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参数资料
| 型号： | IRU3065CLTR |
| 厂商： | International Rectifier |
| 文件页数： | 6/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM SOT23-6 |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 100% |
| 电源电压： | 5V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | SOT-23-6 |
| 包装： | 剪切带 (CT) |
| 配用： | IRDC3065-ND - LOW PWR SWTCH REG REF DESIGN KIT |
| 其它名称： | *IRU3065CLTR IRU3065CLCT |
IRU3065(PbF)
in figure 1. The schottky diode can be replaced with a
100 ? resistor (Figure 28.) with a small sacrifice of effi-
Demo board Evaluation Results
ciency but lower cost.
Fig.1 shows the evaluation board schematic and the
T hermal Consideration
The thermal design is to ensure maximum junction tem-
perature of IRU3065 will not exceed the maximum op-
eration junction temperature, which is 125 C. The junc-
selected components. The diode D1 can be replaced
with a 100ohm resistor. The measured efficiency ver-
sus load current is shown in Fig. 6. With the boot strap
schottky diode, the efficiency is slight higher compar-
ing with using 100ohm resistor.
tion temperature can be estimated by the following:
If higher efficiency is preferred, lower operation fre-
T J = P D ×Θ JA +T A ≤ T J(MAX) = 125 C
Where Θ JA is the thermal resistance from junction to
case which is usually provided in the specification. P D
is the power dissipation. T A is the ambient temperature.
The package thermal resistance of IRU3065 is estimated
as 230C/W due to compact package.
Assuming the maximum allowed ambient temperature
is 70C, the maximum power dissipation of IRU3065 will
be
quency should be selected. Figure. 5 shows a effi-
ciency curve when 4.7uH inductor is chosen. The maxi-
mum operation frequency reduces from 800k to 250kHz.
As a results, efficiency is more than 10% higher.
For the application circuit shown in Fig.1. The mea-
sured output voltage versus output current is shown in
Figure 7. When the load current approaches 400mA,
the output voltage starts to drop and goes into power
limit mode. When output is about 1A, the output voltage
will goes almost zero.
P D <(125-70C)/ Θ JA =(125-70)/230=240mW
The measured frequency versus load is listed in Fig-
For High Power Application
The IR3065 driver is designed to driver PMOS for low
current applications. Figure 4. shows the rise time ver-
sus cap load. For big capacitor load, the rise time is
ure 8. The highest switching frequency occurs at about
440mA. As load current goes up, the IC goes into
power limit mode and frequency automatically goes down
to protect the system.
increasing.
The current sensing comparator threshold voltage ver-
sus VCC is shown in Figure. 9. Since this threshold is
90
80
70
60
50
40
30
20
10
0
Rise time versus cap load
only a divided voltage of VCC, it will changes when
VCC changes. This should be aware in the application.
The output voltage versus Vin=VCC is shown in fig-
ure 11. Since the voltage reference is set by Vin. When
Vin changes, the output voltage will change along Vin.
Sometimes this feature is preferrable since Vout may
want to be tracked with Vin except the polarity. How-
ever, if more accurate output is required, a external
voltage reference should set the output voltage.
For the evaluation board, the measured inductor volt-
0
0.5
1
1.5
2
2.5
age waveforms are listed in Figure 13-17. Figure 15
Cap(nF)
Fig.4. Rise time versus cap load.
The internal gate driver of IRU3065 is designed for
load current up to 1A. For higher power applications,
external driver is recommended to driver the external
FETs.
shows the measured inductor voltage waveform when
output current is 250mA, which the converter is oper-
ated in regulation mode and output voltage is regulated
at desired voltage -5V. Figure 16 shows the measured
inductor voltage waveform when the output current is
equal to the critical current I OCP . Figure 17 shows the
measured inductor voltage waveform when the output is
in short circuit, which indicates that the converter is in
power limit mode and output voltage is near zero.
6
.
www.irf.com
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相关代理商/技术参数 |
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|---|---|
| IRU3065CLTRPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:POSITIVE TO NEGATIVE DC TO DC CONTROLLER |
| IRU3072C | 制造商:IRF 制造商全称:International Rectifier 功能描述:20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER |
| IRU3072CH | 制造商:IRF 制造商全称:International Rectifier 功能描述:20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER |
| IRU3072CHTR | 制造商:International Rectifier 功能描述:VOLT MODE PWM CNTRLR 0.8V TO 24.75V/1.5V/1.8V/2.5V 1A 20MLPQ - Tape and Reel |
| IRU3073 | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER |
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