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参数资料
| 型号： | LTC3803ES6-5#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK PWM TSOT23-6 |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 230kHz |
| 占空比： | 90% |
| 电源电压： | 4 V ~ 8.1 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 剪切带 (CT) |
| 相关产品： | 732-2263-6-ND - TRANS FLYBACK LTC3803 16.9UH 732-2263-1-ND - TRANS FLYBACK LTC3803 16.9UH 732-2263-2-ND - TRANS FLYBACK LTC3803 16.9UH |
| 其它名称： | LTC3803ES6-5 LTC3803ES6-5#TRMCT LTC3803ES6-5-ND |
LTC3803-5
APPLICATIONS INFORMATION
Many LTC3803-5 application circuits can be derived from
the topology shown in Figure 2.
The LTC3803-5 itself imposes no limits on allowed power
output, input voltage V IN or desired regulated output voltage
V OUT ; these are all determined by the ratings on the external
power components. The key factors are: Q1’s maximum
drain-source voltage (BV DSS ), on-resistance (R DS(ON) )
and maximum drain current, T1’s saturation ?ux level and
winding insulation breakdown voltages, C IN and C OUT ’s
maximum working voltage, ESR, and maximum ripple
current ratings, and D1 and R SENSE ’s power ratings.
Choose resistance values for R1 and R2 to be as large as
possible in order to minimize any ef?ciency loss due to
the static current drawn from V OUT , but just small enough
so that when V OUT is in regulation, the error caused by
the nonzero input current to the V FB pin is less than 1%.
A good rule of thumb is to choose R1 to be 80k or less.
TRANSFORMER DESIGN CONSIDERATIONS
Transformer speci?cation and design is perhaps the most
critical part of applying the LTC3803-5 successfully. In
addition to the usual list of caveats dealing with high fre-
R VCC
V IN
C IN L PRI
?
T1
D1
L SEC
C OUT
V OUT
quency power transformer design, the following should
prove useful.
Turns Ratios
C VCC
C C
1
2
5
V CC
I TH /RUN NGATE
LTC3803-5
GND SENSE
V FB
3
R1 R2
6
4
R SL
?
Q1
R SENSE
38035 F02
Due to the use of the external feedback resistor divider
ratio to set output voltage, the user has relative freedom
in selecting transformer turns ratio to suit a given appli-
cation. Simple ratios of small integers, e.g., 1:1, 2:1, 3:2,
etc. can be employed which yield more freedom in setting
total turns and mutual inductance. Simple integer turns
ratios also facilitate the use of “off-the-shelf” con?gu-
rable transformers such as the Coiltronics VERSA-PAC?
Figure 2. Typical LTC3803-5 Application Circuit
SELECTING FEEDBACK RESISTOR DIVIDER VALUES
The regulated output voltage is determined by the resistor
divider across V OUT (R1 and R2 in Figure 2). The ratio
of R2 to R1 needed to produce a desired V OUT can be
calculated:
series in applications with high input to output voltage
ratios. For example, if a 6-winding VERSA-PAC is used
with three windings in series on the primary and three
windings in parallel on the secondary, a 3:1 turns ratio
will be achieved.
Turns ratio can be chosen on the basis of desired duty
cycle. However, remember that the input supply voltage
R2 =
V OUT – 0.8V
0.8V
? R1
plus the secondary-to-primary referred version of the
?yback pulse (including leakage spike) must not exceed
the allowed external MOSFET breakdown rating.
38035fd
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3803ES6TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Flyback 75V TSOT23-6 |
| LTC3803HS6#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Flyback Controller 6-Pin TSOT-23 Bulk 制造商:Linear Technology 功能描述:Switching Regulator IC 制造商:Linear Technology 功能描述:IC, FLYBACK DC/DC CONTROLLER, 6-TSOT-23; Primary Input Voltage:72V; No. of Outputs:1; Output Current:1A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:150C; MSL:MSL 1 - Unlimited; Output Current Max:2A ;RoHS Compliant: Yes |
| LTC3803HS6#TRMPBF | 功能描述:IC REG CTRLR FLYBK PWM TSOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3803HS6#TRPBF | 功能描述:IC REG CTRLR FLYBK PWM TSOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3803HS6-3#PBF | 制造商:Linear Technology 功能描述:Bulk |
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