參數(shù)資料
型號(hào)： LM3101
廠商： National Semiconductor Corporation
英文描述： Secondary-Side PWM Controller
中文描述： 二次側(cè)PWM控制器
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 319K
代理商： LM3101
Typical Performance Characteristics
(Continued)
Step Response
Error Amplifier
Frequency Response
Open Loop
Error Amplifier
TL/H/11436–4
Pin-by-Pin Description
Pin
Y
Symbol
Function
Description
1
R
T
Frequency Setting
Resistor
Connecting a resistor, R
T
, between this pin and ground programs the frequencyD
from 50 kHz to 1 MHzDby the following equation:
R
T
e
0.25/(F
O
#
20
#
10
b
12
)
R
T
also sets the internal bias current, which affects the operation of several sub-
circuits within the IC.
[
F, Hz,
X
]
.
2
MC
Mode Control
For voltage mode operation, connect a resistor, R
MC
, from this pin to the supply
voltage. For current mode operation, this pin is tied to ground via resistor R
MC
. A
current is sourced from the pin through the resistor such that it sets the slope of the
compensating ramp, I
COMP
, according to the equation:
D
I
COMP
/
D
T
e
24
#
10
3
/(R
T
#
R
MC
)
[
m
A/
m
s,
X
]
.
3
SFST
Soft-Start Control
A series resistor-capacitor network tied from this pin to ground provides Soft-Start
capability. The current charging the capacitor is:
I
SFST
e
0.45/R
T
.
Leave this pin open if it is not used.
[
A, V,
X
]
.
4
SYNC
Synchronization
Signal Input
An external negative pulse fed to this input will synchronize the internal oscillator.
The frequency range of the external signal should be between 1.1 to 1.5 times the
free-running frequency. Connect this pin to ground if it is not used.
5
R
SC
Short Circuit Frequency
Shift Control
A resistor, R
SC
, connected from this pin to the regulator output, determines the
oscillator frequency during a short circuit by the formula:
R
SC
e
0.09/
[
(0.267/R
T
) - F
SC
#
20
#
b
12
]
or, alternately,
F
SC
e
(1/20
#
10
b
12
)
#
[
(0.267/R
T
) - (0.09/R
SC
)
]
The recommended minimum ratio of short circuit frequency to oscillator frequency is
one-third (nominal).
[
F, Hz,
X
]
.
[
F, Hz,
X
]
.
6
CMI
Current Mode Input
An analog voltage signal, proportional to the transformer primary current, fed to this
input results in current mode operation. Connect this pin directly to ground if
selecting voltage mode operation.
7
GND
Ground
Ground.
8
V
OUT
Output
Output pin. It produces a PWM pulse train that is fed back to the primary side of the
regulator, via a pulse transformer.
9
V
S
Supply Voltage
Supply voltage.
10
CD
Crowbar Output
Driver
This pin delivers a current when an overvoltage condition occurs on the output. It can
be used to fire an external SCR to crowbar the output. Leave the pin open if not
used.
6
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3101M 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Secondary-Side PWM Controller
LM3101N 制造商:Texas Instruments 功能描述:
LM3102 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:SIMPLE SWITCHER㈢ Synchronous 1MHz 2.5A Step-Down Voltage Regulator
LM3102EVAL 功能描述:BOARD EVALUATION LM3102 RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise®, SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類(lèi)型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類(lèi)型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
LM3102EVAL/NOPB 功能描述:電源管理IC開(kāi)發(fā)工具 LM3102 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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