參數(shù)資料
型號： PM6675
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, VFQFPN-24
文件頁數(shù)： 9/47頁
文件大?。?/td> 650K
代理商： PM6675
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
PM6675
Device description
17/47
6.1.1
Constant-On-Time architecture
shows the simplified block diagram of the Constant-On-Time controller.
The switching regulator of the PM6675 controls a one-shot generator that initiates the high-
side MOSFET when the following conditions are simultaneously satisfied: the PWM
comparator is high (i.e. output voltage is lower than Vr = 0.6V), the synchronous rectifier
current is below the current limit threshold and the minimum off-time has expired.
A minimum Off-Time contraint (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 = 0.6V), the low-side MOSFET is turned off according to the anti-cross conduction logic
once again, and a new cycle begins.
Figure 6.
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
0.6V
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
VSEL
VSEL<4V
1-Shot generator
Ton
VSNS
VOSC
0.6V
100uA
500mV
2.5V
+
-
+
HGATE
VREF
SGND
VOSC
VCC
+
-
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
0.6V
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
VSEL
VSEL<4V
1-Shot generator
Ton
VSNS
VOSC
0.6V
100uA
500mV
2.5V
+
-
+
HGATE
VREF
SGND
VOSC
VCC
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相關代理商/技術(shù)參數(shù)
參數(shù)描述
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