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參數資料
| 型號： | TPS62590DRVT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.80 MM HEIGHT, PLASTIC, SON-6 |
| 文件頁數： | 5/24頁 |
| 文件大小： | 619K |
| 代理商： | TPS62590DRVT |
SLVS897B
– JANUARY 2009 – REVISED APRIL 2011
ENABLE
The device is enabled setting EN pin to high. During the start up time tStart Up the internal circuits are settled.
Afterwards, the device activates the soft start circuit. The EN input can be used to control power sequencing in a
system with various dc/dc converters. The EN pin can be connected to the output of another converter, to drive
the EN pin high and getting a sequencing of supply rails. With EN = GND, the device enters shutdown mode. In
this mode, all circuits are disabled. In fixed output voltage versions, the internal resistor divider network is
disconnected from FB pin.
SOFT START
The TPS62590 has an internal soft start circuit that controls the ramp up of the output voltage. The output
voltage ramps up from 5% to 95% of its nominal value within typical 250
μs. This limits the inrush current in the
converter during ramp up and prevents possible input voltage drops when a battery or high impedance power
source is used. The soft start circuit is enabled within the start up time tStart Up.
SHORT-CIRCUIT PROTECTION
The High-Side and Low-Side MOSFET switches are short-circuit protected with maximum switch current = ILIMF.
The current in the switches is monitored by current limit comparators. Once the current in the High-Side
MOSFET switch exceeds the threshold of its current limit comparator, it turns off and the Low-Side MOSFET
switch is activated to ramp down the current in the inductor and High-Side MOSFET switch. The High-Side
MOSFET switch can only turn on again, once the current in the Low-Side MOSFET switch has decreased below
the threshold of its current limit comparator.
THERMAL SHUTDOWN
As soon as the junction temperature TJ exceeds 140°C (typical) the device goes into thermal shutdown. In this
mode, the High-Side and Low-Side MOSFETs are turned-off. The device continues its operation when the
junction temperature falls below the thermal shutdown hysteresis.
Copyright
2009–2011, Texas Instruments Incorporated
13
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