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参数资料
| 型号： | IRDC3871 |
| 厂商： | International Rectifier |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IRDC3871 |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.05V |
| 电流 - 输出： | 8A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3871 |
IR3871MPBF
CIRCUIT DESCRIPTION
UNDER/OVER VOLTAGE MONITOR
The IR3871 monitors the voltage at the FB node
through a 350ns filter. If the FB voltage is below
OVER CURRENT MONITOR
The over-current circuitry monitors the output
current during each switching cycle. The voltage
the under voltage threshold, UV# is set to LOW
across
the
lower
MOSFET,
VPHASE,
is
holding PGOOD to be LOW. If the FB voltage is
above the over voltage threshold, OV# is set to
LOW, the shutdown signal (SD) is set to HIGH,
MOSFET gates are turned off, and PGOOD
signal is pulled low. Toggling VCC or EN will
allow the next start up. Figure 19 shows
monitored for over current and zero crossing. The
OCP circuit evaluates VPHASE for an over
current condition typically 270ns after the lower
MOSFET is gated on. This delay functions to filter
out switching noise. The minimum lower gate
interval allows time to sample VPHASE.
PGOOD
status
change
when
UV/OV
is
detected. The over voltage and under voltage
thresholds can be found in the Electrical
Specification section.
The over current trip point is programmed with a
resistor from the ISET pin to PHASE pin, as
shown in equation 4, where Tj is the junction
temperature of Q2 at operation conditions, and 0.4
is the temperature coefficient (~4000 ppm/ ? C) of
Q2 R DSON . When over current is detected, the
output gates are tri-state and SS voltage is pulled
to 0V. This initiates a new soft start cycle. If there
is a total of four OC events, the IR3871 will
disable switching, as shown in Figure 20. Toggling
VCC or EN will allow the next start up.
R SET ?
R DSON ? I OC
20 ? A
? (1 ?
T j ? 25
100
? 0.4)
(4)
Figure 19(a). Under/Over Voltage Monitor
* typical filter delay
Figure 20. Over Current Protection
Figure 19(b). Over Voltage Protection
12
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