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參數(shù)資料
| 型號： | TPS40101RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | PLASTIC, QFN-24 |
| 文件頁數(shù)： | 19/37頁 |
| 文件大小： | 774K |
| 代理商： | TPS40101RGET |
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t
RESTART +
3.3
C
SS
I
SSDIS
(s)
(31)
UVLO Programming
5
UVLO
1.33 V
+
TPS40100
UDG04139
10
A
R1
R2
UVLO
R
1 +
V
HYST
I
UVLO
W
(32)
R
2 +
V
UVLO
R
1
V
ON * VUVLO * R1
I
UVLO
W
(33)
SLUS726 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
MOSFET and the low-side MOSFET. The soft-start capacitor is then discharged at 25% of the charge rate
during an overcurrent condition and the converter remains idle until the soft start pin reaches 200 mV, at which
point the soft-start circuit starts charging again and the converter attempts to restart. In normal operation, the
soft-start capacitor is charged to approximately 3.5 V when an initial fault is applied to the output. This means
that the minimum time before the first restart attempt is:
where
t
RESTART is the initial restart time (s)
C
SS is soft start capacitance (F)
I
SSDIS is the soft start discharge current – 5 A
If the output fault is persistent, and an overcurrent is declared on the restart, both of the MOSFETs are turned
off and the soft-start capacitor continues to charge to 3.5 V and then discharge to 200 mV before another restart
is attempted.
The TPS40101 provides the user with programmable UVLO level and programmable hysteresis. The UVLO
detection circuit schematic is described in Figure 37 from a functional perspective.
Figure 37. UVLO Circuit Functional Diagram
To program this circuit, first select the amount of hysteresis (the difference between the startup voltage and the
shutdown voltage) desired:
Then select the turn-on voltage and solve for R2.
where
V
HYST is the desired level of hysteresis in the programmable UVLO circuit
I
UVLO is the undervoltage lockout circuit hysteresis current (10 A typ)
V
UVLO is the UVLO comparator threshold voltage (1.33 V typ)
26
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| TPS40101RGETG4 | 功能描述:DC/DC 開關(guān)控制器 Mid Range Input Synch Buck Cntrlr 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 |
| TPS40-11 | 制造商:TOTAL-POWER 制造商全稱:TOTAL-POWER 功能描述:40 WATT OPEN - FRAME SWITCHING POWER SUPPLY |
| TPS40-12 | 制造商:TOTAL-POWER 制造商全稱:TOTAL-POWER 功能描述:40 WATT OPEN - FRAME SWITCHING POWER SUPPLY |
| TPS40120 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VRM10.0 COMPLIANT PROGRAMMABLE FEEDBACK DIVIDER |
| TPS40120PW | 功能描述:DC/DC 開關(guān)控制器 Programable Feedback Divider 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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