- 您现在的位置：买卖IC网 > PDF目录15208 > ISL8844AAUZ-T (Intersil)IC REG CTRLR BST FLYBK ISO 8MSOP PDF资料下载
参数资料
| 型号： | ISL8844AAUZ-T |
| 厂商： | Intersil |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK ISO 8MSOP |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 50% |
| 电源电压： | 9 V ~ 30 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
ISL8840A, ISL8841A, ISL8842A, ISL8843A, ISL8844A, ISL8845A
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.
13
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.
FN6320.3
April 18, 2007
相关PDF资料 |
PDF描述 |
|---|---|
| AMC07DRTH | CONN EDGECARD 14POS .100 DIP SLD |
| VE-B4J-EV-F3 | CONVERTER MOD DC/DC 36V 150W |
| ASC12DRES | CONN EDGECARD 24POS .100 EYELET |
| AMC07DREN | CONN EDGECARD 14POS .100 EYELET |
| AMC07DREH | CONN EDGECARD 14POS .100 EYELET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8844AMBEP | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Rail/Tube |
| ISL8844AMBEP-TK | 制造商:Intersil Corporation 功能描述:CURRENT MODE PWM CNTRLR 1A 8SOIC N - Tape and Reel |
| ISL8844AMBEPZ | 制造商:Intersil Corporation 功能描述:PB-FREE, -55 TO +125, CURRENT MODE PWM, 50% DC,14.4V UVLO,8L - Rail/Tube |
| ISL8844AMBEPZ-TK | 制造商:Intersil Corporation 功能描述:PB-FREE,-55 TO +125,CURRENT MODE PWM,50% DC,14.4V UVLO,8LD S - Tape and Reel |
| ISL8844AMBZ | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。