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參數(shù)資料
| 型號(hào)： | L6611D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 5-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | SOP-20 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大小： | 662K |
| 代理商： | L6611D |
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19/28
L6611
pin#3) drives the external circuitry that biases the magamp core. Between these pins it is connected
the compensation network (ZC). The maximum positive output voltage is clamped at about 3.5V to
improve response time.
The feedback control circuit determines the magamp "off" time, converting the voltage at the output
of error amplifier into a current IR, which resets the magamp. If the output voltage exceeds its preset
value, V(Bout) decreases; this causes a higher voltage across RC which, in turn, implies a larger volt-
age across RE and a larger reset current IR (VBE of Q1 is supposed constant). A larger IR causes the
PWM waveform across D2 to get narrower. This pulls the output voltage back to the desired level and
achieves regulation.
It is possible to use this section to drive a pass transistor to obtain 3.3V with a linear regulator; in the
"Application idea" section an example is showed to implement this solution.
Figure 16. Magamp control feedback section
– Auxiliary section, error amplifier C.
This section (fig. 17) provides the feedback signal for the auxiliary converter following the same oper-
ating principles as the Main section. The auxiliary output voltage (Vaux) is often defined as "Standby
voltage" because the converter remains alive during standby condition (the Main converter is stopped)
to supply the chip and all the ancillary circuits. Typical values for its output voltage are 5V or 3.3V.
The inverting input (Cinv, pin#7) is connected to the output voltage through an external resistor divider
whereas the non-inverting one is connected to a 1.25V trimmable internal voltage reference (see "On
board trimming and mode operating" paragraph).
The compensation network Zc(aux) is placed between E/A inverting input and output pins.
When Dmon recognizes an undervoltage condition on the auxiliary output, an internal n-channel MOS
(in open drain configuration) grounds E/A output pin; the high current flowing through the optocoupler
is then transferred to the primary side causing a duty cycle as short as possible; this prevents a high
energy transfer from primary to secondary under short circuit conditions, thus reducing the thermal
stress on the power components.
Figure 17. Auxiliary feedback section
+3.3V
Zc
Bout
Binv
+1.25V
R
L
R
H
_
+
L6611
magamp
R
C
R
S
R
E
D
1
I
R
D
2
V
D2
Q
1
L
C
+3.3V
Zc
Bout
Binv
+1.25V
R
L
R
H
_
+
L6611
magamp
R
C
R
S
R
E
D
1
I
R
D
2
V
D2
Q
1
L
C
V
AUX
to AUX
control
Zc(aux)
Cout
Cinv
R
B
+1.25V
R
H
R
L
_
+
L6611
OCP bounce
GND
DMON
V
AUX
to AUX
control
Zc(aux)
Cout
Cinv
R
B
+1.25V
R
H
R
L
_
+
L6611
OCP bounce
GND
DMON
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PDF描述 |
|---|---|
| L6611N | 5-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP20 |
| L6668TR | 0.8 A SWITCHING CONTROLLER, 105 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6701TR | 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36 |
| L6712DTR | 2 A SWITCHING CONTROLLER, PDSO28 |
| L6712Q | 2 A SWITCHING CONTROLLER, QCC36 |
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