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參數(shù)資料
| 型號： | TLV62065DSGT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, PLASTIC, WSON-8 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大小： | 1182K |
| 代理商： | TLV62065DSGT |
www.ti.com
SLVSAC4 – NOVEMBER 2010
Connecting this pin to GND enables the Power Save Mode with automatic transition between PWM and PFM
mode. Pulling the MODE pin high forces the converter to operate in fixed frequency PWM mode even at light
load currents. This allows simple filtering of the switching frequency for noise sensitive applications. In this mode,
the efficiency is lower compared to the power save mode during light loads.
The condition of the MODE pin can be changed during operation and allows efficient power management by
adjusting the operation mode of the converter to the specific system requirements.
ENABLE
The device is enabled by setting EN pin to high. At first, the internal reference is activated and the internal
analog circuits are settled. Afterwards, the soft start is activated and the output voltage is ramped up. The output
voltages reaches 95% of its nominal value within tSTARTof typically 500 s after the device has been enabled. 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 and the SW pin is
connected to PGND via an internal resistor to discharge the output.
SOFT START
The TLV62065 has an internal soft start circuit that controls the ramp up of the output voltage. Once the
converter is enabled and the input voltage is above the undervoltage lockout threshold VUVLOthe output voltage
ramps up from 5% to 95% of its nominal value within tRamp of typ. 250s.
This limits the inrush current in the converter during start up and prevents possible input voltage drops when a
battery or high impedance power source is used.
During soft start, the switch current limit is reduced to 1/3 of its nominal value ILIMF until the output voltage
reaches 1/3 of its nominal value. Once the output voltage trips this threshold, the device operates with its
nominal current limit ILIMF.
INTERNAL CURRENT LIMIT / FOLD-BACK CURRENT LIMIT FOR SHORT-CIRCUIT PROTECTION
During normal operation the High-Side and Low-Side MOSFET switches are protected by its current limits ILIMF.
Once the High-Side MOSFET switch reaches its current limit, it is turned off and the Low-Side MOSFET switch is
turned on. The High-Side MOSFET switch can only turn on again, once the current in the Low -Side MOSFET
switch decreases below its current limit ILIMF. The device is capable to provide peak inductor currents up to its
internal current limit ILIMF..
As soon as the switch current limits are hit and the output voltage falls below 1/3 of the nominal output voltage
due to overload or short circuit condition, the foldback current limit is enabled. In this case the switch current limit
is reduced to 1/3 of the nominal value ILIMF.
Due to the short-circuit protection is enabled during start-up, the device does not deliver more than 1/3 of its
nominal current limit ILIMF until the output voltage exceeds 1/3 of the nominal output voltage. This needs to be
considered when a load is connected to the output of the converter, which acts as a current sink.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds 150°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 with a softstart
once the junction temperature falls below the thermal shutdown hysteresis.
Copyright 2010, Texas Instruments Incorporated
15
Product Folder Link(s) :TLV62065
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