- 您现在的位置：买卖IC网 > PDF目录1811 > IRU3039CHTR (International Rectifier)IC REG CTRLR BUCK PWM VM 20-MLPQ PDF资料下载
参数资料
| 型号： | IRU3039CHTR |
| 厂商： | International Rectifier |
| 文件页数： | 7/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 400kHz |
| 占空比： | 88% |
| 电源电压： | 4.75 V ~ 20 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 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： | 20-MLPQ |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IRU3039CHTR IRU3039CHTRCT |
IRU3039(PbF)
From Figure 7, the average inductor current during the
? I PK-PK(LIM)
2
? I PK-PK(LIM) =
( (V 2 × -V f × L ) × × V V )
I SET = I O(LIM) -
---(5)
Feedback V REF
voltage 0.4V
Switching
frequency
High Side MOSFET
turn on time (t ON )
Average Inductor
Current
F S(NOM)
V OUT
F S(NOM) × V IN
<I L >=I OUT
I OUT
I OUT
D MAX /F S(NOM)
I OUT
current limit mode is:
I O(LIM) = I SET + ---(4)
The inductor's ripple current can be expressed as:
(V IN - V OUT ) × V OUT
V IN × L × f S
Combination of above equation and (4) results in:
IN OUT OUT
S IN
Combination of equations (5) and (2) results in the rela-
tionship between R SET and output current limit.
I OUT
[ (
Normal
operation
I O(LIM)
I O(MAX)
Over Current Shutdown
Limit Mode by UVLO
R SET =
R DS(ON)
I OCSET
× I O(LIM) -
(V IN -V OUT ) × V OUT
2 × f S × L × V IN
)] ---(6)
Figure 6 - Diagram of over-current operation.
Operation in current limit is shown in Figure 7, the high
side MOSFET is turned off and inductor current starts to
decrease. Because the output inductor current is higher
than the current limit setpoint (I SET ), the over-current com-
parator keeps high until the inductor current decreases
to be below I SET . Then another cycle starts.
During over-current mode, the valley inductor current is:
i L(VALLEY) = I SET
The peak inductor current is given as:
Where:
I O(LIM) = The Output Current Limit. Typical is 50%
higher than nominal output current
V IN = Maximum Input Voltage
V OUT = Output Voltage
f S = Switching Frequency
L = Output Inductor
R DS(ON) = R DS(ON) of Low Side MOSFET
I OCSET = OC Threshold Set Current
From the above analysis, the current limit is not only
dependent on the current setting resistor R SET and R DS(ON)
I L(PEAK) = I SET +(V IN -V OUT ) × t ON /L
---(3)
of low side MOSFET but it is also dependent on the
input voltage, output voltage, inductance and switching
To avoid undesirable trigger of over-current protection,
this relationship must be satisfied:
frequency as well.
I SET
I O(NOM) -
? I PK-PK(NOM)
2
The cycle-by-cycle over-current limit will hold for a cer-
tain amount of time, until the output voltage drops below
0.4V, the under-voltage lock out activates and latches
off the output driver. The operation waveform is shown in
Current
Inductor i L(PEAK)
i L(AVG)
I SET =i L(VALLEY)
Current Limit
Comparator Output
HDrv
t ON
t OFF
Figure 7. Normal operation will resume after IRU3039 is
powered up again.
Figure 7 - Operation waveforms during current limit.
www.irf.com
7
相关PDF资料 |
PDF描述 |
|---|---|
| IRU3046CFTR | IC REG CTRLR BUCK PWM VM 24TSSOP |
| IRU3047CWTR | IC REG CTRLR BUCK PWM VM 20-SOIC |
| IRU3048CFTR | IC REG CTRLR BUCK PWM VM 16TSSOP |
| IRU3055CQTR | IC CTRL SYNC 3-PHASE 36-QSOP |
| IRU3065CLTR | IC REG CTRLR INV PWM SOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU3046 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER |
| IRU3046CF | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER |
| IRU3046CFTR | 功能描述:IC REG CTRLR BUCK PWM VM 24TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:75 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.3 V ~ 13.5 V 降压:是 升压:是 回扫:是 反相:无 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:8-SOIC（0.154"，3.90mm 宽） 包装:管件 产品目录页面:1051 (CN2011-ZH PDF) 其它名称:296-2543-5 |
| IRU3046CFTRPBF | 制造商:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER |
| IRU3047 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER |
发布紧急采购，3分钟左右您将得到回复。