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| 型号： | RP504N291B-TR-FE |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.9 A SWITCHING CONTROLLER, 2550 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 5 PIN |
| 文件页数： | 5/29页 |
| 文件大小： | 996K |
| 代理商： | RP504N291B-TR-FE |
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RP504x
13
Output Current and selection of External components
The relation between the output current and external components is as follows:
(Wherein, Ripple Current p-p value is described as IRP, ON resistance of Pch Tr. and Nch Tr. of LX are
respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.)
When Pch Tr. of LX is ON:
VIN = VOUT + (RONP + RL)
× IOUT + L × IRP / ton ................................................................. Equation 3
When Pch Tr. of LX is "OFF" (Nch Tr. is "ON"):
L
× IRP / toff = RONN × IOUT + VOUT + RL × IOUT ................................................................. Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of Pch transistor, DON = ton / (toff + ton),
DON = (VOUT + RONN
× IOUT + RL × IOUT) / (VIN + RONN × IOUT RONP × IOUT)....................... Equation 5
Ripple Current is as follows:
IRP = (VIN VOUT RONP
× IOUT RL × IOUT) × DON / fosc / L............................................. Equation 6
wherein, peak current that flows through L, and LX Tr. is as follows:
ILXmax = IOUT + IRP / 2 .................................................................................................... Equation 7
Consider ILXmax, condition of input and output and select external components.
The above explanation is directed to the calculation in an ideal case in continuous mode.
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| RP50GB | 制造商:Superior Electric 功能描述:Electrical Connector; Pin Receptacle; 0.25 in.; 1.25 in.; 0.25 in. (Max.); 50 A 制造商:Superior Electric 功能描述:RECEPTACLE PIN 50A BLACK 制造商:Superior Electric 功能描述:RECEPTACLE, PIN, 50A, BLACK 制造商:Superior Electric 功能描述:TEST RECEPTACLE, PIN-RCPT, 50A, WW, BLK; Series:RP50; Gender:Receptacle; Voltage Rating:250V; Current Rating:50A; Connector Mounting:Cable; Contact Termination:Wire Wrap; Body Material:Nylon Plastic; Color:Black ;RoHS Compliant: Yes 制造商:Superior Electric 功能描述:Conn Binding Post PIN 1 POS ST Panel Mount 1 Port |
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