KA3511DS データシートの表示（PDF） - Fairchild Semiconductor
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KA3511DS Datasheet PDF : 18 Pages
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KA3511DS
Pin Number Pin Name
Pin Function Descrition
1
VCC Supply voltage. Operating range is 10V~30V. VCC=20V, Ta=25°C at test.
2
COMP
Error amplifier output. It is connected to non-inverting input of pulse width modulator
comparator.
3
E/A(-) Error amplifier inverting input. Its reference voltage is always 1.25V.
4
E/A(+)
Error amplifier non-inverting input feedback voltage.This pin may be used to sense
power supply output voltage.
5
TREM
Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1uF. Its high/low threshold
voltage is 1.8V/0.6V.
Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage at
this pin can reach normal 4.6V, with aDSolutely maximum voltage, 5.25V.
6
REM If REM = “Low”, PWM = “Low”. That means the main SMPS is operational.
When REM = “High”, then PWM = “High” and the main SMPS is turned-off.
7
RT
Oscillation frequency setting R. (Test Condition RT=10kΩ)
8
CT
Oscillation frequency setting C. (Test Condition CT=0.01uF)
9
DET Under voltage detection pin. Its threshold voltage is 1.25V Typ.
10
TPG
PG delay. Td=250ms (Typ) with CPG=2.2uF. The high/low threshold voltage are 1.8V/
0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin.
11
PG
Power good output signal. PG = “High” means that the power is “Good” for operation
and PG = “Low” means “Power fail”.
14
Vref Precision voltage reference trimmed to 2%. (Typical Value = 5.03V)
15
V3.3 OVP, UVP input for output 3.3V. (Typical Value = 4.1V/2.3V)
16
V5
OVP, UVP input for output 5V. (Typical Value = 6.4V/4.0V)
17
V12 OVP, UVP input for output 12V. (Typical Value = 14.2V/10V)
18
PT
This is prepared for an extra OVP input or another protection signal.
(Typical Value = 1.25V)
Timing pin for under voltage protection blank-out time. Its threshold voltage is 1.8V
19
TUVP and clamped at 2.9V after full charging. Target of delay time is 250ms and it is
realized through external (C=2.2uF).
20
GND Signal ground.
Deadtime control input. The dead-time control comparator has an effective 120mV
21
DTC
input offset which limits the minimum output dead time. Dead time may be imposed
on the output by setting the dead time control input to a fixed voltage, ranging
between 0V to 3.3V.
22
C2
Output drive pin for push-pull operation.
23
E
Power ground.
24
C1
Output drive pin for push-pull operation.
4
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