參數(shù)資料
型號(hào)： L6566B
廠商： 意法半導(dǎo)體
英文描述： Multi-mode controller for SMPS
中文描述： 多模式開(kāi)關(guān)電源控制器
文件頁(yè)數(shù)： 36/51頁(yè)
文件大?。?/td> 401K
代理商： L6566B
Application information
L6566B
36/51
Figure 23. OVP function: timing diagram
The value of R
Z1
will be such that the current sourced by the ZCD pin be within the rated
capability of the internal clamp:
Equation 14
where Vin
max
is the maximum dc input voltage and Ns the turn number of the primary
winding. See
Section 5.2: Zero current detection and triggering block; oscillator block on
page 21
for additional details.
To reduce sensitivity to noise and prevent the latch from being erroneously activated, first
the OVP comparator is active only for a small time window (typically, 0.5 μs) starting 2 μs
after MOSFET’s turn-off, to reject the voltage spike associated to the positive-going edges
of the voltage across the auxiliary winding Vaux; second, to stop the L6566B the OVP
comparator must be triggered for four consecutive switching cycles. A counter, which is
reset every time the OVP comparator is not triggered in one switching cycle, is provided to
this purpose.
Figure 22 on page 35
shows the internal block diagram, while the timing diagrams in
Figure 23
illustrate the operation.
Note:
To use the OVP function effectively, i.e. to ensure that the OVP comparator will be always
interrogated during MOSFET’s OFF-time, the duty cycle D under open-loop conditions must
fulfill the following inequality:
t
GD
(pin 4)
Vaux
5V
t
t
t
STROBE
t
COUNTER
RESET
t
COUNTER
STATUS
t
0
ZCD
(pin 11)
2 μs
0.5 μs
OVP
FAULT
0
0
0
0
→
1
1
→
2
2
→
0
0
→
1
1
→
2
2
→
3
3
→
4
0
NORMAL OPERATION
TEMPORARY DISTURBANCE
FEEDBACK LOOP FAILURE
t
COUT
t
max
3
1
Z
Vin
Np
Naux
10
3
1
R
≥
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參數(shù)描述
L6566B_08 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS
L6566BH 功能描述:電流型 PWM 控制器 Multimode Controller SMPS 800V <3mA 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
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
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