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參數(shù)資料
| 型號： | MIC3833BN |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Current-Fed PWM Controllers |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 100K |
| 代理商： | MIC3833BN |
MIC3832/3833
Micrel
4-136
April 1998
Pin Description
Pin Number
Pin Name
Pin Function
1
GND
Ground: Use as single-point ground tie point.
2
PWM
PWM Output: Variable duty-cycle totem pole output.
3
Q
Switch (Output): Totem pole output. Noninverting 50% duty cycle output
(180
°
out-of-phase with Q with no dead time).
4
V
DD
5V REF
Supply Voltage (Input): Clamped to 22V by internal zener diode.
5
5V Bandgap Reference (Output)
6
EA –
Inverting Error Amplifier Input
7
EA +
Noninverting Error Amplifier Input
8
EA OUT
Error Amplifier Output: Connect to the appropriate feedback network to
adjust the open loop gain or frequency response.
9
NC
No Connection: Do not use—leave open.
10
SHDN
Overcurrent Shutdown (Input): >1 V disables outputs, >1.25V initiates soft-
start restart. For cycle-by-cycle current limiting, even in voltage-mode control
applications, connect to current sensor. If current sense is not used, connect
to GND.
11
MDC/SS
Maximum Duty Cycle/Soft Start (Input): Apply a dc voltage to adjust maxi-
mum duty cycle (see chart). Adjust soft start by adding capacitance to
increase turn-on time during initial start up or restart after overcurrent
shutdown.
12
CMR
Current Mode Ramp: Feed point for a sample of inductor current when using
current mode control. For voltage-mode control, connect directly to the C
T
pin.
13
SYNC
Synchronization (Input): AC coupled input from an external master clock
(reference) signal. If not used, leave unconnected. A high (>1.5V) resets the
C
T
ramp.
Oscillator Timing Resistor: Connect 4k
minimum resistor to GND.
14
R
T
C
T
15
Oscillator Timing Capacitor: Connect capacitor to GND. See “Typical
Characteristics: Discharge Time” graph for capacitor value.
Maximum oscillator frequency
1
2
discharge time
=
×
)
16
Q
Switch (Output): Totem pole output. Inverting 50% duty cycle output (180
°
out-of-phase with Q with no deadtime).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC3833BWM | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Current-Fed PWM Controllers |
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| MIC3838BMM | 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(biāo)準(zhǔn)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) |
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