參數(shù)資料
型號: LX1552ID-TR
廠商: MICROSEMI CORP
元件分類: 穩(wěn)壓器
英文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
封裝: ROHS COMPLIANT, PLASTIC, SOIC-14
文件頁數(shù): 13/18頁
文件大小: 475K
代理商: LX1552ID-TR
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
LX1552/3/4/5
PRODUCT D A T ABOOK 1996/1997
Copyright 1994
Rev. 1.0b
4
P RODUCTIO N D ATA
S HEET
ELECTRICAL CHARACTERISTIC S
(Con't.)
Under-Voltage Lockout Section
Parameter
Symbol
Test Conditions
Start Threshold
V
ST
1552/1554
1553/1555
Min. Operation Voltage After Turn-On
1552/1554
1553/1555
LX155xC
Units
Min. Typ. Max. Min. Typ. Max.
LX155xI/155xM
15
16
17
15
16
17
V
7.8
8.4
9.0
7.8
8.4
9.0
V
9
10
11
9
10
11
V
7.0
7.6
8.2
7.0
7.6
8.2
V
PWM Section
Maximum Duty Cycle
1552/1553
1552/1553, R
T = 698, CT = 22nF
1554/1555
Minimum Duty Cycle
94
96
94
96
%
50
%
47
48
47
48
%
0
%
Power Consumption Section
Start-Up Current
I
ST
Operating Supply Current
I
CC
V
CC Zener Voltage
V
Z
I
CC = 25mA
150
250
150
250
A
11
17
11
17
mA
30
35
30
35
V
Notes: 2. These parameters, although guaranteed, are not 100% tested in
production.
3. Parameter measured at trip point of latch with V
FB = 0.
4. Gain defined as: A =
; 0
≤ V
ISENSE
0.8V.
5. Adjust V
CC above the start threshold before setting at 15V.
6. Output frequency equals oscillator frequency for the LX1552 and
LX1553. Output frequency is one half oscillator frequency for the
LX1554 and LX1555.
7. Temperature stability, sometimes referred to as average temperature
coefficient, is described by the equation:
Temp Stability =
V
REF
(max.) & V
REF
(min.) are the maximum & minimum reference
voltage measured over the appropriate temperature range. Note that the
extremes in voltage do not necessarily occur at the extremes in
temperature.
V
REF
(max.) - V
REF
(min.)
T
A
(max.) - T
A
(min.)
V
COMP
V
ISENSE
BLOCK DIAGRAM
* - VCC and VC are internally connected for 8 pin packages.
** - POWER GROUND and GROUND are internally connected for 8 pin packages.
*** - Toggle flip flop used only in 1554 and 1555.
OSCILLATOR
S
R
***
V
REF
GOOD LOGIC
INTERNAL
BIAS
S / R
5V
REF
PWM
LATCH
CURRENT SENSE
COMPARATOR
1V
R
2R
ERROR AMP
16V (1552/1554)
8.4V (1553/1555)
16V (1552/1554)
8.4V (1553/1555)
UVLO
34V
GROUND**
V
CC*
R
T/CT
V
FB
T
COMP
I
SENSE
POWER GROUND**
OUTPUT
V
C*
V
REF
相關PDF資料
PDF描述
LX1554ID-TR 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
LX1554CPW-TR 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20
LX1552CD-TR 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
LX1552CPW-TR 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20
LX1662ACD-TR 1.5 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO14
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