參數(shù)資料
型號(hào)： TK65218M
廠商： TOKO INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
中文描述： SWITCHING REGULATOR, PDSO6
封裝： SOT-23L, SMT-6
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 141K
代理商： TK65218M
ADVANCED INFORMATION
January 1999 TOKO, Inc.
Page 17
TK652xx
THE AMOUNT OF BOARD SPACE NEEDED TO IMPLEMENT THIS STEP-DOWN CONVERTER
An evaluation board for this converter has been made using a TOKO D73 or D75 series inductor, using only 0.96 sq.
inches of board space. The artwork for the surface-mount circuit board is shown below in Figure 4.
FIGURE 4: TK652xx STEP-DOWN CONVERTER EVALUATION BOARD ARTWORK
SELECTING INPUT RESISTOR DIVIDER VALUES
Since the TK652xx draws so little quiescent current into V
IN
, relatively large resistance values can be used in the
input resistor divider. The following shows the relationship equation between V
BATT
and V
IN
pin of the TK652xx, and
an example method of finding the resistor values to be used in the resistor divider.
(1)
therefore:
and typical (I
Q
of V
IN
) = 15
μ
A and typical LBI trigger value of V
IN
= 1.1 V and letting R
1
= 10 k solving for R
2
:
then for the case of 4 NiMH cells picks a LBI trigger at V
BATT
= 4.4 V, then R
2
= 3.97 k
STEP-DOWN CONVERTER APPLICATION (CONT.)
G
G
VIN
VOUT
L
L
Actual Size
1.2 "
.
10 k x 1.25 V
V
BATT
- 1.25 V
R
2
=
(R
1
+ R
2
)
V
BATT
X R
2
V
IN
=
- R
1
x (I
Q
of V
IN
)
x [ V
IN
+ R
1
x (I
Q
of V
IN
)]
R
2
R
1
+ R
2
V
BATT
=
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PDF描述
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