RT9277A/B
Preliminary
Output Voltage vs. Input Voltage
11.986
11.984
Output Voltage vs. Input Voltage
11.998
11.996
640kHz
1.2MHz
Output Voltage (V)
11.982
11.980
11.978
11.976
11.974
Output Voltage (V)
11.994
11.992
11.990
11.988
11.986
V
OUT
= 12V, I
OUT
= 1mA
11.972
2.5
2.8
3.0
3.3
3.5
3.8
4.0
4.3
4.5
4.8
5.0
11.984
2.5
2.8
3.0
3.3
3.5
3.8
V
OUT
= 12V, I
OUT
= 1mA
4.0
4.3
4.5
4.8
5.0
Input Voltage (V)
Input Voltage (V)
No Load Supply Current vs. Input Voltage
500
Current Limit vs. Input Voltage
1.8
1.7
640kHz
640kHz
No Load Supply Current (uA)
450
400
350
300
250
200
Current Limit (mA)
V
OUT
= 12V
1.6
1.5
1.4
1.3
V
OUT
= 12V
1.2
2.5
3.0
3.5
4.0
4.5
5.0
5.5
150
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
V
FB
vs. Temperature
1.238
1300
Frequency vs. Temperature
1.2MHz
1.2MHz
1.238
1.237
1.237
1.236
1.236
1.235
1.235
1.234
1.234
-40
-20
0
20
40
60
80
100
1200
Frequency (kHz)
V
IN
= 3.3V, V
OUT
= 12V
V
FB
Voltage(V)
1100
1000
900
V
IN
= 3.3V, V
OUT
= 12V
800
-40
-20
0
20
40
60
80
100
Temperature
(°C)
Temperature
(°C)
www.richtek.com
8
DS9277A/B-02 March 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
