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參數(shù)資料
| 型號(hào)： | LM5035AMH-1 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數(shù)： | 16/30頁 |
| 文件大?。?/td> | 585K |
| 代理商： | LM5035AMH-1 |
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30034136
FIGURE 13. Remote Standby and Disable Control
To maintain the threshold’s accuracy, a resistor tolerance of
1% or better is recommended.
The design process starts with the choice of the voltage dif-
ference between the UVLO enabling and disabling thresh-
olds. This will also approximately set the difference between
OVP enabling and disabling regulation:
Next, the combined resistance of R
2 and R3 is calculated by
choosing the threshold for the UVLO disabling threshold:
Then R
3 is determined by selecting the OVP disabling thresh-
old:
Finally, R
3 is subtracted from RCOMBINED to give R2:
R
2 = RCOMBINED - R3
Remote configuration of the controller’s operational modes
can be accomplished with open drain device(s) connected to
the UVLO pin as shown in Figure 13.
FAULT PROTECTION
The Over Voltage Protection (OVP) comparator of the
LM5035A can be configured for line or load fault protection or
thermal protection using an external temperature sensor or
thermistor. Figure 11 shows a line over voltage shutdown ap-
plication using a voltage divider between the input power
supply, V
PWR, and AGND to monitor the line voltage.
Figure 14 demonstrates the use of the OVP pin for latched
output over-voltage fault protection, using a zener and opto-
coupler. When V
OUT exceeds the conduction threshold of the
opto-coupler diode and zener, the opto-coupler momentarily
turns on Q1 and the LM5035A enters standby mode, disabling
the drivers and enabling the hysteresis current source on the
OVP pin. Once the current source is enabled, the OVP volt-
age will remain at 2.3V (23 A x 100 k
) without additional
drive from the external circuit. If the opto-coupler transistor
emitter were directly connected to the OVP pin, then leakage
current in the zener diode amplified by the opto-coupler’s gain
could falsely trip the protection latch. R1 and Q1 are added
reduce the sensitivity to low level currents in the opto-coupler.
Using the values of Figure 14, the opto-coupler collector cur-
rent must equal V
BE(Q1) / R1 = 350 A before OVP latches.
Once the controller has switched to standby mode, the out-
puts no longer switch but the VCC and REF regulators con-
tinue functioning and supply bias to the external circuitry. VCC
must fall below 6.2V or the UVLO pin must fall below 0.4V to
clear the OVP latch.
23
www.national.com
LM5035A/LM5035A-1
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參數(shù)描述 |
|---|---|
| LM5035AMH-1/NOPB | 功能描述:電壓模式 PWM 控制器 100V Hb Pwm W/Driver RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5035AMHX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PWM Controller with Integrated Half-Bridge and SyncFET PWM Controller with Integrated Half-Bridge and SyncFET |
| LM5035AMHX/NOPB | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| LM5035AMHX-1 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PWM Controller with Integrated Half-Bridge and SyncFET PWM Controller with Integrated Half-Bridge and SyncFET |
| LM5035AMHX-1/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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