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参数资料
| 型号： | APW7066RC-TRL |
| 厂商： | ANPEC ELECTRONICS CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Dual Synchronous Buck PWM Controllers and One Linear Controller |
| 中文描述： | SWITCHING CONTROLLER, PDSO24 |
| 封装： | LEAD FREE, MO-153ADT, TSSOP-24 |
| 文件页数： | 16/33页 |
| 文件大小： | 338K |
| 代理商： | APW7066RC-TRL |
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Copyright
ANPEC Electronics Corp.
Rev. A.7 - Mar., 2008
APW7066
23
Short-Circuit Protection
The APW7066 has a simple short-circuit protection to
monitor COMP1 and COMP2 for VOUT1/2. When
output voltage has a short, the FB pin should start to
follow output, since it is a resistor divider from the
output. The FB is the inverting input of Error-Amp,
when FB pin is lower than the Error-Amp reference,
then the COMP will rise to increase the duty-cycle of
Function Description (Cont.)
SYNC (Cont.)
External Clock (10V/div)
LGATE1 (10V/div)
UGATE1 (10V/div)
LGATE2 (10V/div)
Time (0.5u/div)
Figure7. The switching timing of
synchronization function
Figure 8. The timing chart of synchroni-
zation function
the upper MOSFET gate driver, this allows output to
get higher voltage. If the short-circuit condition is long
enough, the COMP pin will exceed the trip point 3.3V,
and the duty circle will hit the maximum. This means
that either Over-Current or Under-Voltage condition is
detected. If any of the COMP1 and COMP2 exceeds
their trip points, and holds over a filter time (1-2 clock
cycle of switching frequency), then all regulators will
shut down, and require a POR on either of VCC or
VCC12 to restart. Note that the linear regulator has no
short-circuit protection.
Output Voltage Setting
The output voltage can be adjusted with a resistive
divider, from output voltage to FB pin to the ground.
Use 1% or better resistors for these resistor dividers
is recommended. The reference voltages of VOUT1
and VOUT3 are 0.6V, the reference voltage of VOUT2
is REFIN voltage. The VREF voltage is for REFIN in
independent mode. The following equations can be
used to calculate the output voltage:
0.6V
x
)
R2
R1
1
(
VOUT1
+
=
REFIN
x
)
R2
R1
1
VOUT2
+
= (
0.6V
x
)
R2
R1
1
VOUT3
+
= (
Mode)
nt
(Independe
x VREF
)
R4
R3
(1
REFIN
+
=
Mode)
(DDR
x VOUT1
)
R4
R3
(1
REFIN
+
=
Where:
R1 = resistor from VOUT to FB
R2 = resistor from FB to GND
R3 = resistor from VREF or VOUT1 to REFIN
R4 = resistor from REFIN to GND
Note that the R1 is part of the compensation. It should
be conformed to the feedback compensation.
External Clock
(LGATE)
LGATE1/2
UGATE1/2
300us
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相关代理商/技术参数 |
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|---|---|
| APW7066RC-TU | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066RC-TUL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7067N | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Synchronous Buck PWM and Linear Controller |
| APW7067N_08 | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Synchronous Buck PWM and Linear Controller |
| APW7067NKE-TR | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Synchronous Buck PWM and Linear Controller |
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