參數(shù)資料
型號(hào)： PM6670TR
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(yè)數(shù)： 15/55頁(yè)
文件大?。?/td> 849K
代理商： PM6670TR
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(guān)PDF資料
PDF描述
PM6670ATR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670 1.4 A SWITCHING CONTROLLER, QCC24
PM6675ASTR 3 A SWITCHING CONTROLLER, QCC24
PM6675AS 3 A SWITCHING CONTROLLER, QCC24
PM6675ATR SWITCHING CONTROLLER, QCC24
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