欧美成人免费电影,国产欧美一区二区三区精品酒店,精品国产a毛片,色网在线免费观看

參數(shù)資料
型號: TPS54612PWP
英文描述: Analog IC
中文描述: 模擬IC
文件頁數(shù): 7/16頁
文件大小: 260K
代理商: TPS54612PWP
TPS54611, TPS54612, TPS54613
TPS54614, TPS54615, TPS54616
SLVS400A
AUGUST 2001
REVISED JANUARY 2002
7
www.ti.com
detailed description
under voltage lock out (UVLO)
The TPS5461x incorporates an under voltage lockout circuit to keep the device disabled when the input voltage
(VIN) is insufficient. During power up, internal circuits are held inactive until VIN exceeds the nominal UVLO
threshold voltage of 2.95 V. Once the UVLO start threshold is reached, device start-up begins. The device
operates until VIN falls below the nominal UVLO stop threshold of 2.8 V. Hysteresis in the UVLO comparator,
and a 2.5-
μ
s rising and falling edge deglitch circuit reduce the likelihood of shutting the device down due to noise
on VIN.
slow-start/enable (SS/ENA)
The slow-start/enable pin provides two functions. First, the pin acts as an enable (shutdown) control by keeping
the device turned off until the voltage exceeds the start threshold voltage of approximately 1.2 V. When SS/ENA
exceeds the enable threshold, device start up begins. The reference voltage fed to the error amplifier is linearly
ramped up from 0 V to 0.891 V in 3.35 ms. Similarly, the converter output voltage reaches regulation in
approximately 3.35 ms. Voltage hysteresis and a 2.5-
μ
s falling edge deglitch circuit reduce the likelihood of
triggering the enable due to noise. Refer to the following table for start up times for each device
DEVICE
OUTPUT VOLTAGE
SLOW-START
DEVICE
OUTPUT VOLTAGE
SLOW-START
TPS54611
0.9 V
3.3 ms
TPS54614
1.8 V
3.3 ms
TPS54612
1.2 V
4.5 ms
TPS54615
2.5 V
4.7 ms
TPS54613
1.5 V
5.6 ms
TPS54616
3.3 V
6.1 ms
The second function of the SS/ENA pin provides an external means for extending the slow-start time with a
ceramic capacitor connected between SS/ENA and AGND. Adding a capacitor to the SS/ENA pin has two
effects on start-up. First, a delay occurs between release of the SS/ENA pin and start-up of the output. The delay
is proportional to the slow-start capacitor value and lasts until the SS/ENA pin reaches the enable threshold.
The start-up delay is approximately:
td
C(SS)
1.2 V
5
A
Second, as the output becomes active, a brief ramp up at the internal slow-start rate may be observed before
the externally set slow-start rate takes control and the output rises at a rate proportional to the slow-start
capacitor. The slow-start time set by the capacitor is approximately:
t(SS)
C(SS)
0.7 V
5
A
The actual slow-start time is likely to be less than the above approximation due to the brief ramp up at the internal
rate.
VBIAS regulator
The VBIAS regulator provides internal analog and digital blocks with a stable supply voltage over variations in
junction temperature and input voltage. A high quality, low-ESR, ceramic bypass capacitor is required on the
VBIAS pin. X7R or X5R grade dielectrics are recommended because their values are more stable over
temperature. The bypass capacitor should be placed close to the VBIAS pin and returned to AGND.
External loading on VBIAS is allowed, with the caution that internal circuits require a minimum VBIAS of 2.7 V,
and external loads on VBIAS with ac or digital switching noise may degrade performance. The VBIAS pin may
be useful as a reference voltage for external circuits.
voltage reference
The voltage reference system produces a precise, temperature-stable voltage from a bandgap circuit. A scaling
amplifier and DAC are then used to produce the reference voltages for each of the fixed output devices.
(1)
(2)
相關(guān)PDF資料
PDF描述
TPS54612PWPR Analog IC
TPS54613PWP Analog IC
TPS54613PWPR Analog IC
TPS54614PWP Analog IC
TPS54614PWPR Analog IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54612PWP 制造商:Texas Instruments 功能描述:BUCK PWM REG FET 6A SMD 54612
TPS54612PWPG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Lo-In Voltage 6A Sync Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54612PWPR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Lo-In Voltage 6A Sync Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54612PWPRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Lo-In Voltage 6A Sync Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54612-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 6-V INPUT, 6-A OUTPUT SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs(SWIFT)
主站蜘蛛池模板: 磐石市| 壤塘县| 蓝田县| 张家川| 柳河县| 乃东县| 伽师县| 麻栗坡县| 新竹县| 渭南市| 红安县| 华安县| 江华| 张家界市| 上思县| 白沙| 龙江县| 云安县| 双柏县| 体育| 天祝| 满洲里市| 景洪市| 准格尔旗| 东乡县| 平和县| 古蔺县| 加查县| 沙坪坝区| 木里| 乡城县| 理塘县| 龙门县| 兰考县| 开封县| 新竹市| 罗江县| 海城市| 桐梓县| 抚州市| 沙坪坝区|