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PDF KA3511 Data sheet ( Hoja de datos )
| Número de pieza | KA3511 | |
| Descripción | Intelligent Voltage Mode PWM IC | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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INTELLIGENT VOLTAGE MODE PWM IC
KA3511/D
GENERAL DESCRIPTION
The KA3511/D is a fixed-frequency improved-
performance pulse-width modulation control circuit
with complete housekeeping circuitry for use in the
secondary side of SMPS (Switched mode power
supply). It contains various functions, which are
precision voltage reference, over voltage protection,
under voltage protection, remote on/off control, power
good signal generator and etc.
22-DIP-400 / 24-SOP-300
OVP (Over voltage protection) section
It has OVP functions for +3.3V,+5V,+12V and PT
outputs. The circuit is made up of a comparator with
four detecting inputs and without hysteresis voltage.
Especially, PT (Pin16) is prepared for an extra OVP
input or another protection signal.
ORDERING INFORMATION
Device Package Operating Temperature
UVP (Under voltage protection) section
KA3511
22 DIP
-25°C ~ 85°C
It also has UVP functions for +3.3V, +5V, +12V
outputs. The block is made up of a comparator with
three detecting inputs and without hysteresis voltage.
KA3511D 24 SOP
-25°C ~ 85°C
FEATURES
Remote on/off section
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Remote on/off section is used to control SMPS
externally. If a high signal is supplied to the remote on/
• Complete PWM control and house keeping
circuitry
off input, PWM signal becomes a high state and all
secondary outputs are grounded. The remote on/off
signal is transferred with some on-delay and off-delay
• Few external components
• Precision voltage reference trimmed to 2%
time of 8ms, 24ms respectively.
• Dual output for push-pull operation
DataShee
Precision reference section
The reference voltage trimmed to ± 2%
(4.9V≤Vref≤5.1V)
• Each output TR for 200mA sink current
• Variable duty cycle by dead time control
• Soft start capability by using dead time control
• Double pulse suppression logic
PG (Power good signal generator) section
Power good signal generator is to monitor the voltage
level of power supply for safe operation of a
microprocessor.
KA3511 requires few external components to
accomplish a complete housekeeping circuits for
SMPS. The KA3511 is available in a 22-pin dual in-line
package.
• Over voltage protection for 3.3V / 5V / 12V
• Under voltage protection for 3.3V / 5V / 12V
• One more external input for various protection
(PT)
• Remote on/off control function (PS-ON)
• Latch function controlled by remote and protection
input
• Power good signal generator with hysteresis
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INTELLIGENT VOLTAGE MODE PWM IC
KA3511/D
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Pin No.
1
2
3
4
5
6
7
8
9
10
11
12(14)
13(15)
14(16)
15(17)
16(18)
17(19)
18(20)
19(21)
20(22)
21(23)
22(24)
Name
VCC
COMP
E/A(-)
E/A(+)
TREM
REM
RT
CT
DET
TPG
PG
Vref
V3.3
V5
V12
PT
TUVP
GND
DTC
C2
E
C1
Function
Supply voltage. Operating range is 14V~30V. VCC=20V, Ta=25°C at test.
Error amplifier output. It is connect 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 RT=10kΩ)
Oscillation frequency setting C. (Test Condition CT=0.01uF)
Under-voltage detect pin. Its threshold voltage is 1.25V Typ.
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.
Power good output signal. PG = “High” means that the power is “Good” for operation and
PG = “Low” means “PoDwaetraSfahile”.et4U.com
DataShee
Precision voltage reference trimmed to 2%. (Typical Value = 5.03V)
Over voltage protection for output 3.3V. (Typical Value = 4.1V)
Over voltage protection for output 5V. (Typical Value = 6.2V)
Over voltage protection for output 12V. (Typical Value = 14.2V)
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.
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INTELLIGENT VOLTAGE MODE PWM IC
TYPICAL CHARACTERISTICS
KA3511/D
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0.014
0.012
0.010
0.008
0.006
0.004
0.002
0.000
0
VCC-ICC
10 20 30
Supply Voltage [V]
40
Bandgap Reference Voltage
Temperature Characteristic
5.010
5.008
5.006
5.004
5.002
-40 -20 0 20 40 60 80 100 120 140
TEMP [°C]
PIN19(Dead Time Control Voltage)-Duty Cycle
50
40
30
20
10
0
0.0
5
31.1%
21.8%
12.8%
4
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3
2
1
0.5 1.0 1.5 2.0 2.5 2.73 3.0
Deadtime Control Voltage [V]
0
3.6
OVP for 3.3V
3.8 4.0 4.2 4.4
V3.3 [V]
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4.6
7
6
5
4
3
2
1
0
5.0
OVP for 5V
5.5 6.0
V5 [V]
6.5
7.0
OVP for 12V
5
4
3
2
1
0
14.0
14.2
14.4 14.6 14.8
V12 [V]
15.0
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet KA3511.PDF ] | |
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