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PDF TK11840L Data sheet ( Hoja de datos )

Número de pieza TK11840L
Descripción PWM switching regulator controller IC
Fabricantes TOKO 
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APPLICATION MANUAL
PWM switching regulator controller IC
TK11840L
CONTENTS
1 . DESCRIPTION
2 . FEATURES
3 . APPLICATIONS
4 . PIN CONFIGURATION
5 . PACKAGE OUTLINE
6 . BLOCK DIAGRAM
7 . ABSOLUTE MAXIMUM RATINGS
8 . ELECTRICAL CHARACTERISTICS
9 . TEST CIRCUIT
10 . TYPICAL CHARACTERISTICS
11 . CIRCUIT DESCRIPTION
12 . APPLICATIONS INFORMATION
13 . NOTES
14. OFFICES
2
2
2
2
2
3
4
5
6
6
8
13
15
15
GC3-I015
MEETING YOUR NEEDS
Page 1

1 page




TK11840L pdf
TK11840L
8. ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Circuit to prevent malfunction
at low input voltage
Reset voltage
Threshold voltage
Soft start
Charging current
Threshold voltage
Short circuit protection (S.C.P)
Charging current
Threshold voltage
Oscillator
Frequency
Frequency input stability
Frequency variation
with temperature
Error Amplifier
Threshold voltage
Line regulation
Variation with temperature
Input bias current
Voltage gain
Gain Band Width
Output high voltage
Output low voltage
Output source current
Output sink current
Dead time control
Maximum duty cycle
Output driver
Output high voltage
Output low voltage
Output source current
Output sink current
Pull-down resistor
Output drive control
Pin voltage
Input off condition
Input on condition
Pin current range
Entire device
Supply
Current
On mode
Off mode
Latch mode
VCC, Reset
VCC, On
ISS
VSS, TH
ISCP
VSCP, TH
fOSC
fÄV
fÄT
VEa
VEaÄV
VEaÄT
IEaIn
AV
GBW
VEaOut, High
VEaOut, Low
IEaOut, Source
IEaOut, Sink
DMAX
VOut, High
VOut, Low
IOut, Source
IOut, Sink
ROut
VBR
IBR, Off
IBR, On
IBR
ICC, On
ICC, Off
ICC, LT
MIN
-
1.1
-1.8
0.65
-1.8
0.65
440
-
-
480
-
-
-1.0
35.5
-
0.78
-
-
24
65
1.0
-
-
30
20
0.25
-15
-
-0.9
-
-
-
Value
TYP
MAX
Units
VCC=2V, Ta=25°C
Conditions
- 0.9 V
1.3 1.5 V
-1.2 -0.84 µA
0.75 0.85 V
-1.2 -0.84 µA
0.75 0.85 V
550 660 kHz
2 10 %
5 -%
VSCP=0V
VSCP=0V
Rt=3k, Ct=270pF
VCC=2.0V~10V
Ta=-20°C~85°C
500 520 mV VFB=0.45V
1
4%
VCC=2.0V~10V
1
-%
Ta=-20°C~85°C
-0.2 1.0 µA VEaIn=0V
38.5 41.5 dB
6 - MHz AV=0dB
0.87 - V
VEaIn=0V
0.05 0.2 V
VEaIn=1.0V
-40 -24 µA VFB=0.45V
40
- µA
VFB=0.45V
75 85 %
1.2 - V IOut=-15mA
0.1 0.2 V
IOut=15mA
-30 -20 mA VOut=0.9V
60
- mA
VOut=0.3V
30 40 k
0.35 0.45 V
- 0 µA
- -45 µA
- -0.1 mA
RBR=620
5.0
9.0 mA
RBR=620
0.1 1.0 µA BR/CTL Pin=VCC
5.3
9.5 mA
S.C.P. is operating
GC3-I015
Page 5

5 Page





TK11840L arduino
TK11840L
12-5. Maximum output source current
Power dissipation within the IC package is a maximum
150mW at Ta= 85°C (ambient temperature)
The power dissipation of IC increases directly with input
voltage and output current, which can be expressed as the
following relation.
PD VCC I Out,Source Duty
Fig.9 shows an allowable output current setting area
(safety area) under this condition. (150mW at Ta=85°C)
Output current must be set within the safe area. (which is
lower than 50mA and "Duty line" in application circuit.)
IOut,source,max
(Duty75%)
Maximum current
of output source
(IOut,Source=50mA)
IOut,source,max
(Duty50%)
Rb=680
Rb=1k
Soft start time (the time until the output ON duty reaches
approximately 50%) is determined by
t SS
[S]
Cscp[µF]
ISS [µA]
0.4[V]
0.33Cscp[µF]
where ISS is internal current source of 1.2µA (Typ.).
After soft start operation is over, the voltage of SCP pin
returns low and enters the short circuit detection wait
state. When an output short circuit occurs as output
suddenly drops due to load effect, the error amplifier
output is fixed at VEaOut,High and capacitor Cscp starts
charging with about 1.2µA. When the voltage of Cscp
reaches about 0.75V, the output pin (pin5) is set low and
the SCP pin (pin2) stays low.
Short circuit detection time is
t SCP
[S]
Cscp[µF]
ISCP [µA]
0.75[V]
=
0.625
Cscp[µF]
where ISCP is internal current source of 1.2µA (Typ.).
Safety area
SCP
2
Cscp
Fig 9. Output source current vs. supply voltage
Fig 10. SCP pin connection
12-6. Soft start and Short circuit detection
The TK11840L incorporates a soft start function and
short circuit detection.
A capacitor Cscp connected to the SCP pin (pin2) is a
dual purpose capacitor, one is for soft start function and
the other is for short circuit detection. When the IC is first
activated, the capacitor Cscp on the SCP pin is charged
with about 1.2µA by internal current source.
The PWM comparator compares the soft start setting
voltage as a proportion of the voltage at the SCP pin with
the sawtooth waveform. The ON duty of the output pin is
gradually increased by the PWM comparator output
signal.
Once the protection circuit operates, the timer latch
circuit can be restored by resetting the power supply.
Fig.11 shows the timing Diagram of soft start and short
circuit detection.
Note :
In application of the simple step-up circuit, the short
circuit detection circuitry is not in series with the power
path from input to load.
This short circuit detection makes the external switch
transistor turn off only.
GC3-I015
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11 Page







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