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LM3101 Fiches technique(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM3101
Description  Secondary-Side PWM Controller
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3101 Fiches technique(HTML) 7 Page - National Semiconductor (TI)

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Pin-by-Pin Description (Continued)
Pin
Symbol
Function
Description
11
POR
Power-On
This open-collector output is driven low when either the supply voltage falls below the
Reset Flag
Undervoltage Lockout Threshold Voltage or the output voltage is less than the Power-
on Reset Threshold Voltage Leave the pin open if not used
12
CRD
Reset Delay Capacitor
Adding a capacitor between this pin and ground sets the power-on reset flag delay
time according to the following formula
CRD e TDR 60  103
F s X
Leave the pin open if not used The POR flag will still operate if this function is not
used
13
FB
Feedback Input
A sample of the output voltage via a resistor divider is fed back into this pin which is
the inverting input of the error amplifier
14
EAO
Error Amplifier Output
Error Amplifier Output The output can source 15 mA typically and sink 300 mA
typically This pin is primarily used for loop compensation
Note
Pins 1 2 4 5 and 10 are internally clamped by a 56V zener diode Do not force a voltage larger than 5V on these pins
without a resistor to limit the current to below 1 mA All other pins are limited to the supply voltage
Test Circuit
LM3101 specifications are measured using automated
test equipment This circuit is provided for the custom-
er’s convenience when checking parameters Due to
possible variations in testing conditions the measured
values from these testing procedures may not match
those of the factory
TLH11436 – 5
This test circuit is for exercising the LM3101 functions and
measuring its specifications
With the switch positions
shown the supply current should measure 15 mA (typical)
for a supply voltage of 15V Changing the supply voltage to
5V and opening SW6 on the VOUT pin should make the
supply current 11 mA (typical) Changing SW7 to the supply
voltage will shutdown the LM3101 output
To test the oscillator section adjust the 5 kX potentiometer
at the RT pin such that the oscillator frequency is approxi-
mately 500 kHz Switch SW2 to obtain a 1 MHz frequency
(typical) The maximum duty cycle of 92% typically can also
be measured Closing SW3 on pin RSC and putting SW7 (pin
FB) in the open position will change the oscillator frequency
to approximately 180 kHz
Switching the MC pin SW1 to ground and opening SW4
the CMI pin will put the device in current mode control To
measure the current sense time delay (typically 75 ns)
close SW5 (connected to the CMI pin) and open SW6
7


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