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參數資料
| 型號： | TPS40042DRCTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數： | 12/35頁 |
| 文件大?。?/td> | 746K |
| 代理商： | TPS40042DRCTG4 |
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DESCRIPTION (CONT.)
DEVICE RATINGS
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
SLUS777 – NOVEMBER 2007
One of three short circuit threshold levels may be selected by the addition of an external resistor from the COMP
pin to circuit ground (no resistor is the default setting). During power on, and before the internal soft start
commands the output voltage to rise, the TPS40042 enters a calibration cycle, measures the current out of the
COMP pin, and selects an internal SCP threshold voltage. At the end of the 1.5-ms calibration time, the output
voltage is allowed to enter soft-start. During operation, the selected SCP threshold voltage is compared to the
upper MOSFET’s voltage drop during its ON time to determine whether there is an overload condition. If the
voltage across the MOSFET exceeds the threshold voltage, the TPS40042 counts seven continuous pulses
before shutting completely OFF for seven soft start charge/discharge cycles, after which, the TPS40042 attempts
to restart the output.
During startup, both the high-side MOSFET switch and the synchronous rectifier are held in the OFF state until
the internal soft start commands an output voltage higher than the voltage currently at the output. This may
happen when the output is pre-biased at some voltage greater than zero and less than the desired regulation
voltage. When the internal soft start first commands the output to rise, the pulse width of the synchronous
rectifier is slowly increased from zero to the full 1-D conduction time by a number of discrete steps. In this way,
inductor current is not allowed to reverse quickly, and ensures a monotonic startup of the output whether the
output starts from zero or from a pre-bias level. If power is applied to the device while the EN (enable low) pin is
allowed to float high, the TPS40042 remains OFF. Only when the EN pin is pulled down towards ground is the
controller allowed to start.
ORDERING INFORMATION
OPERATING FREQUENCY
PACKAGE
TAPE AND REEL QTY.
PART NUMBER
600 kHz
Plastic 10-pin SON (DRC)
250
TPS40042DRCT
600 kHz
Plastic 10-pin SON (DRC)
3000
TPS40042DRCR
Over operating free-air temperature range (unless otherwise noted, all voltages are with respect to GND.)
PARAMETER
VALUE
UNIT
VDD
6.5
SW
-3 to 10.5
SW
transient (< 50 ns)
-5
BOOT
SW+6.5
V
HDRV
SW to SW+6.5
EN, FB, LDRV
-0.3 to 6.5
,REFIN
COMP
-0.3 to 3
Operating junction temperature
-40 to 150
°C
Storage junction temperature
-55 to 150
over operating free-air temperature range (unless otherwise noted)
PARAMETER
MIN
TYP
MAX
UNIT
VVDD
Input voltage to VDD pin
3.0
5.5
V
VREFIN
Voltage applied to REFIN pin during regulation
0.5
1.5
V
TJ
Junction temperature
-40
125
°C
2
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS40042
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| TPS40050PWPR | 功能描述:DC/DC 開關控制器 Wide Input Vltg Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40050PWPRG4 | 功能描述:DC/DC 開關控制器 Wide Input Vltg Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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