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參數(shù)資料
| 型號： | MIC3839 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Flexible Push-Pull PWM Controller |
| 中文描述： | 靈活的推挽式PWM控制器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 341K |
| 代理商： | MIC3839 |
MIC3838/3839
Functional Diagram
Micrel
MIC3838/3839
8
August 2003
Functional Description
The MIC3838/9 is a high-speed power supply controller with
push-pull output drive capability. MIC3838 has a higher V
DD
turn-on threshold and more hysteresis between V
DD
turn-on
and turn-off than the MIC3839. The outputs of the controller
operate in a push-pull fashion with a guaranteed dead time
between them. A block diagram of the MIC3838/9 controller
is shown in Figure 1.
T
Q
/Q
Q
S
R
Q
S
R
Q
S
R
Oscillator
V
DD
OK
V
DD
V
DD
D1V
Peak Current
Comparator
Overcurrent
Comparator
PWM
Comparator
PWM
Latch
Slope = 1V/ms
Soft Start
2.2V
2.0V
0.5V
R
0.8V
14V
V
DD
OUTA
OUTB
GND
0.5V
1.2R
0.75V
Error
Amplifier
RC
V
REF
FB
COMP
RAMP
ILIM
Voltage
Reference
3.65V
Figure 1. MIC3838 Block Diagram
MIC3838
330pF
330pF
V
IN
= 36V to 75V
50k
150k
13k
4.5k
V
COMP
0.5V
0.75V
Peak Current
Comparator
Over Current
Comparator
PWM
Comparator
Oscillator
V
MAX
at Ramp Input = 1.5V
V
MAX
at I
LIM
Input = 0.5V
Figure 2. Volt Second Clamp and Voltage Feed Forward Circuit
V
DD
and Turn-on Sequence
The oscillator and output gate drive signals are disabled
when V
DD
is lower than the turn on threshold. Circuitry in the
output drivers eliminates glitching or random pulsing during
the start-up sequence. The oscillator is enabled when V
DD
is
applied and reaches the turn-on threshold. The V
DD
com-
parator also turns off the internal soft-start discharge FET,
slowly bringing up the COMP pin voltage.
The V
DD
pin is internally clamped. As V
DD
approaches this
clamp voltage, the V
DD
current will increase over the normal
current draw of the IC. IDD currents greater than 20mA may
cause excessive power dissipation in the MIC3838/9.
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參數(shù)描述 |
|---|---|
| MIC3839BMM | 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) |
| 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(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) |
| MIC3839YMM | 功能描述:DC/DC 開關(guān)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(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| MIC3839YMM TR | 功能描述:DC/DC 開關(guān)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(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| MIC384 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Three-Zone Thermal Supervisor Advance Information |
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