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參數(shù)資料
| 型號(hào)： | DCT104803P |
| 廠(chǎng)商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 440 kHz SWITCHING FREQ-MAX, PDIP22 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | DCT104803P |
DCT104803
DCT104805
SLVS407 – OCTOBER 2001
8
www.ti.com
APPLICATION INFORMATION
safety (continued)
Overvoltage protection is required to protect downstream circuitry and to ensure the output of the DCT10
complies with SELV limits during fault conditions. In the event of a single point failure of basic insulation or a
component, it is imperative that the voltage appearing across the output rails will not exceed 42.4-V peak, or
60 VDC for longer than 0.2 s. Moreover, a limit of 71-V peak, or 120 VDC will not be exceeded.
It is recommended that a clamp type circuit be applied across the output rails. In the event of a failure, this circuit
detects that an overvoltage condition has occurred and then applies a low-impedance across the output rails
forcing the input fuse to blow. Either a transorb (SMBJ6.0A manufactured by Semtech and General Instrument)
or a crowbar circuit as shown in Figure 3 can be used.
C1
100 nF, 25 Vdc
Ceramic
R1
100
,1/8 W
D1, 6V2
BZX55c6v2
+VO
0 VO
SCR1
Figure 3. Protection Circuit
layout considerations
Special care should be taken when laying out the PCB to accommodate the DCT10 module with respect to
safety, EMC, output voltage ripple/noise, and thermal performance.
safety
See the safety section in the Application Information of this document.
thermal
The main thermal path for the extraction of heat is via the pins and the host printed-circuit board. The pins that
carry the heat on the primary side of the device are pins 2 and 26, and the pins that carry the heat on the
secondary side are pins 15 and 16 and 19 and 20.
output voltage ripple/noise
Large ground loops between VO and 0 VO should be avoided. Filter capacitors should be positioned as close
as possible to these connections.
PR
O
DU
C
T
PREVIEW
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