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参数资料
| 型号： | R1218K021A-TR |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1.80 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件页数： | 19/19页 |
| 文件大小： | 276K |
| 代理商： | R1218K021A-TR |
R1218x
9
Selection of Inductors
The peak current of the inductor at normal mode can be calculated as next formula:
ILXpeak
=1.25 × ILED × VOUT / VIN + 0.5 × VIN × (VOUT VIN) / (L × VOUT × fosc)
When the start-up or dimming control by CE pin, transient current flows, the peak current must be equal or
less than the current limit of the IC. The peak current should not beyond the rating current of the inductor. For
example, for 4 serial LED drive from VIN
=3.6V, recommendation value of the inductor is 22μH or more.
Selection of Capacitors
Set 1
μF or more value bypass capacitor C1 between VIN pin and GND pin as close as posible.
Set 0.22
μF or more capacitor C2 between VOUT and GND pin.
TEST CIRCUITS
A
VIN
CE
GND
VFB
VOUT
LX
R1218x
Series
VIN
CE
GND
VFB
VOUT
LX
R1218x
Series
OSCILLOSCOPE
Supply Current Test Circuit
UVLO Detector Threshold,
UVLO Released Voltage
VIN
CE
GND
VFB
VOUT
LX
R1218x
Series
OSCILLOSCOPE
VIN
CE
GND
VFB
VOUT
LX
R1218x
Series
OSCILLOSCOPE
VFB Voltage, Oscillator Frequency,
OVP Detector Threshold,
Maximum Duty Test Circuit
OVP Released Voltage Test Circuit
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