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參數(shù)資料
| 型號： | AS3843D1413 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Current Mode Controller |
| 中文描述： | 電流模式控制器 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大小： | 155K |
| 代理商： | AS3843D1413 |
2
ASTEC Semiconductor
AS384x
Current Mode Controller
Functional Block Diagram
Figure 1. Block Diagram of the AS3842/3/4/5
Pin Function Description
Pin Number Function
Description
1
COMP
This pin is the error amplifier output. Typically used to provide loop compensation to
maintain V
FB
at 2.5 V.
Inverting input of the error amplifier. The non-inverting input is a trimmed 2.5 V
bandgap reference.
2
V
FB
3
Current
Sense
A voltage proportional to inductor current is connected to the input. The PWM uses
this information to terminate the gate drive of the output.
4
R
T
/C
T
Oscillator frequency and maximum output duty cycle are set by connecting a resistor
(R
T
) to V
REG
and a capacitor (C
T
) to ground. Pulling this pin to ground or to V
REG
will
accomplish a synchronization function.
5
GND
Circuit common ground, power ground, and IC substrate.
6
Output
This output is designed to directly drive a power MOSFET switch. This output can sink
or source peak currents up to 1A. The output for the AS3844/5 switches at one-half
the oscillator frequency.
7
V
CC
V
REG
Positive supply voltage for the IC.
8
This 5 V regulated output provides charging current for the capacitor C
T
through the
resistor R
T
.
D
+
D
+
D
+
D
+
6
OUTPUT
2
ERROR AMP
1
4
5
7
8
GND
V
CC
V
REG
CURRENT
SENSE
R
T
/C
T
V
FB
COMP
S
R
FF
S
R
FF
(5.0 V)
(2.5 V)
(1.0 V)
2R
R
(5 V)
(3.0 V)
(1.3 V)
(0.6 V)
OSCILLATOR
PWM
COMPARATOR
OVER
TEMPERATURE
T
FF
CLK
÷
2 [3844/45]
CLK [3842/43]
5 V
REGULATOR
(5.0 V)
REF OK
(4 V)
UVLO
(6 V)
PWM LOGIC
3
+
D
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