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参数资料
| 型号： | R1224N532L-TL |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 216 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 9/11页 |
| 文件大小： | 153K |
| 代理商： | R1224N532L-TL |
12345
Rev. 0.06
- 7 -
s
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
VOUT
VIN
CE
CE CONTROL
LOAD
EXT
GND
PMOS
PMOS: HAT1044M (Hitachi) L: CR105-270MC (Sumida, 27
H)
SD1: RB063L-30 (Rohm) C3: 47
F (Tantalum Type)
C1: 10
F (Ceramic Type) C2: 0.1F (Ceramic Type)
R1: 10
(2) Adjustable Output Type (R1224N102G/H/M) Example: Output Voltage=3.2V
C3
C2
L
C1
R1
SD
VFB
VIN
CE
CE CONTROL
LOAD
EXT
GND
C4
R2
R4
R3
PMOS
PMOS: HAT1044M (Hitachi) L: CR105-270MC (Sumida, 27
H)
SD1: RB063L-30 (Rohm) C3: 47
F (Tantalum Type)
C1: 10
F (Ceramic Type) C2: 0.1F (Ceramic Type) C4: 2200pF(Ceramic Type)
R1: 10
, R2=10k, R3=2.7k, R4=22k
When you use these ICs, consider the following issues;
q
As shown in the block diagram, a parasitic diode is formed in each terminal, each of these diodes is not formed for
load current, therefore do not use it in such a way. When you control the CE pin by another power supply, do not make
its "H" level more than the voltage level of VIN pin.
q
Set external components as close as possible to the IC and minimize the connection between the components and
the IC. In particular, a capacitor should be connected to VOUT pin with the minimum connection. And make sufficient
grounding and reinforce supplying. A large switching current could flow through the connection of power supply, an
inductor and the connection of VOUT. If the impedance of the connection of power supply is high, the voltage level of
power supply of the IC fluctuates with the switching current. This may cause unstable operation of the IC.
q
Protection circuit may work if the maximum duty cycle continue for the time defined in the electrical characteristics.
Once after stopping the output voltage, output will restart with soft-start operation. If the difference between input
voltage and output voltage is small, the protection circuit may work.
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