M62212P Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC
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M62212P Datasheet PDF : 8 Pages
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MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>
M62212P/FP/GP
GENERAL PURPOSE DC-DC CONVERTER
3.CONSTANT DEFINITION
CONSTANT Step-down converter Step-up converter Inverting converter
TON
TOFF
VO + VF
VIN - VCE(sat) - VO
VO + VF - VIN
VIN - VCE(sat)
|Vo| + VF
VIN - VCE(sat)
TON + TOFF
1
fOSC
1
fOSC
1
fOSC
TOFF (MIN)
TON + TOFF
1+
TON
TOFF
TON + TOFF
1+
TON
TOFF
TON + TOFF
1+
TON
TOFF
TON (MAX)
1
-TOFF
fOSC
1
-TOFF
fOSC
1
-TOFF
fOSC
D (MAX)
COSC
L (MIN) (*1)
R1 (*1,*2)
RDTC
(*4)
not use short
protection
use short
protection
TON(MAX)
TON + TOFF
1
75 * 10 3 * fosc
-16 * 10 -12
(VIN - VCE(sat) - VO) * TON(MAX)
∆IO
VO
-1 * R2
VREF
VDTC(MAX)
| ICH1 |
VDTC(MAX)
| ICH2 |
TON(MAX)
TON + TOFF
1
75 * 10 3 * fosc
-16 * 10 -12
(VIN -VCE(sat))2 * TON(MAX)2 * fOSC
2 * VO * IO
VO
-1 * R2
VREF
VDTC(MAX)
| ICH1 |
VDTC(MAX)
| ICH2 |
TON(MAX)
TON + TOFF
1
75 * 10 3 * fosc
-16 * 10 -12
(VIN -VCE(sat)) 2 * TON(MAX)2 * fOSC
2 * VO * IO
|VO|
-1 *R2
VREF
VDTC(MAX)
| ICH1 |
VDTC(MAX)
| ICH2 |
CDTC
(*4)
calicurate from
start-up time
calicurate from
shat down time
| ICH1 | * tstart
VDTC(MAX)
IDIS1 * tshort
VDTC(MAX) -VOSCL
| ICH1 | * tstart
VDTC(MAX)
IDIS1 * tshort
VDTC(MAX) -VOSCL
| ICH1 | * tstart
VDTC(MAX)
IDIS1 * tshort
VDTC(MAX) -VOSCL
VF : Forward Voltage of outer Diode.
VCE(sat) : Saturation Voltage of M62212 or Saturation Voltage of Current buffer Transistor.
Åô Please setting the Oscillation frequency first and calicurate each constant value.
*1 : Please setting ŢIo about 1/3 to 1/5 of maximum output current.
*2 :|Vo|= (1+
R1
R2
) * VREF
*3 : Please settng R2 about few KÉ∂ to score of KÉ∂ because output voltage don't
undergo
a influence of input current (Terminla 7).
*4 : Please setting VDTC(MAX) to satisfy D(MAX), fixed from caracteristics of D(MAX) - VDTC(MAX).
ICH1 means DTC charge current when start-up(-45µA typ), ICH2 means DTC charge current
when stable state(-10µA typ), VOSCL means lower limit vlage of oscillation waveform
(0.45V typ), and IDIS1 means DTC discharge current 1(50µA typ).
tstart means time internval when terminal vltage of DTC increase to VOSCL from lower voltage
and to start switching at first.
tshort means time interval when output is shut down after output is shorted.
( 8/ 8 )
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