參數(shù)資料
型號(hào)： AS2845
英文描述： Current Mode Controller
中文描述： 電流模式控制器
文件頁(yè)數(shù)： 2/20頁(yè)
文件大?。?/td> 94K
代理商： AS2845
AS2842/3/4/5
Current Mode Controller
ASTEC Semiconductor
38
Functional Block Diagram
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.
2
V
FB
Inverting input of the error amplifier. The non-inverting input is a trimmed 2.5 V
bandgap reference.
3
I
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
OUT
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 AS2844/5 switches at one-half the
oscillator frequency.
7
V
CC
Positive supply voltage for the IC.
8
V
REG
This 5 V regulated output provides charging current for the capacitor C
T
through the
resistor R
T
.
Figure 1.
Block Diagram of the AS2842/3/4/5
–
+
–
+
–
+
–
+
6
OUT
2
ERROR AMP
1
4
5
7
8
GND
V
CC
V
REG
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
(4 V)
PWM LOGIC
3
+
–
I
SENSE
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