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参数资料
| 型号： | IR3094MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 48MLPQ |
| 标准包装： | 200 |
| PWM 型： | 电压模式 |
| 输出数： | 3 |
| 频率 - 最大： | 540kHz |
| 占空比： | 100% |
| 电源电压： | 8 V ~ 16 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 ~ 150°C |
| 封装/外壳： | 48-MLPQ |
| 包装： | 剪切带 (CT) |
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IR3094PBF
1.
2.
3.
4.
VCC Under Voltage Lock Out
5VUVL Under Voltage Lock Out
Low Enable pin
Over Current condition.
A delay is included if any of the four fault conditions occurs after a successful soft start sequence. This is required
since momentary faults can occur as part of normal operation due to load transients such as exciting an over-
current condition. If any fault occurs during normal operation, the SS/DEL capacitor will discharge through a 55uA
current sink but will not set the fault latch immediately. If the fault condition persists long enough for the SS/DEL
capacitor to discharge below the 3.75V threshold of the delay comparator, the Fault latch will be set pulling the Error
Amplifier’s output low, inhibiting switching and de-asserting the PWRGD signal. The SS/DEL capacitor is then
discharged through a 6uA discharge current resulting in a long hiccup duration.
The SS/DEL capacitor will continue to discharge until it reaches 0.265V where the fault latch is reset allowing a
normal soft start to occur. If a fault condition is again encountered during the soft start cycle, the fault latch will be
set without any delay and hiccup mode will begin. During hiccup mode the 10 to 1 charge to discharge ratio results
in a 9.1% hiccup mode duty cycle regardless of at what point a fault condition occurs.
OVP fault immediately sets the fault latch causing SS/DEL to begin to discharge and this fault can only be cleared
by cycling power to the IR3094 on and off.
If SS/DEL pin is pulled below 0.8V, the converter can be disabled.
VCC
(12V)
5VUVL
4.36V
3.75V
7.0V
UVLO
SS/DEL
1.1V
VOUT
PWRGD
OCP THRESHOLD
IOUT
START-UP
(5VUVL GATES
FAULT MODE)
NORMAL OPERATION
(VOUT CHANGES DUE TO
LOAD AND VID CHANGES)
OCP
DELAY
HICCUP OVER-CURRENT
PROTECTION
RE-START
AFTER OCP
CLEARS
POWER-DOWN
(VCC GATES
FAULT MODE)
Figure 7 – Operating Waveforms
Soft-start delay time t SSDEL is the time SS/DEL charged up to 1.1V. After that the error amplifier output is released
to allow the soft start. The soft start time t SS represents the time during which converter output voltage rises from
zero to V O. t SS can be programmed by C SS using equation (3).
Page 16 of 29
C SS
I CHG * t SS
V O
60 * 10 6 * t SS
V O
(3)
09/26/05
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| IR3094MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VRD10 CTRL IC CTRL IC 200 to 700mV RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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| IR3101-EL | 制造商:International Rectifier 功能描述: |
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