- 您现在的位置：买卖IC网 > PDF目录19920 > NCV8674DS50G (ON Semiconductor)IC REG LDO 5V .35A D2PAK-3 PDF资料下载
参数资料
| 型号： | NCV8674DS50G |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .35A D2PAK-3 |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.3V @ 350mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 350mA |
| 电流 - 限制（最小）： | 350mA |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-3，D²Pak（2 引线+接片），TO-263AB |
| 供应商设备封装： | D2PAK |
| 包装： | 管件 |
NCV8674
IOUT(max) ) VIN(max) @ Iq
R q JA +
150 o C * TA
PD
Circuit Description
The NCV8674 is a precision trimmed 5.0 V or 12 V fixed
output regulator. Careful management of light load
consumption combined with a low leakage process results
in a typical quiescent current of 30 m A. The device has
current capability of 350 mA, with 600 mV of dropout
voltage at full rated load current. The regulation is provided
by a PNP pass transistor controlled by an error amplifier
with a bandgap reference. The regulator is protected by
both current limit and short circuit protection. Thermal
shutdown occurs above 150 ° C to protect the IC during
overloads and extreme ambient temperatures.
Regulator
The error amplifier compares the reference voltage to a
sample of the output voltage (V out ) and drives the base of
a PNP series pass transistor by a buffer. The reference is a
bandgap design to give it a temperature ? stable output.
Saturation control of the PNP is a function of the load
current and input voltage. Over saturation of the output
power device is prevented, and quiescent current in the
ground pin is minimized. The NCV8674 is equipped with
foldback current protection. This protection is designed to
reduce the current limit during an overcurrent situation.
Regulator Stability Considerations
The input capacitor C IN in Figure 2 is necessary for
compensating input line reactance. Possible oscillations
caused by input inductance and input capacitance can be
damped by using a resistor of approximately 1 W in series
with C IN . The output or compensation capacitor, C OUT
helps determine three main characteristics of a linear
regulator: startup delay, load transient response and loop
stability. The capacitor value and type should be based on
cost, availability, size and temperature constraints.
Tantalum, aluminum electrolytic, film, or ceramic
capacitors are all acceptable solutions, however, attention
75
50
D 2 PAK 1 oz
must be paid to ESR constraints. The aluminum
electrolytic capacitor is the least expensive solution, but, if
the circuit operates at low temperatures ( ? 25 ° C to ? 40 ° C),
both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturer ’s data sheet
usually provides this information. The value for the output
capacitor C OUT shown in Figure 2 should work for most
applications; however, it is not necessarily the optimized
solution. Stability is guaranteed at values C OUT ≥ 22 m F and
ESR ≤ 7.0 W , within the operating temperature range.
Actual limits are shown in a graph in the Typical
Characteristics section.
Calculating Power Dissipation in a Single Output
Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 2) is:
PD(max) + [VIN(max) * VOUT(min)] @
(eq. 1)
Where:
V IN(max) is the maximum input voltage,
V OUT(min) is the minimum output voltage,
I OUT(max) is the maximum output current for the
application, and I q is the quiescent current the regulator
consumes at I OUT(max) .
Once the value of P D(Max) is known, the maximum
permissible value of R q JA can be calculated:
(eq. 2)
The value of R q JA can then be compared with those in
thermal resistance versus copper area graph (Figure 26).
Those designs with cooling area corresponding to R q JA ’s
less than the calculated value in Equation 2 will keep the
die temperature below 150 ° C. The current flow and
voltages are shown in the Measurement Circuit Diagram.
100
10
25
D 2 PAK 2 oz
1
D 2 PAK
0
0
100
200
300
400
500
600
700
800
900
0.1
0.000001
0.0001
0.01
0.1
1
Single Pulse
10 100 1000
COPPER AREA (mm 2 )
Figure 26.
http://onsemi.com
9
PULSE TIME (sec)
Figure 27. NCV8674 @ PCB Cu Area 650 mm 2
PCB Cu thk 1 oz
相关PDF资料 |
PDF描述 |
|---|---|
| DS1216C | IC SMART/RAM 5V 64K/256K 28-DIP |
| R2D12-0509/HP-R | CONV DC/DC 2W +/-9VOUT SMD |
| DS1314E/T&R | IC CTRL NV W/BATT MON 3V 20TSSOP |
| R2D12-2409/P-R | CONV DC/DC 2W +/-9VOUT SMD |
| CDBMT1100-HF | DIODE SCHOTTKY 100V 1A SOD-123H |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8674DS50R4G | 功能描述:低压差稳压器 - LDO 350mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8675 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:350 mA Very Low Iq Low Dropout Linear Regulator with Reset and Reset Delay |
| NCV8675DS33G | 功能描述:低压差稳压器 - LDO 350mA LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8675DS33R4G | 功能描述:低压差稳压器 - LDO 350mA LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV8675DS50G | 功能描述:低压差稳压器 - LDO NCV8675 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
发布紧急采购，3分钟左右您将得到回复。