Ceramic Type) C2: 0.1
μ
F (Ceramic Type)
R1: 10