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參數(shù)資料
| 型號： | L6726ATR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Single phase PWM controller |
| 中文描述： | 單相PWM控制器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 399K |
| 代理商： | L6726ATR |
L6726A
Application details
15/24
8
Application details
8.1
Output voltage selection
L6726A is capable to precisely regulate an output voltage as low as 0.8V. In fact, the device
comes with a fixed 0.8V internal reference that guarantees the output regulated voltage to
be within ±1% tolerance over line and temperature variations (excluding output resistor
divider tolerance, when present).
Output voltage higher than 0.8V can be achieved by adding a resistor R
OS
between FB pin
and ground. Referring to
Figure 1
, the steady state DC output voltage will be:
where V
REF
is 0.8V.
8.2
Compensation network
The control loop shown in
Figure 8
is a voltage mode control loop. The error amplifier is a
transconductance type with fixed gain (3.3mS typ.). The FB voltage is regulated to the
internal reference, thus the output voltage is fixed accordingly to the output resistor divider
(when present).
Transconductance error amplifier output current generates a voltage across Z
F
, which is
compared to oscillator saw-tooth waveform to provide PWM signal to the driver section.
PWM signal is then transferred to the switching node with V
IN
amplitude. This waveform is
filtered by the output filter.
Figure 8.
PWM control loop
The converter transfer function is the small signal transfer function between the voltage at
the output node of the EA (COMP) and V
OUT
. This function has a double pole (complex
conjugate) at frequency F
LC
depending on the L-C
OUT
resonance and a zero at F
ESR
V
OUT
V
REF
1
R
R
OS
----------
+
=
L
R
C
OUT
ESR
R
FB
OSC
V
IN
V
OSC
+
+
_
_
V
OUT
V
REF
Z
F
OUTPUT
DIVIDER
PWM
COMPARATOR
OTA
R
F
C
F
C
P
R
OS
FB
COMP
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| L6726-D18-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-D18-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-S18-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-S18-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726L-D18-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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