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參數資料
| 型號： | PM6670 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFN-24 |
| 文件頁數： | 15/53頁 |
| 文件大?。?/td> | 799K |
| 代理商： | PM6670 |
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Device description
PM6670
22/53
7.1.1
Constant-On-Time architecture
shows the simplified block diagram of the Constant-On-Time controller.
The switching regulator of the PM6670 owns a one-shot generator that ignites the high-side
MOSFET when the following conditions are simultaneously satisfied: the PWM comparator
is high (i.e. output voltage is lower than Vr = 0.9V), the synchronous rectifier current is below
the current limit threshold and the minimum off-time has expired.
A minimum Off-Time constraint (300ns typ.) is introduced to assure the boot capacitor
charge and allow inductor valley current sensing on low-side MOSFET. A minimum On-Time
is also introduced to assure the start-up switching sequence.
Once the On-Time has timed out, the high side switch is turned off, while the synchronous
rectifier is ignited according to the anti-cross conduction management circuitry.
When the output voltage reaches the valley limit (determined by internal reference
Vr = 0.9V), the low-side MOSFET is turned off according to the anti-cross conduction logic
once again, and a new cycle begins.
Figure 30. Switching section simplified block diagram
+
-
HS
driver
Level
shifter
LS
driver
Q
R
S
Ton
Ton--min
min
Anti cross-
conduction
circuitry
Toff
Toff--min
min
Q
R
S
+
-
PWM Comparator
Positive Current Limit comparator
0.9V
Q
R
S
+
_
Min
Min fsw
fsw
counter
Zero
Zero--crossing
crossing
Comparator
bandgap
1.236V
PHASE
PGND
LGATE
BOOT
CSNS
+
-
COMP
gm
Integrator
VSNS
VBG
PULSE
PULSE -- SKIP
SKIP
MODE
MODE<4V
1-Shot generator
Ton
VSNS
VOSC
DDRSEL
0.9V
100uA
500mV
2.5V
+
-
+
HGATE
VREF
SGND
VOSC
VCC
相關PDF資料 |
PDF描述 |
|---|---|
| PM6675ASTR | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6675AS | 3 A SWITCHING CONTROLLER, QCC24 |
| PM6675ATR | SWITCHING CONTROLLER, QCC24 |
| PM6675TR | SWITCHING CONTROLLER, QCC24 |
| PM6675 | SWITCHING CONTROLLER, QCC24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PM6670AS | 功能描述:DC/DC 開關控制器 DDR 2/3 Memory Pwr Cntrl 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 |
| PM6670ASTR | 功能描述:直流/直流開關調節(jié)器 Complete DDR2/3 Mem Pwr supply controllr 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6670ATR | 功能描述:直流/直流開關調節(jié)器 Complete DDR2/3 Mem Pwr supply controllr 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| PM6670S | 功能描述:DC/DC 開關控制器 DDR 2/3 Memory Pwr Cntrl 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 |
| PM6670STR | 功能描述:DC/DC 開關控制器 Complete DDR2/3 Mem Pwr supply controllr 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 |
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