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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： | 5/18页 |
| 文件大小： | 399K |
| 代理商： | LM5010AHMH |
C3:
The capacitor at the VCC pin provides noise filtering and
stability, prevents false triggering of the V
CC UVLO at the buck
switch on/off transitions, and limits the peak voltage at V
CC
when a high voltage with a short rise time is initially applied
at V
IN. C3 should be no smaller than 0.47 F, and should be
a good quality, low ESR, ceramic capacitor, physically close
to the IC pins.
C4:
The recommended value for C4 is 0.022 F. A high quality
ceramic capacitor with low ESR is recommended as C4 sup-
plies the surge current to charge the buck switch gate at each
turn-on. A low ESR also ensures a complete recharge during
each off-time.
C5:
This capacitor suppresses transients and ringing due to
lead inductance at VIN. A low ESR, 0.1 F ceramic chip ca-
pacitor is recommended, located physically close to the
LM5010A.
C6:
The capacitor at the SS pin determines the soft-start time,
i.e. the time for the reference voltage at the regulation com-
parator, and the output voltage, to reach their final value. The
capacitor value is determined from the following:
For a 5 ms softstart time, C6 calculates to 0.022 F.
D1:
A Schottky diode is recommended. Ultra-fast recovery
diodes are not recommended as the high speed transitions at
the SW pin may inadvertently affect the IC’s operation through
external or internal EMI. The diode should be rated for the
maximum V
IN (60V), the maximum load current (1A), and the
peak current which occurs when current limit and maximum
ripple current are reached simultaneously (I
PK in Figure 4),
previously calculated to be 1.87A. The diode’s forward volt-
age drop affects efficiency due to the power dissipated during
the off-time. The average power dissipation in D1 is calculat-
ed from:
P
D1 = VF x IO x (1 - D)
where I
O is the load current, and D is the duty cycle.
FINAL CIRCUIT
The final circuit is shown in Figure 6, and its performance is
shown in Figures 7 & 8. Current limit measured approximately
1.3A.
20153833
FIGURE 6. Example Circuit
13
www.national.com
LM5010A
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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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