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參數(shù)資料
| 型號(hào)： | TPS5103DB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER |
| 中文描述： | 多模同步DC / DC控制器 |
| 文件頁數(shù)： | 4/37頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | TPS5103DB |
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TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240 – SEPTEMBER 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
REF
The reference voltage is used for the output voltage setting and the voltage protection(COMP). The tolerance
is 1.5% typically.
VREF5
An internal linear voltage regulator is used for the high-side driver bootstrap voltage. Since the input voltage
range is from 4.5 V to 25 V, this voltage offers a fixed voltage for the bootstrap voltage so that the design for
the bootstrap is much easier. The tolerance is 6%.
hysteretic comparator
The hysteretic comparator is used to regulate the output voltage of the synchronous-buck converter. The
hysteresis is set internally and is typically 9.7 mV. The total delay time from the comparator input to the driver
output is typically 400 ns for going both high and low.
error amplifier
The error amplifier is used to sense the output voltage of the synchronous buck converter. The negative input
of the error amplifier is connected to the Vref voltage(1.185 V) with a resistive divider network. The output of
the error amplifier is brought out to the FB terminal to be used for loop gain compensation.
low-side driver
The low-side driver is designed to drive low-Rds(on) n-channel MOSFETs. The maximum drive voltage is 5 V
from VREF5. The current rating of driver is typically 1.2 A at sink current, –1.5 A at source current.
high-side driver
The high-side driver is designed to drive low-Rds(on) n-channel MOSFETs. The current rating of the driver is
1.2 A at sink current, –1.7 A at source current. When configured as a floating driver, the bias voltage to the driver
is developed from the VREF5, limiting the maximum drive voltage between OUT_u and LL to 5 V. The maximum
voltage that can be applied between LH and OUTGND is 30 V.
driver deadtime control
The d
eadtime control prevents shoot-through current from flowing through the main power FETs. During
switching transitions the
d
eadtime control actively controls the turnon time of the MOSFET drivers. The typical
deadtime from the low-side-driver-off to the high-side-driver-on is 90 ns, and 110 ns from high-side-driver-off
to low-side-driver-on.
COMP
COMP is designed for use with a regulation output monitor. COMP also functions as an internal comparator
used for any voltage protection such as the input under voltage protection. If the input voltage is lower than the
setpoint, the comparator turns off and prevents external parts from damage. The investing terminal of the
comparator is internally connected to REF(1.185
V).
current protection
Current protection is achieved by sensing the high-side power MOSFET drain-to-source voltage drop during
on-time through VCC_SENSE and LL terminals. An external resistor between Vin and TRIP terminal with the
internal current source connected to the current comparator negative input adjusts the current limit. The typical
internal current source value is 15
μ
A in PWM mode, 5
μ
A in SKIP mode. When the voltage on the positive
terminal is lower than the negative terminal, the current comparator turns on the trigger, and then activates the
oscillator. This oscillator repeatedly reset the trigger until the over current condition is removed. The capacitor
on the C
T
terminal can be open or added to adjust the reset frequency.
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| TPS5103EVM-136 | 功能描述:電源管理IC開發(fā)工具 PWM/Hysteretic Buck Contr RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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| TPS5103IDBG4 | 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS5103IDBR | 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS5103IDBRG4 | 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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