參數(shù)資料
型號(hào)： L6566BH
廠(chǎng)商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁(yè)數(shù)： 29/48頁(yè)
文件大小： 768K
代理商： L6566BH
L6566BH
Application information
Doc ID 16610 Rev 1
35/48
Equation 15
where TBLANK2 = 2 s; this is also illustrated in the diagram of Figure 24.
5.12
Brownout protection
Brownout protection is basically a not-latched device shutdown function activated when a
condition of mains undervoltage is detected. There are several reasons why it may be
desirable to shut down a converter during a brownout condition, which occurs when the
mains voltage falls below the minimum specification of normal operation.
Firstly, a brownout condition may cause overheating of the primary power section due to an
excess of RMS current. Secondly, spurious restarts may occur during converter power
down, hence causing the output voltage not to decay to zero monotonically.
L6566BH shutdown upon brownout is accomplished by means of an internal comparator, as
shown in the block diagram of Figure 25 on page 36, which shows the basic usage. The
inverting input of the comparator, available on the AC_OK pin (16), is supposed to sense a
voltage proportional to the RMS (peak) mains voltage; the non-inverting input is internally
referenced to 0.485 V with 35 mV hysteresis. If the voltage applied on the AC_OK pin before
the device starts operating does not exceed 0.485 V or if it falls below 0.45 V while the
device is running, the AC_FAIL signal goes high and the device shuts down, with the soft-
start capacitor discharged and the gate-drive output low. Additionally, if the device has been
latched off by some protection function (testified by Vcc oscillating between VccON and
VccON - 0.5 V) the AC_OK voltage falling below 0.45 V clears the latch. This may allow a
quicker restart as the input source is removed.
While the brownout protection is active the start-up generator keeps on working but, being
there no PWM activity, the Vcc voltage continuously oscillates between the start-up and the
HV generator restart thresholds, as shown in the timing diagram of Figure 25.
Figure 24.
Maximum allowed duty cycle vs switching frequency for correct OVP
detection
1
f
T
D
sw
2
BLANK
≤
+
5 .10
4
1 .10
5
1.5.10
5
2 .10
5
2.5.10
5
3 .10
5
3.5.10
5
4 .10
5
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.725
fsw [Hz]
Dmax
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6566BHTR 功能描述:電流型 PWM 控制器 MULTIMODE CONTROLLER SMPS 8V 3 mA RoHS:否 制造商:Texas Instruments 開(kāi)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
L6566BTR 功能描述:電流型 PWM 控制器 MultiMode Controller for SMPS RoHS:否 制造商:Texas Instruments 開(kāi)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
L6566BTR-CUT TAPE 制造商:ST 功能描述:L6566B Series 23 V 4.6 mA SMPS Multi-Mode Controller Surface Mount - SOIC-16N
L6567 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:HIGH VOLTAGE DRIVER FOR CFL
L6567D 制造商:STMicroelectronics 功能描述:CFL DRVR 18V 14SOP - Rail/Tube
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