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参数资料
| 型号： | LM5010AHMH |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | TSSOP-14 |
| 文件页数： | 6/18页 |
| 文件大小： | 399K |
| 代理商： | LM5010AHMH |
Item
Description
Value
C1
Ceramic Capacitor
(2) 2.2 F, 100V
C2
Ceramic Capacitor
22 F, 16V
C3
Ceramic Capacitor
0.47 F, 16V
C4, C6
Ceramic Capacitor
0.022 F, 16V
C5
Ceramic Capacitor
0.1 F, 100V
D1
Schottky Diode
100V, 6A
L1
Inductor
100 H
R1
Resistor
1.0 k
R2
Resistor
1.0 k
R3
Resistor
1.5
R
ON
Resistor
200 k
U1
National Semi LM5010A
20153835
FIGURE 7. Efficiency vs Load Current and V
IN
Circuit of Figure 6
20153837
FIGURE 8. Frequency vs V
IN
Circuit of Figure 6
MINIMUM LOAD CURRENT
The LM5010A requires a minimum load current of 500 A. If
the load current falls below that level, the bootstrap capacitor
(C4) may discharge during the long off-time, and the circuit
will either shutdown, or cycle on and off at a low frequency. If
the load current is expected to drop below 500 A in the ap-
plication, R1 and R2 should be chosen low enough in value
so they provide the minimum required current at nominal
V
OUT.
LOW OUTPUT RIPPLE CONFIGURATIONS
For applications where low output voltage ripple is required
the output can be taken directly from the low ESR output ca-
pacitor (C2) as shown in Figure 9. However, R3 slightly
degrades the load regulation. The specific component values,
and the application determine if this is suitable.
20153815
FIGURE 9. Low Ripple Output
Where the circuit of Figure 9 is not suitable, the circuits of
Figure 10 or Figure 11 can be used.
20153848
FIGURE 10. Low Output Ripple Using a Feedforward
Capacitor
In Figure 10, Cff is added across R1 to AC-couple the ripple
at V
OUT directly to the FB pin. This allows the ripple at VOUT
to be reduced, in some cases considerably, by reducing R3.
In the circuit of Figure 6, the ripple at V
OUT ranged from 50
mVp-p at V
IN = 6V to 320 mVp-p at VIN = 60V. By adding a
www.national.com
14
LM5010A
相关PDF资料 |
PDF描述 |
|---|---|
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM5010AHMHX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:High Voltage 1A Step Down Switching Regulator |
| LM5010AMH | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM5010AMH/NOPB | 功能描述:直流/直流开关转换器 Hi Volt 1A Step Down Switching Reg RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM5010AMHE | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 6V to 75V 14-Pin TSSOP EP T/R |
| LM5010AMHE/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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