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參數(shù)資料
| 型號： | CR-F33T |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PFM STEP-UP DC/DC CONVERTER |
| 中文描述： | PFM步升直流/直流轉換器 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大?。?/td> | 122K |
| 代理商： | CR-F33T |
3
TM
Preliminary Specification
PFM STEP-UP
DC/DC CONVERTER
CR-F33T
Electrical Characteristics
Parameter
Symbol
Test Conditions
Min.
Typ. Max. Units
Start-Up Voltage
V
ST
I
load
= 1mA
0.9
1
V
Holding Voltage
V
Hold
I
load
= 1mA
0.45
V
Input Voltage
V
IN
No Load
1
3.5
V
Output Voltage
V
DD
3
3.3
3.6
V
No-Load Input Current
I
IN
No Load
8
14
A
Standby Current
I
SB
V
EN
= 0
2
A
Input Low Voltage
V
IL
Enable/Disable Pin
0
0.4
V
Input High Voltage
V
IH
Enable/Disable Pin
1
V
DD
V
Oscillator Frequency
Fosc
150
KHz
Efficiency
V
IN
= 1.5V, I
load
= 10mA
83
%
OPERATION OF STEP-UP CONVERTER
A step-up converter diagram is illustrated below. In the diagram, the converter can
generate a fixed, higher voltage from a lower one. When SW stays ON, I
L1
flows
through L, and the converter converts the electric energy into the magnetic one and
stores it in L, in which I
max
is proportional to t
on
; when SW lies OFF, Shottky diode is
forced to be ON, while the energy stored in inductor L be discharged into capacitor,
thereby charging the output voltage to a value expected.
t
on
t
off
T=1/f
osc
I
L
t
I
Lmax
I
Lmin
C
L
L
D
I
L1
I
out
+
--
V
IN
+
--
I
L2
SW
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