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参数资料
| 型号： | PTN04050CAZ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-4 |
| 文件页数： | 4/19页 |
| 文件大小： | 640K |
| 代理商： | PTN04050CAZ |
V
I
V
O
PWM
IC
1
3
4
2
GND
Adj
GND
* Seethe
sectionforsuggestedvalueandtype.
ApplicationInformation
VI
VO
PTN04050C
VI
VO
RSET
C4
22 F
Ceramic
m
C1
22 F
Ceramic
m
C2
10
*
0 F
(Required)
m
C3
(
*
100 F
Required)
m
SLTS251A
– SEPTEMBER 2005 – REVISED FEBRUARY 2011
Boost Topology
With boost regulators an output voltage of approximately (VI - 300 mV) is present whenever the input voltage to
the module is below the minimum input voltage range, or during an overtemperature condition. Also, a boost
regulator cannot provide inherent short-circuit protection. This is due to the fact that there is a dc path from the
input to the output even when the PWM and FET are not operating. This is shown in the boost topology diagram
in Figure 16.
Figure 16. Typical Boost Converter Topology
Optional Input/Output Filters
Power modules include internal input and output ceramic capacitors in all their designs. However, some
applications require much lower levels of either input reflected or output ripple/noise. This section describes
various filters and design techniques found to be successful in reducing both input and output ripple/noise.
Input/Output Capacitors
A first step toward reducing output ripple and noise is to add one or more 22-
μF ceramic capacitors, such as C4
shown in Figure 17. Ceramic capacitors should be placed close to the output power terminals. A single 22-
μF
capacitor reduces the output ripple/noise by 10% to 30% for modules with a rated output current of less than 3 A.
(Note: C3 is recommended to improve the regulators transient response and does not reduce output ripple and
noise.)
Switching regulators draw current from the input line in pulses at their operating frequency. The amount of
reflected (input) ripple/noise generated is directly proportional to the equivalent source impedance of the power
source including the impedance of any input lines. The addition of C1, minimum 22-
μF ceramic capacitor, near
the input power pins, reduces reflected conducted ripple/noise by 30% to 50%.
Figure 17. Adding High-Frequency Bypass Capacitors To The Input and Output
12
2005–2011, Texas Instruments Incorporated
Product Folder Link(s): PTN04050C
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