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参数资料
| 型号： | TPS62354YZGT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.6 A SWITCHING REGULATOR, 3350 kHz SWITCHING FREQ-MAX, BGA12 |
| 封装： | GREEN, DSBGA-12 |
| 文件页数： | 17/46页 |
| 文件大小： | 1530K |
| 代理商： | TPS62354YZGT |
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Enable
Voltage and Mode Selection
Undervoltage Lockout
Short-Circuit Protection
Thermal Shutdown
SLVS540E – MAY 2006 – REVISED APRIL 2008 .............................................................................................................................................................. www.ti.com
This mechanism is used to limit the output current under short-circuit conditions. Therefore, the start-up time
depends on the output capacitor and load current.
The device starts operation when EN pin is set high and starts up with the soft start. This signal is gated by the
EN_DCDC bit defined in register VSEL0 and VSEL1. On rising edge of the EN pin, all the registers are reset with
their default values. Enabling the converter's operation via the EN_DCDC bit does not affect internal register
settings. This allows the output voltage to be programmed to other values than the default voltage before starting
up the converter. For more details, see the VSEL0/1 register description.
Pulling the EN pin, VSEL0[6] bit or VSEL1[6] bit low forces the device into shutdown, with a shutdown current as
defined in the electrical characteristics table. In this mode, the P and N-channel MOSFETs are turned off, the
internal resistor feedback divider is disconnected, and the entire internal-control circuitry is switched off. When an
output voltage is present during shutdown mode, which is caused by an external voltage source or super
capacitor, the reverse leakage is specified under electrical characteristics. For proper operation, the EN pin must
be terminated and must not be left floating.
In addition, depending on the setting of CONTROL2[6] bit, the device can actively discharge the output capacitor
when it turns off. The integrated discharge resistor has a typical resistance of 15
. The required time to
discharge the output capacitor at VO depends on load current and the output capacitance value.
The TPS6235x features a pin-selectable output voltage. VSEL is primarily used to scale the output voltage
between active (VSEL=HIGH) and sleep mode (VSEL=LOW). For maximum flexibility, it is possible to reprogram
the operating mode of the converter (e.g. fixed frequency PWM, fast PFM or light PFM) associated with VSEL
signal via the I2C interface
VSEL output voltage and mode selection is defined as following:
VSEL = LOW: DC/DC output voltage determined by VSEL0 register value. DC/DC mode of operation is
determined by MODE0 bit in CONTROL1 register
VSEL = HIGH: DC/DC output voltage determined by VSEL1 register value. DC/DC mode of operation is
determined by MODE1 bit in CONTROL1 register.
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions.
As soon as the output voltage falls below 50% of the nominal output voltage, the converter current limit is
reduced by 50% of the nominal value. Because the short-circuit protection is enabled during start-up, the device
does not deliver more than half of its nominal current limit until the output voltage exceeds 50% of the nominal
output voltage. This needs to be considered when a load acting as a current sink is connected to the output of
the converter.
As soon as the junction temperature, TJ, exceeds 150°C typical, the device goes into thermal shutdown. In this
mode, the P- and N-channel MOSFETs are turned off. The device continues its operation when the junction
temperature falls below 130
°C typical again.
24
Copyright 2006–2008, Texas Instruments Incorporated
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| TPS62355DRCT | 制造商:Texas Instruments 功能描述:CONV DC-DC SGL-OUT STEP DOWN 10PIN SON EP - Tape and Reel |
| TPS62356YZGR | 功能描述:直流/直流开关调节器 1A 3MHz Buck Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62356YZGT | 功能描述:直流/直流开关调节器 1A 3MHz Buck Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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