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參數(shù)資料
| 型號： | LT1952 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single Switch Synchronous Forward Controller |
| 中文描述： | 單開關(guān)同步前進(jìn)控制器 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 252K |
| 代理商： | LT1952 |
LT1952
4
1952f
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. COMP = open, FB = 1.4V, R
OSC
= 178k, SYNC = 0V, SS_MAXDC = V
REF
,
V
REF
= 0.1
μ
F, SD_V
SEC
= 2V, BLANK = 40k, DELAY = 40k, I
SENSE
= 0V, OC = 0V, OUT = 1nF, V
IN
= 15V, SOUT = open, unless otherwise
specified.
The
●
denotes the specifications which apply over the full operating
PARAMETER
OUT Max Duty Cycle
CONDITIONS
COMP = 2.5V, FB = 1V, R
DELAY
= 10k
(f
OSC
= 200kHz)
SD_V
SEC
= 1.4V, SS_MAXDC = V
REF
COMP = 2.5V, FB = 1V, R
DELAY
= 10k
(f
OSC
= 200kHz)
SD_V
SEC
= 1.32V, SS_MAXDC = 1.84V
SD_V
SEC
= 2.64V, SS_MAXDC = 1.84V
MIN
TYP
MAX
UNITS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
The LT1952EGN is guaranteed to meet performance specifications
from 0
°
C to 125
°
C junction temperature. Specifications over the –40
°
C to
125
°
C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT1952IGN is guaranteed over the full –40
°
C to 125
°
C operating junction
temperature range.
Note 3:
Rise and Fall times are measured at 10% and 90% levels.
Note 4:
Guaranteed by correlation to static test.
Note 5:
This IC includes over-temperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125
°
C when over-temperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6:
Guaranteed but not tested.
Note 7:
Maximum recommended SYNC frequency = 500kHz.
Note 8:
In applications where the V
IN
pin is supplied via an external RC
network from a SYSTEM V
IN
> 25V, an external zener with clamp voltage
V
IN ON(MAX)
< V
Z
< 25V should be connected from the V
IN
pin to ground.
Note 9:
V
IN
start-up current is measured at V
IN
= V
IN ON
– 0.25V and
scaled by x 1.18 (to correlate to worst case V
IN
start-up current at V
IN ON
).
Note 10:
Timing for R = 40k derived from measurement with R = 240k.
83
90
%
OUT Max Duty Cycle Clamp
63.5
25
72
33
80.5
41
%
%
SOFT-START
SS_MAXDC Low Level: V
OL
SS_MAXDC Soft-Start Reset Threshold
SS_MAXDC Active Threshold
SS_MAXDC Input Current (Soft-Start Pulldown: Idis)
I
(SS_MAXDC)
= 150
μ
A, OC = 1V
Measured on SS_MAXDC
FB = 1V, DC > 0%
SS_MAXDC = 1V, SD_V
SEC
= 1.4V, OC = 1V
0.2
0.45
0.8
800
V
V
V
μ
A
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| LT1952-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
| LT1952EGN | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 16-Pin SSOP N |
| LT1952EGN#PBF | 功能描述:IC REG CTRLR ISO PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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