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参数资料
| 型号： | UQQ-24/4-Q12P9L1-C |
| 厂商： | CD TECHNOLOGIES INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 96 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-9 |
| 文件页数： | 16/17页 |
| 文件大小： | 1988K |
| 代理商： | UQQ-24/4-Q12P9L1-C |
MDC_UQQ_A03 Page 8 of 7
UQQ Series
Wide Input Range Single Output DC/DC Converters
D C / D C C O N V E R T E R S
Technical enquiries email: sales@murata-ps.com, tel: + 508 339 3000
www.murata-ps.com
Start-Up Threshold and Undervoltage Shutdown
Under normal start-up conditions, the UQQ Series will not begin to regulate
properly until the ramping input voltage exceeds the Start-Up Threshold.
Once operating, devices will turn off when the applied voltage drops below
the Undervoltage Shutdown point. Devices will remain off as long as the
undervoltage condition continues. Units will automatically re-start when
the applied voltage is brought back above the Start-Up Threshold. The
hysteresis built into this function avoids an indeterminate on/off condition
at a single input voltage. See Performance/Functional Specifications table for
actual limits.
Start-Up Time
The VIN to VOUT Start-Up Time is the interval between the point at which
a ramping input voltage crosses the Start-Up Threshold voltage and the
point at which the fully loaded output voltage enters and remains within its
specified accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, and the slew rate and final value of
the input voltage as it appears to the converter. The On/Off to VOUT start-up
time assumes that the converter is turned off via the Remote On/Off Control
with the nominal input voltage already applied.
On/Off Control
The primary-side, Remote On/Off Control function (pin 2) can be specified
to operate with either positive or negative polarity. Positive-polarity devices
("P" suffix) are enabled when pin 2 is left open or is pulled high. Posi-
tive-polarity devices are disabled when pin 2 is pulled low (with respect to
–Input). Negative-polarity devices are off when pin 2 is high and on when
pin 2 is pulled low. See Figure 4
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate). The drive circuit should be able to sink appropriate
current (see Performance Specifications) when activated and withstand
appropriate voltage when deactivated.
Figure 4. Driving the Remote On/Off Control Pin
Sense is connected at the load and corrects for resistive errors only. Be
careful where it is connected. Any long, distributed wiring and/or significant
inductance introduced into the Sense control loop can adversely affect
overall system stability. If in doubt, test the application, and observe the
DC/DC’s output transient response during step loads. There should be no
appreciable ringing or oscillation. You may also adjust the output trim slightly
to compensate for voltage loss in any external filter elements. Do not exceed
maximum power ratings.
Current Limiting
When power demands from the output falls within the current limit incep-
tion range for the rated output current, the DC/DC converter will go into
a current limiting mode. In this condition the output voltage will decrease
proportionately with increases in output current, thereby maintaining a
somewhat constant power dissipation. This is commonly referred to as
power limiting. Current limit inception is defined as the point where the full-
power output voltage falls below the specified tolerance. If the load current
being drawn from the converter is significant enough, the unit will go into a
short circuit condition. See “Short Circuit Condition.”
Short Circuit Condition
When a converter is in current limit mode the output voltages will drop as
the output current demand increases. If the output voltage drops too low,
the magnetically coupled voltage used to develop primary side voltages will
also drop, thereby shutting down the PWM controller. Following a time-out
period of about 50 milliseconds, the PWM will restart, causing the output volt-
ages to begin ramping to their appropriate values. If the short-circuit condi-
tion persists, another shutdown cycle will be initiated. This on/off cycling
is referred to as “hiccup” mode. The hiccup cycling reduces the average
output current, thereby preventing internal temperatures from rising to
excessive levels. The UQQ is capable of enduring an indefinite short circuit
output condition.
Thermal Shutdown
UQQ converters are equipped with thermal-shutdown circuitry. If the inter-
nal temperature of the DC/DC converter rises above the designed operating
temperature (See Performance Specifications), a precision temperature
sensor will power down the unit. When the internal temperature decreases
below the threshold of the temperature sensor, the unit will self start.
Output Overvoltage Protection
The output voltage is monitored for an overvoltage condition via magnetic
coupling to the primary side. If the output voltage rises to a fault condition,
which could be damaging to the load circuitry (see Performance Specifica-
tions), the sensing circuitry will power down the PWM controller causing
the output voltage to decrease. Following a time-out period the PWM will
restart, causing the output voltage to ramp to its appropriate value. If the
fault condition persists, and the output voltages again climb to excessive
levels, the overvoltage circuitry will initiate another shutdown cycle. This
on/off cycling is referred to as “hiccup” mode.
Sense Input
Use the Sense input with caution. Many applications do not need the Sense
connection. Sense is intended to correct small output accuracy errors caused
by the resistive ohmic drop in output wiring as output current increases. This
output drop (the difference between Sense and VOUT when measured at the
converter) should not be allowed to exceed 0.5V. Consider using heavier wire if
this drop is excessive.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UQQ-3.3/25-Q12NB-C | 功能描述:DC/DC转换器 12Vin 3.3Vout 25A neg TH baseplate RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| UQQ-3.3/25-Q12N-C | 功能描述:DC/DC转换器 12Vin 3.3Vout 25A neg polarity TH RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| UQQ-3.3/25-Q12PB-C | 功能描述:DC/DC转换器 12Vin 3.3Vout 25A pos TH baseplate RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| UQQ-3.3/25-Q12PB-C | 制造商:Murata Power Solutions 功能描述:DC/DC Converter |
| UQQ-3.3/25-Q12P-C | 功能描述:DC/DC转换器 12Vin 3.3Vout 25A pos polarity TH RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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