RT9277B Просмотр технического описания (PDF) - Richtek Technology
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RT9277B Datasheet PDF : 12 Pages
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RT9277A/B
Preliminary
Typical Application Circuit
VIN
L1
2.5V to 5.5V
C1
Chip Enable
D1
5 LX
GND 4
6 VIN
EN 3
7 FREQ FB 2
8 NC COMP 1
C2
R3
RT9277A
C4
C3
VOUT
R1
R2
VIN
2.5V to 5.5V
C1
Figure 1
Chip Enable
L1
D1
5 LX
GND 4
6 VIN
EN 3
7 FREQ FB 2
8 SS COMP 1
C2
R3
CSS
RT9277B
C4
C3
VOUT
R1
R2
Figure 2
Symbol
(unit)
Application 1
Application 2
Application 3
Table 1. Component Selection
VIN VOUT FOSC C1
(V) (V) (Hz) (uF)
L1
(uH)
C2
R3 C3 C4
(uF)
(kΩ) (pF) (pF)
3.3
9 1.2M 10 4.7(TDK SLF6028) 33 (ceramic) 82 820 10
3.3 12 1.2M 10 4.7(TDK SLF6028) 33 (ceramic) 180 680 22
3.3 12 640K 10 10(TDK SLF6028) 33 (ceramic) 120 1200 22
Function Block Diagram
www.richtek.com
2
EN
COMP
FB
FREQ
LX
VIN
Protection
VFB
Internal
Soft-Start
Error
Summing
Amplifier Comparator
-
Control
1.24V
+
-
and
+
Driver
N
Logic
Clock
5uA
Oscillator
Slope
Compen-
sation
Current
Sense
RT9277A
VIN
LX
GND
DS9277A/B-02 March 2007
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