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PDF MIK3845A Data sheet ( Hoja de datos )
| Número de pieza | MIK3845A | |
| Descripción | CURRENT MODE PWM CONTROLLER | |
| Fabricantes | Mikron | |
| Logotipo |  |
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MIK3842A, MIK3843A
MIK3844A, MIK3845A
CURRENT MODE PWM CONTROLLER
Description
MIK3842A, MIK3843A, MIK3844A and
MIK3845A are high performance with fixed
frequency current mode PWM controllers. They
are specially designed for off-Line and DC-to-DC
converter applications with minimum external
components. These devices feature a trimmed
oscillator for precise duty cycle control, a
temperature compensated reference, high gain
error amplifier, current sensing comparator, and
high current totem pole output which is suitable
for driving MOSFETs.
The under voltage lock-out (U.V.L.O.) is
designed to operated with 0.17mA typ. start-up
current, allowing an efficient bootstrap supply
voltage design. The U.V.L.O. thresholds for the
MIK3842A/44A are 16V (on) and 10V (off) which
are ideal for off-line applications. The
corresponding typical threshold for the
MIK3843A/45A is 8.4V (on) and 7.6V (off). The
MIK3842A/43A can operated within 100% duty
cycle and the MIK3844A/45A can operated
within 50% duty cycle.
Features
Low Start-Up and Operating Current
Automatic Feed Forward Compensation
Current Mode Operating Frequency up to
500KHz
Trimmed Oscillator Discharge Current for
Precise Duty Cycle Control
Latching PWM for Cycle-By-Cycle Current
Limiting
Under Voltage Lockout with Hysteresis
High Current totem Pole Output Stage
Available Options
Device
Start-UP Hysteresis
Voltage
MIK3842A
MIK3843A
MIK3844A
MIK3845A
16V
8.4V
16V
8.4V
6V
0.8V
6V
0.8V
Max.
Duty
Cycle
< 100%
< 100%
< 50%
< 50%
Application
Off-line flyback or forward converters
DC to DC buck/boost converter
Monitor Power Supply
Rev. 1.0 – May, 2013, preliminary specification
1
© 2013 Mikron
1 page  
MIK3842A, MIK3843A
MIK3844A, MIK3845A
CURRENT MODE PWM CONTROLLER
Electrical Characteristics (TA = 0°C to 70°C, VCC=15V, CT=3.3nF, RT=10k , unless otherwise
specified)
Parameter
Symbol
Condition
Min Typ Max Unit
Undervoltage Lockout Section
Start Threshold
VTH(ST) MIK3842A, MIK3844A 14.5 16.0 17.5
V
MIK3843A, MIK3845A 7.8 8.4 9.0
Minimum Operating
VOPR(MIN) MIK3842A, MIK3844A 8.5 10 11.5 V
Voltage (after turn on)
MIK3843A, MIK3845A 7.0 7.6 8.2
PWM Section
Maximum Duty Cycle
D(MAX)
MIK3842A, MIK3843A
95
97 100 %
MIK3844A, MIK3845A 47 45 50
Minimum Duty Cycle
D(MIN)
0%
Total Standby Current
Start-Up Current
IST
0.17 0.3 mA
Operating Supply
Current
ICC(OPR)
VPIN3 = VPIN2 = 0V
13 17 mA
Zero Voltage
VZ ICC = 25mA
30 35
V
* Adjust VCC above the Startup threshold before setting to l5 V.
Note 1: Parameter measured at trip point of latch with VPIN2 = 0V
Note 2: Gain defined as A = VPIN1 / VPIN3; 0V< VPIN3 < 0.5V
Note 3: These parameters, although guaranteed, are not 1005 tested in production
Rev. 1.0 – May, 2013, preliminary specification
5
© 2013 Mikron
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MIK3845A.PDF ] | |
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