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參數資料
| 型號： | L6910 |
| 廠商： | 意法半導體 |
| 英文描述： | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| 中文描述： | 可調降壓控制器采用同步整流 |
| 文件頁數： | 6/21頁 |
| 文件大?。?/td> | 453K |
| 代理商： | L6910 |
L6910A L6910
6/21
Soft Start
At start-up a ramp is generated charging the external capacitor C
SS
with an internal current generator. The initial
value for this current is of 35
μ
A and speeds-up the charge of the capacitor up to 0.5V. After that it becames
10
μ
A until the final charge value of approximatively 4V.
When the voltage across the soft start capacitor (V
SS
) reaches 0.5V the lower power MOS is turned on to dis-
charge the output capacitor. As V
SS
reaches 1.1V (i.e. the oscillator triangular wave inferior limit) also the upper
MOS begins to switch and the output voltage starts to increase.
No switching activity is observable if SS is kept lower than 0.5V and both mosfets are off.
If VCC and OCSET pins are not above their own turn-on thresholds and V
EAREF
is not above 650mV, the Soft-
Start will not take place, and the relative pin is internally shorted to GND. During normal operation, if any under-
voltage is detected on one of the two supplies, the SS pin is internally shorted to GND and so the SS capacitor
is rapidly discharged.
Figure 2. Soft Start (with Reference Present)
Driver Section
The driver capability on the high and low side drivers allows using different types of power MOS (also multiple
MOS to reduce the R
DSON
), maintaining fast switching transition.
The low-side mos driver is supplied directly by Vcc while the high-side driver is supplied by the BOOT pin.
Adaptative dead time control is implemented to prevent cross-conduction and allow to use several kinds of mos-
fets. The upper mos turn-on is avoided if the lower gate is over about 200mV while the lower mos turn-on is
avoided if the PHASE pin is over about 500mV. The lower mos is in any case turned-on after 200ns from the
high side turn-off.
The peak current is shown for both the upper (fig. 3) and the lower (fig. 4) driver at 5V and 12V. A 3.3nF capac-
itive load has been used in these measurements.
For the lower driver, the source peak current is 1.1A @ V
CC
= 12V and 500mA @ V
CC
= 5V, and the sink peak
current is 1.3A @ V
CC
= 12V and 500mA @ V
CC
= 5V.
Similarly, for the upper driver, the source peak current is 1.3A @ Vboot-Vphase = 12V and 600mA @ Vboot-
Vphase = 5V, and the sink peak current is 1.3A @ Vboot-Vphase =12V and 550mA @ Vboot-Vphase = 5V.
Timing Diagram
Vcc Turn-on threshold
Vin Turn-on threshold
0.5V
1V
Vcc
Vin
Vss
LGATE
Vout
to GND
Acquisition: CH1 = PHASE; CH2 = V
out
;
CH3 = PGOOD; CH4 = V
ss
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| L6910A | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| L6910ATR | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| L6910TR | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| L6911D | 5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L6910_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| L6910A | 功能描述:DC/DC 開關控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6910ATR | 功能描述:DC/DC 開關控制器 5.0 to 12V Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6910G | 功能描述:電壓模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| L6910GTR | 功能描述:電壓模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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