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LM3101M Arkusz danych(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LM3101M
Szczegółowy opis  Secondary-Side PWM Controller
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3101M Arkusz danych(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics (Continued)
Step Response
Error Amplifier
Frequency Response
Open Loop
Error Amplifier
TLH11436 – 4
Pin-by-Pin Description
Pin
Symbol
Function
Description
1RT
Frequency Setting
Connecting a resistor RT between this pin and ground programs the frequency
Resistor
from 50 kHz to 1 MHzby the following equation
RT e 025(FO  20  10b12)
F Hz X
RT also sets the internal bias current which affects the operation of several sub-
circuits within the IC
2
MC
Mode Control
For voltage mode operation connect a resistor RMC from this pin to the supply
voltage For current mode operation this pin is tied to ground via resistor RMC A
current is sourced from the pin through the resistor such that it sets the slope of the
compensating ramp ICOMP according to the equation
D
ICOMP DT e 24  103 (RT  RMC)
m
A ms 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
ISFST e 045RT
A V X
Leave this pin open if it is not used
4
SYNC
Synchronization
An external negative pulse fed to this input will synchronize the internal oscillator
Signal Input
The frequency range of the external signal should be between 11 to 15 times the
free-running frequency Connect this pin to ground if it is not used
5RSC
Short Circuit Frequency
A resistor RSC connected from this pin to the regulator output determines the
Shift Control
oscillator frequency during a short circuit by the formula
RSC e 009 (0267RT)-FSC  20 b12
F Hz X
or alternately
FSC e (120  10b12)  (0267RT) - (009RSC)
F Hz X
The recommended minimum ratio of short circuit frequency to oscillator frequency is
one-third (nominal)
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
8VOUT
Output
Output pin It produces a PWM pulse train that is fed back to the primary side of the
regulator via a pulse transformer
9VS
Supply Voltage
Supply voltage
10
CD
Crowbar Output
This pin delivers a current when an overvoltage condition occurs on the output It can
Driver
be used to fire an external SCR to crowbar the output Leave the pin open if not
used
6


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