- 您現在的位置：買賣IC網 > PDF目錄384864 > R1224N302E (Ricoh Co., Ltd.) PWM/VFM step-down DC/DC Converter PDF資料下載
參數資料
| 型號： | R1224N302E |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | PWM/VFM step-down DC/DC Converter |
| 中文描述： | 脈寬調制/ VFM的降壓型DC / DC轉換器 |
| 文件頁數： | 1/42頁 |
| 文件大小： | 876K |
| 代理商： | R1224N302E |
當前第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁
R1224N S ERIES
PWM/VFM step-down DC/DC Converter
NO.EA-096-061102
OUTLINE
The R1224N Series are CMOS-based PWM step-down DC/DC Converter controllers with low supply current.
Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a
phase compensation circuit, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable
circuit, resistors for output voltage detect, and input voltage detect circuit. A low ripple, high efficiency step-down
DC/DC converter can be easily composed of this IC with only several external components, or a power-transistor,
an inductor, a diode and capacitors. Output Voltage is fixed or can be adjusted with external resistors (Adjustable
types are without PWM/VFM alternative circuit).
With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching
into the VFM oscillator from PWM oscillator. Therefore, the efficiency at small load current is improved. Several
types of the R1224Nxxx, which are without a PWM/VFM alternative circuit, are also available.
If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. The
protection circuit is Reset-type protection circuit, and it works to restart the operation with soft-start and repeat
this operation until maximum duty cycle condition is released. When the cause of large load current or something
else is removed, the operation is automatically released and returns to normal operation.
Further, built-in UVLO function works when the input voltage is equal or less than UVLO threshold, it makes
this IC be standby and suppresses the consumption current and avoid an unstable operation.
FEATURES
Supply Current................................................................Typ. 20
μ
A (R1224Nxx2E/F/M/L, R1224N102M)
Typ. 30
μ
A (R1224Nxx2G, R1224N102G)
Typ. 40
μ
A (R1224Nxx2H, R1224N102H)
Standby Current..............................................................Typ. 0
μ
A
Input Voltage Range .......................................................2.3V~18.5V
Output Voltage Range.....................................................1.2V to 6.0V (R1224Nxx2x)
1.0V to V
IN
(R1224N102x)
Output Voltage Accuracy.................................................
±
2.0%
Oscillator Frequency.......................................................Typ. 180kHz (R1224Nxx2M, R1224N102M)
Typ. 300kHz (R1224Nxx2E/G, R1224N102G)
Typ. 500kHz (R1224Nxx2F/H, R1224N102H)
Efficiency.........................................................................Typ. 90%
Low Temperature-Drift Coefficient of Output Voltage......Typ.
±
100ppm/°C
Package.......................................................................... SOT-23-5
Built-in Soft-start Function............................................... Typ. 10ms
Built-in Current Limit Circuit
APPLICATIONS
Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
camcorders.
Power source for battery-powered equipment.
Power source for household electrical appliances.
1
相關PDF資料 |
PDF描述 |
|---|---|
| R1224N302F | PWM/VFM step-down DC/DC Converter |
| R1224N302G | PWM/VFM step-down DC/DC Converter |
| R1224N302H | PWM/VFM step-down DC/DC Converter |
| R1224N302L | PWM/VFM step-down DC/DC Converter |
| R1224N302M | PWM/VFM step-down DC/DC Converter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| R122BA19.38.62 | 功能描述:12 AWG 2C 19/25 BC .009" PVC RoHS:是 類別:線纜，導線 >> 多芯導線 系列:* 標準包裝:1 系列:* |
| R122BA19.40.62 | 功能描述:12 AWG 2C 19/25 BC .009" PVC RoHS:是 類別:線纜，導線 >> 多芯導線 系列:* 標準包裝:1 系列:* |
| R122BA19.41.01 | 功能描述:2C/12 19/.0185BC UNSH CL3R RoHS:是 類別:線纜，導線 >> 多芯導線 系列:* 標準包裝:1 系列:* |
| R122BA19.41.06 | 功能描述:12 AWG 2C 19/25 BC .009" PVC RoHS:是 類別:線纜，導線 >> 多芯導線 系列:* 標準包裝:1 系列:* |
| R122BA19.41.62 | 功能描述:2C/12 19/.0185BC UNSH CL3R RoHS:是 類別:線纜，導線 >> 多芯導線 系列:* 標準包裝:1 系列:* |
發布緊急采購，3分鐘左右您將得到回復。