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參數(shù)資料
| 型號： | TEA1204 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | High efficiency DC/DC converter |
| 中文描述： | 高效率的直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 109K |
| 代理商： | TEA1204 |
1998 Mar 02
11
Philips Semiconductors
Product specification
High efficiency DC/DC converter
TEA1204T
A typical component choice for an upconverter from
3 NiCd cells or one LiIon cell to 5.0 V in a GSM handset
(peak power 7.5 W, peak current 2.7 A) is:
L1; L = 10
μ
H; I
sat
>2.3 A; low DC resistance, e.g.
Coilcraft DO3308-103
C1; C = 100
μ
F; low ESR capacitor; necessity depends
on type of input voltage source
C2; C = 330
μ
F; ESR = 0.1
; e.g. Sprague 595D series
D1; medium power Schottky diode; e.g. Philips
PRLL5819.
For lower power applications, the I
sat
and R
DC
values of
the inductor can be scaled back by the scaling factor of the
output current from the values above. The same holds for
the ESR value of the output capacitor. A further
improvement is increase of inductance and decrease of
output capacitance.
An additional circuit to prevent start-up deadlock in
upconversion is shown in Fig.8. The function of TR1, R1
and R2 is to put the converter into shut-down mode when
the input source is suddenly disconnected. The circuit
operates as follows. When V
I
is present, TR1 conducts
and the SHDWN pin is kept LOW. As soon as V
I
falls below
1 V, TR1 no longer conducts and the device is put into
shut-down before V
O
falls below 2 V. In the event that a
signal is available which indicates the presence of the
input voltage source, this signal should be applied to the
SHDWN pin. TR1, R1 and R2 should be omitted in that
case.
More application information can be found in the
associated application note.
Fig.8 External deadlock prevention circuit.
handbook, halfpage
MGK930
SHDWN
TR1
R1
1 M
R2
2.7 M
VO
VI
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| TEA1204T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:High efficiency DC/DC converter |
| TEA1205 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:High efficiency DC/DC converter |
| TEA1205AT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:High efficiency DC/DC converter |
| TEA1206 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:High efficiency DC/DC converter |
| TEA1206T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:High efficiency DC/DC converter |
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