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參數(shù)資料
| 型號： | ISL8840A |
| 廠商： | Intersil Corporation |
| 英文描述： | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| 中文描述： | 高性能的行業(yè)標(biāo)準(zhǔn)單端電流模式PWM控制器 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 313K |
| 代理商： | ISL8840A |
13
FN6320.3
April 18, 2007
Example:
V
IN
= 12V
V
O
= 48V
L
s
= 800
μ
H
Ns/Np = 10
Lp = 8.0
μ
H
I
O
= 200mA
Switching Frequency, f
sw
= 200kHz
Duty Cycle, D = 28.6%
R
6
= 499
Ω
Solve for the current sense resistor, R
CS
, using Equation 15.
R
CS
= 295m
Ω
Determine the amount of voltage, Ve, that must be added to
the current feedback signal using Equation 12.
Ve = 92.4mV
Using Equation 17, solve for the summing resistor, R
9
, from
CT to CS.
R
9
= 2.67k
Ω
Determine the new value of R
CS
(R’
CS
) using Equation 18.
R’
CS
= 350m
Ω
Additional slope compensation may be considered for
design margin. The above discussion determines the
minimum external ramp that is required. The buffer transistor
used to create the external ramp from RTCT should have a
sufficiently high gain (>200) so as to minimize the required
base current. Whatever base current is required reduces the
charging current into RTCT and will reduce the oscillator
frequency.
Fault Conditions
A Fault condition occurs if VREF falls below 4.65V. When a
Fault is detected OUT is disabled. When VREF exceeds
4.80V, the Fault condition clears, and OUT is enabled.
Ground Plane Requirements
Careful layout is essential for satisfactory operation of the
device. A good ground plane must be employed. A unique
section of the ground plane must be designated for high di/dt
currents associated with the output stage. V
DD
should be
bypassed directly to GND with good high frequency
capacitors.
References
[1] Ridley, R., “A New Continuous-Time Model for Current
Mode Control”, IEEE Transactions on Power
Electronics, Vol. 6, No. 2, April 1991.
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
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PDF描述 |
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| ISL8840AABZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8840AAUZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8840AMBZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8840AMUZ | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
| ISL8841A | High Performance Industry Standard Single-Ended Current Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL8840AABZ | 功能描述:電流型 PWM 控制器 CUR MODE PWM 100% DC 7.0V UVLO 8LD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| ISL8840AABZ-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL8840AAUZ | 功能描述:電流型 PWM 控制器 CUR MODE PWM 100% DC 7.0V UVLO 8LD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| ISL8840AAUZ-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL8840AMBEP | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Rail/Tube |
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