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参数资料
| 型号： | NCV8843MNR2GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCV8843MNR2G |
| 设计资源： | NCV8843 EVB BOM NCV8843MNR2GEVB Gerber Files NCV8843 EVB Schematic |
| 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： | 3.3V |
| 电流 - 输出： | 1A |
| 输入电压： | 5 ~ 16 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 340kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCV8843 |
| 其它名称： | NCV8843MNR2GEVBOS |
NCV8843
30
25
20
15
10
5
0
0
0.5 1.0
1.5
SWITCHING CURRENT (A)
Figure 8. The Regulator in Current Limit
BOOST Pin
The BOOST pin provides base driving current for the
power switch. A voltage higher than V IN provides required
headroom to turn on the power switch. This in turn reduces
IC power dissipation and improves overall system
efficiency. The BOOST pin can be connected to an external
boost ? strapping circuit which typically uses a 0.1 m F capacitor
and a 1N914 or 1N4148 diode, as shown in Figure 1.
When the power switch is turned on, the voltage on the
BOOST pin is equal to
Figure 9. The Boost Pin Current Includes 7.0 mA
Pre ? Driver Current and Base Current when the
Switch is Turned On. The Beta Decline of the
Power Switch Further Increases the Base
Current at High Switching Current
Shutdown
The internal power switch will not turn on until the V IN
pin rises above the Startup Voltage. This ensures no
switching will occur until adequate supply voltage is
provided to the IC. Refer to Figure 10 for the SHDNB
(shutdown ? bar) pin input circuit.
VBOOST + VIN ) VO * VF
where:
V F = diode forward voltage.
The anode of the diode can be connected to any DC
voltage as well as the regulated output voltage (Figure 1).
However, the maximum voltage on the BOOST pin should
not exceed 40 V.
SHDNB
20k
± 33%
1.2V
-
+
V IN
As shown in Figure 9, the BOOST pin current includes a
constant 7.0 mA pre ? driver current and base current
proportional to switch conducting current. A detailed
V Z = 6V to 8V
GND
discussion of this current is conducted in Thermal
Consideration section. A 0.1 m F capacitor is usually
adequate for maintaining the Boost pin voltage during the on
time.
Figure 10.
The IC enters a sleep mode when the SHDNB pin is pulled
below the Shutdown Threshold Voltage. In sleep mode, the
power switch is kept open and the supply current reduces to
Shutdown Quiescent Current (1 m A typically). This pin has
an internal pull ? down current. When not in use, pull this pin
up to V CC with a resistor (See Figure 1). A 100 k W pullup
resistor will ensure safe operation from below 9 V and
during a 40 V load dump condition.
http://onsemi.com
8
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