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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LM3101 |
Pin-by-Pin Description
(Continued)
Pin
Y
Symbol
Function
Description
11
POR
Power-On
Reset Flag
This open-collector output is driven low when either the supply voltage falls below the
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
C
RD
Reset Delay Capacitor
Adding a capacitor between this pin and ground sets the power-on reset flag delay
time according to the following formula:
C
RD
e
T
DR
/60
#
10
3
Leave the pin open if not used. The POR flag will still operate if this function is not
used.
[
F, s,
X
]
.
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 1.5 mA typically and sink 300
m
A
typically. This pin is primarily used for loop compensation.
Note:
Pins 1, 2, 4, 5, and 10 are internally clamped by a 5.6V 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.
TL/H/11436–5
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 V
OUT
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 k
X
potentiometer
at the R
T
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 R
SC
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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