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參數(shù)資料
| 型號： | TPS62020DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER |
| 中文描述： | 600 mA/1.25兆赫高效降壓型轉換器 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 425K |
| 代理商： | TPS62020DRC |
www.ti.com
SOFTSTART
The TPS62020 series has an internal softstart circuit that limits the inrush current during start-up. This prevents
possible voltage drops of the input voltage in case a battery or a high impedance power source is connected to
the input of the TPS62020.
SHORT-CIRCUIT PROTECTION
As soon as the output voltage falls below 50% of the nominal output voltage, the converter switching frequency
as well as the current limit is reduced to 50% of the nominal value. Since 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 in case a load acting as a current sink
is connected to the output of the converter.
THERMAL SHUTDOWN
As soon as the junction temperature of typically 150
°
C is exceeded the device goes into thermal shutdown. In
this mode, the P-Channel switch and N-Channel rectifier are turned off. The device continues its operation when
the junction temperature falls below typically 150
°
C again.
ENABLE
Pulling the EN low forces the part into shutdown mode, with a shutdown current of typically 0.1 μA. In this mode,
the P-Channel switch and N-Channel rectifier are turned off and the whole device is in shut down. If an output
voltage is present during shut down, which could be an external voltage source or super cap, the reverse
leakage current is specified under electrical parameter table. For proper operation the enable (EN) pin must be
terminated and should not be left floating.
UNDERVOLTAGE LOCKOUT
The undervoltage lockout circuit prevents device misoperation at low input voltages. It prevents the converter
from turning on the switch or rectifier MOSFET with undefined conditions.
TPS62020, TPS62021
SLVS076B–JUNE 2003–REVISED APRIL 2004
DETAILED DESCRIPTION (continued)
R
L
= DC resistance of the inductor
V
O
max = nominal output voltage plus maximum output voltage tolerance
The softstart is implemented with a digital circuit increasing the switch current in steps of typically I
LIM
/8, I
LIM
/4,
I
LIM
/2 and then the typical switch current limit of 1.1 A as specified in the electrical parameter table. The start-up
time mainly depends on the output capacitor and load current, see Figure 13.
Pulling EN high starts up the device with the softstart as described under the section Softstart.
11
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| TPS62020DRCR | 功能描述:直流/直流開關調節(jié)器 Adj 600mA Hi-Eff Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62020DRCRG4 | 功能描述:直流/直流開關調節(jié)器 Adj 600mA Hi-Eff Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62020EVM-019 | 功能描述:電源管理IC開發(fā)工具 TPS62020-019 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS62021DGQR | 功能描述:直流/直流開關調節(jié)器 Adj 600mA Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62021DGQRG4 | 功能描述:直流/直流開關調節(jié)器 Adj 600mA Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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