參數(shù)資料
型號： MC33680
廠商： ON SEMICONDUCTOR
英文描述： 0.4W, 75V, 0.3A, SIGNAL DIODE, SOD123
中文描述： 雙的DC - DC穩(wěn)壓器的電子記事
文件頁數(shù)： 10/16頁
文件大小： 340K
代理商： MC33680
MC33680
http://onsemi.com
10
DETAILED OPERATING DESCRIPTION (Cont’d)
Figure 18. Simplified Block Diagram of Main Regulator
+ve Edge Delay
R
S
Q
R
S
Q
Qb
1–SHOT
VBAT
Voltage
Reference
Main Regulator
with Synchronous Rectifier
Voltage Reference
& Current Bias
AGND
1.22 V
0.5 V
x2
RIref
480 kOhm
VMAINFB
CMAINb
100 pF
VCOMP
for Mn. OFF Time
AGND
ILIM
DGND
VDD
RMAINb
1000 kOhm
L1
33uH
CMAIN
100 uF
VMAINSW
VMAINGND
DGND
VDD
M1
M2
senseFET
Iref
2 x Iref
ZLC
for Max. ON Time
COMP2
COMP3
COMP1
VMAIN
+
30
32
31
1
8
IREF
In Figure 20, regulator is operating at Discontinuous
Conduction Mode, waveforms are similar to those of Figure
19. However, coil current drops to zero before next
switching cycle starts.
To estimate conduction mode, below equation can be
used.
Iroom
T
ON
L
Vin2
Vout
2
ILOAD
where,
η
is efficiency, refer to Figure 4
if
Iroom
> 0, the regulator is at Discontinuous Conduction
mode
if
Iroom
= 0, the regulator is at Critical Conduction mode
where coil current just drops to zero and next cycle starts.
if
Iroom
< 0, the regulator is at Continuous Conduction
mode
For Continuous Conduction mode, provided that current
limit is not reached,
TSW
TON
1
Vin
Vout
(S);
Ipk
ILOAD
TON
TSW
1
Vin
TON
L
2
(A)
For Discontinuous Conduction mode, provided that
current limit is not reached,
T2
ON
Vout
TSW
Vin
2
L
ILOAD
Vin
1
(S);
Ipk
Vin
L
TON
(A)
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參數(shù)描述
MC33680FTBR2 功能描述:IC REG BST SYNC ADJ 0.2A 32LQFP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR
MC33689DDWB 功能描述:CAN 接口集成電路 SBCLIN RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube
MC33689DDWBR2 功能描述:CAN 接口集成電路 SBCLIN RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube
MC33689DPEW 制造商:Freescale Semiconductor 功能描述:SYSTEM BASIS CHIP W/LIN 制造商:Freescale Semiconductor 功能描述:SYSTEM BASIS CHIP W/LIN - Bulk 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/LIN 32SOIC
MC33689DPEWR2 制造商:Freescale Semiconductor 功能描述:SYSTEM BASIS CHIP W/LIN 制造商:Freescale Semiconductor 功能描述:SYSTEM BASIS CHIP W/LIN - Tape and Reel 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/LIN 32SOIC
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