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参数资料
| 型号： | PM6675S |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件页数： | 16/53页 |
| 文件大小： | 2632K |
| 代理商： | PM6675S |
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PM6675S
Device description
23/53
7.1.2
Output ripple compensation and loop stability
The loop is closed connecting the center tap of the output divider (internally, when the fixed
output voltage is chosen, or externally, using the VSEL pin in the adjustable output voltage
mode). The feedback node is the negative input of the error comparator, while the positive
input is internally connected to the reference voltage (Vr = 0.6 V). When the feedback
voltage becomes lower than the reference voltage, the PWM comparator goes to high and
sets the control logic, turning on the high-side MOSFET. After the On-Time (calculated as
previously described), the system releases the high-side MOSFET and turns on the
synchronous rectifier.
The voltage drop along ground and supply PCB paths, used to connect the output capacitor
to the load, is a source of DC error. Furthermore the system regulates the output voltage
valley, not the average, as shown in Figure 37. Thus, the voltage ripple on the output
capacitor is an additional source of DC error. To compensate this error, an integrative
network is introduced in the control loop, by connecting the output voltage to the COMP pin
Figure 34.
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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