參數(shù)資料
型號(hào)： L6566BH
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁數(shù)： 16/48頁
文件大小： 768K
代理商： L6566BH
L6566BH
Application information
Doc ID 16610 Rev 1
23/48
Figure 12.
Addition of an offset to the current sense lowers the burst-mode
operation threshold
5.4
Adaptive UVLO
A major problem when optimizing a converter for minimum no-load consumption is that the
voltage generated by the auxiliary winding under these conditions falls considerably as
compared even to a few mA load. This very often causes the supply voltage Vcc of the
control IC to drop and go below the UVLO threshold so that the operation becomes
intermittent, which is undesired. Furthermore, this must be traded off against the need of
generating a voltage not exceeding the maximum allowed by the control IC at full load.
To help the designer overcome this problem, the device, besides reducing its own
consumption during burst-mode operation, also features a proprietary adaptive UVLO
function. It consists of shifting the UVLO threshold downwards at light load, namely when
the voltage at pin COMP falls below a threshold VCOMPO internally fixed, so as to have more
headroom. To prevent any malfunction during transients from minimum to maximum load
the normal (higher) UVLO threshold is re-established when the voltage at pin COMP
exceeds VCOMPL and Vcc has exceeded the normal UVLO threshold (see Figure 13). The
normal UVLO threshold ensures that at full load the MOSFET will be driven with a proper
gate-to-source voltage.
Rs
L6566BH
R
Vref
Rc
10
4
7
3
Vcso = Vref
R
R + Rc
Figure 13.
Adaptive UVLO block
VCOMPL
VCOMPO
VCOMP
(pin 9)
Vcc
(pin 5)
Q
VccOFF1
VccOFF2
t
(*) VccOFF2< VccOFF1is selected when Q is high
+
-
UVLO
VccOFF1
Vcc
L6566BH
COMP
R
S
Q
+
-
+
-
VccOFF2
(*)
SW
5
9
V COMPL
V COMPO
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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: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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