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参数资料
| 型号： | LT1952IGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 16-SSOP |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 90% |
| 电源电压： | 6.82 V ~ 25 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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LT1952/LT1952-1
APPLICATIONS INFORMATION
48V to Isolated 12V, 20A (No Opto-Coupler)
‘Bus Converter’
The wide programmable range and accuracy of the
LT1952/LT1952-1 Volt-Second clamp makes the LT1952/
LT1952-1 an ideal choice for ‘Bus Converter’ applications
where the Volt-Second clamp provides line regulation for
the converter output. The 48V to 12V 20A ‘Bus Converter’
application in Figure16 shows a semi-regulated isolated
output without the need for an optocoupler, optocoupler
driver, reference or feedback network. Some ‘Bus Converter’
solutions run with a fixed 50% duty cycle resulting in an
output variation of 2-to-1 for applications with a 72V to
36V input range. The LT1952/LT1952-1 use an accurate
wide programmable range Volt-Second clamp to initially
program and then control power supply output voltage
to typically ± 10% for the same 36V to 72V input range.
Efficiency for the LT1952 based bus converter in Figure 16
achieves a high 94% at 20A (Figure 15). The solution is
only slightly larger than 1/4 “brick” size and uses only
ceramic capacitors for high reliability.
96.0
95.5
95.0
94.5
94.0
93.5
V IN = 48V
V OUT = 12V
93.0
4 6 8 10 12 14 16 18 20
LOAD CURRENT (A)
1952 F15
Figure 15. LT1952-Based Synchronous ‘Bus Converter’
Efficiency vs Load Current (For Circuit in Figure 16)
V IN
36V TO 72V
47k
82k
V U1
18V
BCX55
12V
BAS516
0.1μF
T1
PA0815.002
? ?
Si7370
2x
PH4840
2x
2.4μH
10k
V OUT
12V, 20A
C OUT
33μF, 16V
X5R, TDK
3x
FG
CG
6
+ 1
4
2
CS –
SYNC TIMER
C T
R T
15k
0.47μF
0.1μF
13.2k
115k
27k
59k
10k
370k
7
3
9
5
6
1
2
SD_V SEC
R OSC
BLANK
SS_MAXDC
LT1952
V REF
COMP
FB
OUT
V IN
GND
PGND
DELAY
OC
I SENSE
SOUT
14
15
8
13
12
11
10
16
BAT760
39k
470
2.2μF, 100V
2x
PH21NQ15
2x
V U1
1μF
9m
220pF
?
1μF
8V
BIAS
1nF
T2
Q4470-B
LTC3900
5 3
10k
GND CS
10k
V CC
8 7
1nF
8V
BIAS
560W
L1: PA1494.242 PULSE ENGINEERING
T1: PULSE ENGINEERING
T2: COILCRAFT
1952 F16
Figure 16. 36V to 72V Input to 12V at 20A No ‘Optocoupler’ Synchronous ‘Bus Converter’
19521fe
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1952IGN-1TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
| LT1952IGN-1TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
| LT1952IGNPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
| LT1952IGNTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
| LT1952IGNTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
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