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| 型号： | ADM00427 |
| 厂商： | Microchip Technology |
| 文件页数： | 15/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION MCP16323 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3V |
| 电流 - 输出： | 3A |
| 输入电压： | 6 ~ 18 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP16323 |
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MCP16323
4.0
DETAILED DESCRIPTION
4.1.4
ENABLE INPUT
The enable input (EN) is used to disable the device. If
4.1
Device Overview
disabled, the device consumes a minimal current from
The MCP16323 is a high input voltage step-down
regulator, capable of supplying 3A to a regulated output
voltage from 0.9V to 5V. Internally, the 1 MHz oscillator
provides a fixed frequency, while the Peak Current
Mode Control architecture varies the duty cycle for
output voltage regulation. An internal floating driver is
used to turn the high-side integrated N-Channel
MOSFET on and off. The power for this driver is
derived from an external boost capacitor whose energy
is replenished when the low-side N-Channel MOSFET
the input. Once enabled, the internal soft start controls
the output voltage rate of rise, preventing high-inrush
current and output voltage overshoot. The EN is
internally pulled up or enabled, to disable the converter,
it must be pulled low.
4.1.5 SOFT START
The internal reference voltage rate of rise is controlled
during startup, minimizing the output voltage overshoot
and the inrush current.
is turned on. When the maximum duty cycle
approaches 100%, the boost capacitor is replenished
for 240 ns after every 8 cycles.
4.1.6
OUTPUT OVERVOLTAGE
PROTECTION
4.1.1 INTERNAL REFERENCE VOLTAGE
V REF
For the adjustable version, an integrated precise 0.9V
If the output of the regulator exceeds 103% of the
regulation voltage, the SW outputs will tri-state to
protect the device from damage. This check occurs at
the start of each switching cycle.
reference combined with an external resistor divider
sets the desired converter output voltage. The resistor
4.1.7
INPUT UNDER VOLTAGE LOCKOUT
divider can vary without affecting the control system
gain. High-value resistors consume less current, but
are more susceptible to noise. For the fixed version, an
integrated precise voltage reference is set to the
desired V OUT value and is directly connected to V OUT .
4.1.2 INTERNAL COMPENSATION
An integrated Under Voltage Lockout (UVLO) prevents
the converter from starting until the input voltage is high
enough for normal operation. The converter will
typically start at 5.75V (typical) and operate down to
5.25V (typical). Hysteresis of 500 mV (typical) is added
to prevent starting and stopping during startup, as a
result of loading the input voltage source.
All control system components necessary for stable
operation over the entire device operating range are
4.1.8
MINIMUM DUTY CYCLE
integrated, including the error amplifier and inductor
current slope compensation.
4.1.3 EXTERNAL COMPONENTS
External components consist of:
? Input capacitor
? Output filter (inductor and capacitor)
? Boost capacitor
? Resistor divider (adjustable version only)
The selection of the external inductor, output capacitor,
input capacitor and boost capacitor is dependent upon
the output voltage and the maximum output current.
? 2011 Microchip Technology Inc.
A minimum duty cycle of 70 ns typical prevents the
device from constant switching for high step-down
voltage ratios. Duty cycles less than this minimum will
initiate pulse skipping to maintain output voltage
regulation, resulting in higher output voltage ripple.
Duty cycle for continuous inductor current operation is
approximated by V OUT /V IN . For a 1 MHz switching
frequency or 1 μs period, this results in a 7% duty cycle
minimum. Maximum V IN for continuous switching can
be approximated dividing V OUT by the minimum duty
cycle or 7%. For example, the maximum input voltage
for continuous switching for a 1.5V output is equal to
approximately 21V.
DS22284A-page 15
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