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参数资料
| 型号： | DCT104803P |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 440 kHz SWITCHING FREQ-MAX, PDIP22 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 8/11页 |
| 文件大小： | 154K |
| 代理商： | DCT104803P |
DCT104803
DCT104805
SLVS407 – OCTOBER 2001
6
www.ti.com
APPLICATION INFORMATION
remote shutdown
The remote shutdown (RSD) allows the converter to be put into a low power dissipation state and is active low.
The RSD input can typically source 640
A and should be pulled to less than 0.8 V with respect to 0 VI. The
switch device should be rated to V(CEO) ≥ 40 V.
RSD
0 VI
Figure 2. Remote Shutdown Circuit
When using the remote shutdown, start-up load sequencing conditions apply, where the input voltage is greater
than 60 VDC. Under these conditions, the output load should not be greater than 0.25 A. As soon as the output
rail has reached the correct voltage, any specified load can be applied.
output voltage programming
The output voltage is determined by programming R4 (see Figure 1 schematic) according to the following
formula:
3.3-V variant: R4 = 24600/ (VO – Vref), where Vref is the value of the reference voltage.
R4 cannot be less than 10.25 k or greater than 14 k. For example, for a 3.3-V output, R4 = 12k.
5-V variant: R4 = 12300/(VO – Vref), where Vref is the value of the reference voltage.
R4 cannot be less than 2.9 k or greater than 3.8 k. For example, for a 5-V output, R4 = 3.3k.
Output set-point can be determined by taking into account the tolerance of R3, R4 and Vref and applying the
following formula:
V
O +
V
ref
x
R4
) R3
R4
PR
O
DU
C
T
PREVIEW
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