ka3511bs Fairchild Semiconductor, ka3511bs Datasheet - Page 4

• Manufacturer Part Number: ka3511bs
• Description: Intelligent Voltage Mode Pwm Ic
• Manufacturer: Fairchild Semiconductor

KA3511BS
4
Pin Number Pin Name
10
11
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
COMP
E/A(+)
TREM
E/A(-)
T
REM
GND
V3.3
DTC
V
DET
T
Vref
V12
PG
RT
CT
V5
PT
UVP
C2
C1
CC
PG
E
Under voltage detection pin. Its threshold voltage is 1.25V Typ.
OVP, UVP input for output 3.3V. (Typical Value = 4.1V/2.3V)
OVP, UVP input for output 5V. (Typical Value = 6.2V/4.0V)
OVP, UVP input for output 12V. (Typical Value = 14.2V/10V)
Supply voltage. Operating range is 10V~30V. V
Error amplifier output. It is connected to non-inverting input of pulse width modulator
comparator.
Error amplifier inverting input. Its reference voltage is always 1.25V.
Error amplifier non-inverting input feedback voltage.This pin may be used to sense
power supply output voltage.
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 absolutely maximum voltage, 5.25V.
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.
Oscillation frequency setting R. (Test Condition R
Oscillation frequency setting C. (Test Condition C
PG delay. Td=250ms (Typ) with C
0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin.
Power good output signal. PG = “High” means that the power is “Good” for operation
and PG = “Low” means “Power fail”.
Precision voltage reference trimmed to 2%. (Typical Value = 5.03V)
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
and clamped at 2.9V after full charging. Target of delay time is 250ms and it is
realized through external (C=2.2uF).
Signal ground.
Deadtime control input. The dead-time control comparator has an effective 120mV
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.
Output drive pin for push-pull operation.
Power ground.
Output drive pin for push-pull operation.
Pin Function Descrition
PG
=2.2uF. The high/low threshold voltage are 1.8V/
CC
T
T
=20V, Ta=25 C at test.
=10k )
=0.01uF)