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參數(shù)資料
| 型號(hào)： | LM3310 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Step-up PWM DC/DC Converter with Integrated Op-Amp and Gate Pulse Modulation Switch |
| 中文描述： | 升壓PWM直流/直流轉(zhuǎn)換器集成的運(yùn)算放大器和脈沖調(diào)制開關(guān)門 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大小： | 1668K |
| 代理商： | LM3310 |
Operation
(Continued)
As VGHM is discharged through R3, the comparator con-
nected to the pin V
DD
monitors the VGHM voltage. PMOS
switch P3 will turn off when the following is true:
VGHM
MIN
)
10V
X
R2/(R1 + R2)
where V
X
is some voltage connected to the resistor divider
on pin V
. V
is typically connected to the output of the
boost switching regulator. When PMOS switch P3 turns off,
VGHM will be high impedance until the VFLK pin is high
again.
Figure 3
and
Figure 4
give typical transient waveforms for
the GPM block. Waveform (1) is the VGHM pin, (2) is the
VFLK and (3) is the VDPM. The output of the boost switching
regulator is operating at 8.5V and there is a 3x discrete
charge pump (~23.5V) supplying the VGH pin. In
Figure 3
and
Figure 4
, the VGHM pin is driving a purely capacitive
load, 4.7nF. The value of resistor R1 is 15kohm, R2 is 1.1k
and R3 is 750
. In both transient plots, there is no C
E
delay
capacitor.
In the GPM block diagram, a signal called “Reset” is shown.
This signal is generated from the V
under-voltage lockout,
thermal shutdown, or the SHDN pin. If the V
supply voltage
drops below 2.3V, typically, then the GPM block will be
disabled and the VGHM pin will discharge through NMOS
switch N2 and the 1k
resistor. This applies also if the
junction temperature of the device exceeds 145C or if the
SHDN signal is low. As shown in the block diagram, both
VDPM and VFLK have internal 350k
pull down resistors.
This puts both VDPM and VFLK in normally “off” states.
Typical VDPM and VFLK pin currents can be found in the
Typical Performance Characteristics
section.
INTRODUCTION TO COMPENSATION (BOOST
CONVERTER)
20133385
FIGURE 3.
20133386
FIGURE 4.
20133305
FIGURE 5. (a) Inductor current. (b) Diode current.
L
www.national.com
16
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3310_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Step-Up PWM DC/DC Converter with Integrated Op-Amp and Gate Pulse Modulation Switch |
| LM3310SQ | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM3310SQ/NOPB | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM3310SQX | 功能描述:DC/DC 開關(guān)控制器 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 |
| LM3310SQX/NOPB | 功能描述:DC/DC 開關(guān)控制器 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 |
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