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參數(shù)資料
| 型號： | R1225N122J-TR |
| 英文描述： | SMPS Controller |
| 中文描述： | 開關(guān)電源控制器 |
| 文件頁數(shù)： | 1/29頁 |
| 文件大?。?/td> | 450K |
| 代理商： | R1225N122J-TR |
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PWM/VFM step-down DC/DC Converter
R1225N Series
2002. Nov. 5
12345
12345
Rev. 1.11 - 1 -
I
OUTLINE
The R1225N 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 soft-start circuit, a latch-type protection circuit, a PWM/VFM alternative circuit, a chip enable
circuit, a phase compensation circuit, and an input voltage detect circuit. Further, protection circuit delay
time adjuster circuit, and resistors for voltage detection are included. A low ripple, high efficiency step-
down DC/DC converter can be easily composed of this IC with some external components, or a power-
transistor, an inductor, a diode and capacitors.
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. The R1225NXXXC/D/K types, 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. It is
latch-type protection circuit, and it works to latch an external Power MOSFET with keeping it off. To
release the condition of protection, after disable this IC with a chip enable circuit, enable it again, or
restart this IC with power-on. Delay Time for protection circuit is adjustable with an external capacitor.
With a built-in UVLO function, when the input voltage is UVLO threshold or less, this IC keeps standby
state, and saves its consumption current and avoids miss-operation. Further, if the set output voltage is
equal or more than 2.1V, with a built-in start-up function, at the power-on moment until the input voltage
becomes more than the set output voltage, DC/DC operation is halted and avoids miss-operation.
I
FEATURES
G
Wide Range of Input Voltage
2.3V
～
18.5V
G
Built-in Soft-start Function and Latch-type Protection Function
G
Three options of Oscillator Frequency
180kHz, 300kHz, 500kHz
G
High Efficiency
Typ. 90%
G
Output Voltage
Stepwise Setting with a step of 0.1V in the range of 1.2V
～
6.0V
G
Standby Current
Typ. 0.0μA
G
High Accuracy Output Voltage
±2.0%
G
Low Temperature-Drift Coefficient of Output Voltage
Typ. ±100ppm/
°
C
I
APPLICATIONS
G
Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
camcorders.
G
Power source for battery-powered equipment.
G
Power source for household electrical appliances.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| R1225N122K-TR | SMPS Controller |
| R1225N132A-TR | SMPS Controller |
| R1225N132B-TR | SMPS Controller |
| R1225N132C-TR | SMPS Controller |
| R1225N132D-TR | SMPS Controller |
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