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參數(shù)資料
| 型號(hào)： | CS5124XDR8 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 168K |
| 代理商： | CS5124XDR8 |
CS5124
http://onsemi.com
7
the SoftStart error amp is clamped at 2.9 V. During fault
conditions the SoftStart capacitor is discharged at 10 mA.
Fault Conditions
The CS5124 recognizes the following faults: UVLO off,
Thermal Shutdown, VREF(OK), and Second Current
Threshold. Once a fault is recognized, fault latch F2 is set
and the IC immediately shuts down the output driver and
discharges the SoftStart capacitor. SoftStart will begin
only after all faults have been removed and the SoftStart
capacitor has been discharged to less than 0.275 V. Each
fault will be explained in the following sections.
Under Voltage Lockout (UVLO)
The UVLO pin is tied to typically the midpoint of a
resistive divider between VIN and GROUND. During a start
up sequence, this pin must be above 2.6 V in order for the IC
to begin normal operation. If the IC is running and this pin
is pulled below 1.8 V, F2 shuts down the output driver and
discharges the SoftStart capacitor in order to insure proper
startup. If the UVLO pin is pulled high again before the
SoftStart capacitor discharges, the IC will complete the
SoftStart discharge and, if no other faults are present, will
immediately restart the power supply. If the UVLO pin stays
low, then it will enter either the low current sleep mode or the
UVLO state depending on the level of the UVLO pin.
Thermal Shutdown
If the IC junction temperature exceeds approximately
150
°C the thermal shutdown circuit sets F2, which shuts
down the output driver and discharges the SoftStart
capacitor. If no other faults are present the IC will initiate
SoftStart when the IC junction temperature has been
reduced by 25
°C.
VREF(OK)
VREF(OK) is an internal monitor that insures the internal
regulator is running before any switching occurs. This
function does not trip the fault comparator like the other fault
functions. To insure that SoftStart will occur at low line
conditions the UVLO divider should be set up so that the
VCC UVLO comparator turns on before the LINE UVLO
comparator.
Second Threshold Comparator
Since the maximum dynamic range of the ISENSE signal
in normal operation is 195 mV, any voltage exceeding this
threshold on the ISENSE pin is considered a fault and the
PWM cycle is terminated. The 2nd ICOMP compares the
ISENSE signal with a 275 mV threshold. If the ISENSE
voltage exceeds the second threshold, F2 is set, the driver
turns off, and the SoftStart capacitor discharges. After the
SoftStart capacitor has discharged to less than 0.275 V
SoftStart will begin. If the fault condition has been
removed the supply will operate normally. If the fault
remains the supply will operate in hiccup mode until the
fault condition is removed.
VFB Comparator
The VFB comparator detects when the output voltage is
too high. When the regulated output voltage is too high, the
feedback loop will drive VFB low. If VFB is less than 0.49 V
the output of the VFB comparator will go high and shut the
output driver off.
Oscillator
The internally trimmed, 400 kHz provides the slope
compensation ramp as well as the pulse for enabling the
output driver.
PWM Comparator and Slope Compensation
The CS5124 provides a fixed internal slope compensation
ramp that is subtracted from the feedback signal. The PWM
comparator compares peak primary current to a portion of
the difference of the feedback voltage and slope
compensation ramp. The 170 mV/
ms slope compensation
ramp is subtracted from the voltage feedback signal
internally. The difference signal is then divided by ten before
the PWM comparator to provide high noise rejection with a
low voltage across the current sense network. The effective
ramp is 21 mV/
ms. A 60 mV nominal offset on the positive
input to the PWM comparator allows for operation with the
ISENSE pin at, or even slightly below GND.
A 4.3 k
W pullup resistor internally connected to a 5.0 V
nominal reference provides the bias current to for an
optocoupler connection to the VFB pin.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS5124XDR8G | 功能描述:電流型 PWM 控制器 Hi Performance Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| CS5126-KL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Cirrus Logic 功能描述: |
| CS5126-KLZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Cirrus Logic 功能描述: |
| CS5126-KP | 制造商:Rochester Electronics LLC 功能描述:2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, - Bulk |
| CS5126XDR8 | 功能描述:IC REG CTRLR FLYBK ISO PWM 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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