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參數(shù)資料
| 型號： | MIC3839BMM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Flexible Push-Pull PWM Controller |
| 中文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MSOP-10 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 341K |
| 代理商： | MIC3839BMM |
MIC3838/3839
Ordering Information
Micrel
MIC3838/3839
2
August 2003
Turn On
Threshold
12.5V
4.3V
Turn Off
Threshold
8.3V
4.1V
Part Number
MIC3838BMM
MIC3839BMM
Temperature Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Package
MSOP-10
MSOP-10
Pin Configuration
1
COMP
FB
ILIM
RAMP
10 VREF
VDD
OUTA
OUTB
9
8
7
2
3
4
RC
GND
6
5
MSOP-10 (MM)
Pin Description
Pin Number
Pin Name
Pin Function
1
COMP
COMP is the output of the error amplifier and the input of the PWM
comparator. The error amplifier in the MIC3838 is a true low-output imped-
ance, 4MHz operational amplifier. As such, the COMP pin can both source
and sink current. However, the error amplifier is internally current limited, so
that zero duty cycle can be externally forced by pulling COMP to GND.
The MIC3838 family features built-in full cycle soft start. Soft start is imple-
mented as a clamp on the maximum COMP voltage.
2
FB
The inverting input to the error amplifier.
3
ILIM
The input to the peak current, and overcurrent comparators. The
overcurrent comparator is only intended for fault sensing. Exceeding the
overcurrent threshold will cause a soft start cycle. An internal MOSFET
discharges the current sense filter capacitor to improve dynamic perfor-
mance of the power converter.
4
RAMP
Input to the PWM comparator. Sawtooth ramp for PWM control. Allows for
either current-mode or voltage-mode control. An internal MOSFET dis-
charges the current sense filter capacitor.
5
RC
The oscillator programming pin. Only two components are required to
program the oscillator, a resistor (tied between V
DD
and RC), and a capaci-
tor (tied between RC and GND). The approximate oscillator frequency is
determined by the simple formula:
F
1.41
R
×
C
OSCILLATOR
=
The recommended range of timing resistors is between 7k
and 200k
and
range of timing capacitors is between 100pF and 1000pF. Timing resistors
less than 7k
should be avoided. For best performance, keep the leads
between components as short as possible. Separate ground and VDD
traces to the external timing network are encouraged.
6
GND
Ground. Return path for signal and gate drive functions.
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| MIC3839BMM TR | 功能描述:IC REG CTRLR ISO PWM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MIC3839YMM | 功能描述:DC/DC 開關控制器 Push-Pull DC/DC Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| MIC3839YMM TR | 功能描述:DC/DC 開關控制器 Push-Pull DC/DC Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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