參數(shù)資料
型號(hào)： MCP1630
廠商： Microchip Technology Inc.
英文描述： High-Speed, Microcontroller-Adaptable, Pulse Width Modulator
中文描述： 高速微控制器適應(yīng)性，脈寬調(diào)制器
文件頁(yè)數(shù)： 9/18頁(yè)
文件大?。?/td> 273K
代理商： MCP1630
2004 Microchip Technology Inc.
DS21896A-page 9
MCP1630
3.0
MCP1630 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
COMP Pin
COMP is an internal error amplifier output pin. External
compensation is connected from the FB pin to the
COMP pin for control-loop stabilization. An internal
voltage clamp is used to limit the maximum COMP pin
voltage to 2.7V typical. This clamp is used to set the
maximum peak current in the power system switch by
setting a maximum limit on the CS input for peak
current mode control systems.
3.2
FB Pin
FB is an internal error amplifier inverting input pin. The
output (voltage or current) is sensed and fed back to
the FB pin for regulation. Inverting or negative feed
back is used.
3.3
CS Input
CS is the current sense input pin used for cycle-by-
cycle control for peak current mode converters. A ramp
can be placed on this input for voltage or average
current mode converters.
3.4
OSC Input
OSC is an external oscillator input pin. Typically, a
microcontroller I/O pin is used to generate the OSC
input. When high, the output driver (V
EXT
) pin is driven
low. The high-to-low transition initiates the start of a
new cycle. The duty cycle of the OSC input pin deter-
mines the maximum duty cycle of the power converter.
For example, if the OSC input is low for 75% of the time
and high for 25% of the time, the duty cycle range for
the power converter is 0% to 75% maximum.
3.5
GND
Connect circuit ground to the GND pin. For most appli-
cations, this should be connected to the analog or quiet
ground plane. Noise on this ground can affect the
sensitive cycle-by-cycle comparison between the CS
input and the error amplifier output.
3.6
V
EXT
Pin
V
EXT
is an external driver output pin. This output pin is
used to determine the power system duty cycle. For
high-power or high-side drives, this output should be
connected to the logic-level input of the MOSFET driver.
For low-power, low-side applications, the V
EXT
pin can
be used to directly drive the gate of an N-channel
MOSFET.
3.7
V
IN
Pin
V
IN
is an input voltage pin. Connect the input voltage
source to the V
IN
pin. For normal operation, the voltage
on the V
IN
pin should be between +3.0V and +5.5V. A
0.1 μF bypass capacitor should be connected between
the V
IN
pin and the GND pin.
3.8
V
REF
Input
V
REF
is an external reference input pin used to regulate
the output of the power system. By changing the V
REF
input, the output (voltage or current) of the power sys-
tem can be changed. The reference voltage can range
from 0V to V
IN
(rail to rail).
Pin No.
Name
Function
1
2
3
4
5
6
7
8
COMP
FB
CS
OSC IN
GND
V
EXT
V
IN
V
REF
Error Amplifier Output Pin
Error Amplifier Inverting Input
Current Sense Input pin
Oscillator Input pin
Circuit Ground Pin
External driver output pin
Input bias pin
Reference Voltage Input Pin
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