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參數(shù)資料
| 型號(hào)： | L6722 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36 |
| 封裝： | 6 X 6 MM, 1 MM PITCH, VFQFPN-36 |
| 文件頁數(shù)： | 6/34頁 |
| 文件大小： | 421K |
| 代理商： | L6722 |
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5 Driver section
L6722
14/34
5
Driver section
The integrated high-current drivers allow using different types of power MOS (also multiple
MOS to reduce the equivalent RdsON), maintaining fast switching transition.
The drivers for the high-side mosfets use BOOTx pins for supply and PHASEx pins for return.
The drivers for the low-side mosfets use the VCC pin for supply and PGND pin for return.
The controller embodies a anti-shoot-through and adaptive dead-time control to minimize low
side body diode conduction time maintaining good efficiency saving the use of Schottky diodes:
when the high-side mosfet turns off, the voltage on its source begins to fall; when the voltage
reaches 2V, the low-side mosfet gate drive is suddenly applied. When the low-side mosfet turns
off, the voltage at LGATEx pin is sensed. When it drops below 1V, the high-side mosfet gate
drive is suddenly applied. If the current flowing in the inductor is negative, the source of high-
side mosfet will never drop. To allow the low-side mosfet to turn-on even in this case, a
watchdog controller is enabled: if the source of the high-side mosfet doesn't drop, the low side
mosfet is switched on so allowing the negative current of the inductor to recirculate. This
mechanism allows the system to regulate even if the current is negative.
Power conversion input is flexible: 5V, 12V bus or any bus that allows the conversion (See
Section 7.3) can be chosen freely.
5.1
Power dissipation
L6722 embeds high current mosfet drivers for both high side and low side mosfets: it is then
important to consider the power that the device is going to dissipate in driving them in order to
avoid overcoming the maximum junction operative temperature. In addition, since the device
has an exposed pad to better dissipate the power, the thermal resistance between junction and
ambient consequent to the layout is also important: thermal pad need to be soldered to the
PCB ground plane through several VIAs in order to facilitate the heat dissipation.
Two main terms contribute in the device power dissipation: bias power and drivers' power.
●
Device Power (PDC) depends on the static consumption of the device through the supply
pins and it is simply quantifiable as follow (assuming to supply HS and LS drivers with the
same VCC of the device):
Figure 5.
Dissipated power
P
DC
V
CC
I
CC
3I
BOOTx
+
(
)
=
L6722; Rgate=0; Rmosfet=0
0
500
1000
1500
2000
2500
3000
3500
4000
50
100
150
200
250
300
350
400
450
500
550
Switching frequency [kHz] per phase
C
o
nt
ro
lle
rD
iss
ip
at
ed
P
o
w
er
[
m
W
]
HS=1xSTS12NH3LL; LS=1xSTS25NH3LL
HS=1xSTS12NH3LL; LS=2xSTS25NH3LL
HS=1xSTD55NH2LL; LS=1xSTD95NH02L
HS=2xSTD55NH2LL; LS=2xSTD95NH02L
L6722; Rhs=2.2; Rls=3.3; Rmosfet=1
0
500
1000
1500
2000
2500
3000
3500
4000
50
100
150
200
250
300
350
400
450
500
550
Switching Frequency per phase [kHz]
C
o
n
tro
ll
er
Di
ss
ip
at
ed
P
o
w
er
[
m
W
]
HS=1xSTS12NH3LL; LS=1xSTS25NH3LL
HS=1xSTS12NH3LL; LS=2xSTS25NH3LL
HS=1xSTD55NH22L; LS=1xSTD95NH02L
HS=2xSTD55NH22L; LS=2xSTD95NH02L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6722TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3 Phase Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6725 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Vltg Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6725_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Voltage mode PWM controller with bootstrap anti-discharging system |
| L6725A | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Vltg Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6725ATR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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