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參數(shù)資料
| 型號： | TEA1211 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | High efficiency auto-up/down DC/DC converter |
| 中文描述： | 高效率auto-up/down直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 125K |
| 代理商： | TEA1211 |
2003 Oct 13
17
Philips Semiconductors
Preliminary specification
High efficiency auto-up/down
DC/DC converter
TEA1211HN
11.2.4
F
EEDBACK RESISTORS
The fixed output voltage can be set with the feedback resistors R1 and R2 (see Fig.11). Even in case I
2
C-bus is used for
programming the output voltage, these external resistors are required for start-up. The ratio of the resistors can be
V
ref
calculated by:
, with V
ref
= V
FB
(see Chapter 10).
The two resistors in parallel should have a value of approximately 50 k
:
11.2.5
C
URRENT
L
IMITER
The maximum input peak current can be set by the current limiter as follows:
Remark.
The output current is not limited: in down conversion, the output current will be higher than the input current,
but the maximum continuous output current is not allowed to exceed 1.7 A (RMS) at 70
°
C.
Table 7
Resistor selection information
COMPONENT
VALUE
TYPE
TOLERANCE
R1, R2
R
lim
V
OUT
dependent
I
lim
dependent
SMD
SMD
1 %
1 %
R2
-V
1
–
=
R1
--1
R2
--1
+
50 k
≈
R
lim
I
IN(peak)(max)
---------1250
=
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