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| 型号： | LT1533IS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG PUSH-PLL CTRLR ISO 16SOIC |
| 标准包装： | 50 |
| 类型： | 推挽式控制器，隔离式 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.3 V ~ 30 V |
| 输入电压： | 2.7 V ~ 23 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 250kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1533
APPLICATIO N S I N FOR M ATIO N
Output ripple current at maximum input (DC = 34.7%) is:
NOMINAL
NOMINAL
OUTPUT VOLTAGE
COILTRONICS
? I OUT =
12 ( 1 ? 2 ? 34 . 7 % ) = 92 mA
800 μ H ? 50 kHz
INPUT
VOLTAGE
5V
5V
5V
AFTER LINEAR
REGULATOR
12V
12V
± 15V
OUTPUT
POWER
1.5W
3.0W
1.5W
PART
NUMBER
CTX02-13716-X1
CTX02-13665-X1
CTX02-13713-X1
CONNECTION
DIAGRAM
A
A
B
The maximum inductor current is:
5V
5V
5V
± 15V
12V
12V
3.0W
1.5W
10W
CTX02-13664-X1
CTX02-13834-X3*
CTX02-13949-X1
B
A
A
I LMAX = 150 mA +
92mA
2
= 196 mA
2
A
12
2
B
12
= 309 μ H
L PRI =
Primary inductance should be greater than:
5 ? 800 μ H
3 . 6 2
PRIMARY A
3
4
PRIMARY B
5
SECTION A
10
9
SECTION B
7
PRIMARY A
3
4
PRIMARY B
5
SECTION A
10
9
SECTION B
7
TIE OUTPUT
COMMON TO
THIS POINT
The magnetizing ripple current is approximately:
= TIED TOGETHER
* = HIGH TURNS RATIO VERSION OF CTX-02-13716-X1.
ACCOMMODATES LOW SUPPLY VOLTAGES OR
? I MAG =
12 + 0 . 5
3 . 6 ? 309 μ H ? 50 kHz
= 225 mA
HIGH DROPOUT REGULATORS
Figure 5. Transformers for Typical Applications
1533 F05
Peak switch current is:
I SW(PEAK) = 3.6 ? 196mA + 225mA = 930mA
which is less than the 1A maximum switch current.
Note that you can discern your magnetizing ripple by
looking at the reflected inductance ripple and subtracting
the switch current ripple.
? I MAG = N ? ? I L – ? I SW
With knowledge of turns ratio and primary inductance
along with volt/sec requirements (to prevent saturation)
the transformer can be designed.
Transformers are available from Coiltronics for some
standard applications. Figure 5 lists them. Variations are
available from Coiltronics at 561-241-7876. Also, see
Linear Technology’s Application Notes AN19, AN44 and
AN70 for further information about magnetics.
Capacitors
Correct choice of input and output capacitors can be very
important to low noise switcher performance. Push-pull
topologies and other low noise topologies will in general
have continuous currents which reduce the requirements
for capacitance. However, noise depends more on the ESR
of the capacitors.
Input capacitors must also withstand surges that occur
during the switching of some types of loads. Some solid
tantalum capacitors can fail under these surge conditions.
Design Note 95 offers more information but the following
is a brief summary of capacitor types and attributes.
Aluminum Electrolytic: Low cost and higher voltage but in
general don’t use with this part because of high ESR and
poor high frequency performance.
Specialty Polymer Aluminum: Panasonic has come out
with their series CD capacitors. While they are only avail-
able for voltages below 16V, they have very low ESR and
good surge capability.
Solid Tantalum: Small size and low impedance. Typically
available for voltages below 50V. Possible problem with
surge currents (AVX TPS line addresses this issue).
OS-CON: Lower impedance than aluminum but only avail-
able for 25V or less. Form factor may be a problem.
Sometimes their very low ESR can cause loop stability
problems.
13
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