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参数资料
| 型号： | L6726ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 297 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 7/35页 |
| 文件大小： | 986K |
| 代理商： | L6726ATR |
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L6726A
Application details
Doc ID 12754 Rev 4
15/35
8
Application details
8.1
Output voltage selection
L6726A is capable to precisely regulate an output voltage as low as 0.8 V. In fact, the device
comes with a fixed 0.8 V internal reference that guarantees the output regulated voltage to
be within ±1% tolerance over line and temperature variations between 0 °C and 70 °C
(excluding output resistor divider tolerance, when present).
Output voltage higher than 0.8 V can be achieved by adding a resistor ROS between FB pin
and ground. Referring to Figure 1, the steady state DC output voltage will be:
where VREF is 0.8 V.
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 (3.3 ms 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 ZF, 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 VIN 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 VOUT. This function has a double pole (complex
conjugate) at frequency FLC depending on the L-COUT resonance and a zero at FESR
V
OUT
V
REF
1
R
FB
R
OS
-----------
+
=
L
R
C
OUT
ESR
R
FB
OSC
V
IN
ΔV
OSC
+
_
V
OUT
V
REF
ZF
OUTPUT
DIVIDER
PWM
COMPARATOR
OTA
R
F
C
F
C
P
ROS
FB
COMP
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相关代理商/技术参数 |
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| L6726-D18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-D18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-S18-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-S18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726L-D18-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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