1 - 34
• Output smoothing capacitor C641, C652 : 25V_470M-M
ESR = 0.15
Ω
MAX / 20˚C, 100kHz
Tolerable ripple current = 670mArms / 105˚C, 100kHz
* Tolerable ripple current frequency compensation coefficient = 1
5V output system
Ripple voltage (specifications) = 50mVp-p
Ripple voltage =
∆
I
L
x ESR (0.15
Ω
) = 0.146Ap-p x 0.15
Ω
= 0.022Vp-p
<
=
50mVp-p
OK
Ripple current =
∆
I
L
/2 3 = 0.042 Arms
<
=
Tolerable ripple current (670mArms)
OK
3.3V output system
Ripple voltage (specifications) = 50mVp-p
Ripple voltage =
∆
I
L
x ESR (0.15
Ω
) = 0.121Ap-p x 0.15
Ω
= 0.018Vp-p
<
=
50mVp-p
OK
Ripple current =
∆
I
L
/2 3 = 0.035Arms
<
=
Tolerable ripple current (670mArms)
OK
• Input capacitor C604 : 25V_470M-M
ESR = 0.15
Ω
MAX / 20˚C, 100kHz
Tolerable ripple current = 670mArms / 105˚C, 100kHz
* Tolerable ripple current frequency compensation coefficient = 1
Ripple voltage = D
ON
(1-D
ON
)
D
ON
= V
OUT
/ V
IN
= 5.25V / 12V =0.44
= 0.44 (1-0.44)
=0.50Arms
<
=
Tolerable ripple current (670mArms)
OK
• Oscillation frequency = 1 / (C
T
x R
T
) = 1/ (330pF x 15k
Ω
) = 200kHz
Summary of Contents for LCD1550X-BK
Page 88: ...SCHEMATIC DIAGRAM POWER LCD1550X Normal Power Save 1ch Pin 4 2ch Pin 1 3ch Pin 2 4ch Pin 5 ...
Page 89: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 90: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 91: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 92: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 96: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 97: ...SCHEMATIC DIAGRAM INVERTER LCD1550X 1ch Q701 B 2ch Q702 B ...
Page 98: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Page 100: ...SCHEMATIC DIAGRAM POWER LCD1550X ...
Page 101: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 102: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 103: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 104: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 105: ...SCHEMATIC DIAGRAM PWB MAIN MC LCD1550X ...
Page 106: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 107: ...SCHEMATIC DIAGRAM INVERTER LCD1550X ...
Page 108: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Page 155: ......
Page 156: ......
Page 157: ......
Page 158: ......
Page 159: ......
Page 160: ......
Page 161: ......
Page 162: ......
Page 163: ......
Page 164: ......
Page 165: ......
Page 166: ......
Page 167: ......
Page 168: ......
Page 169: ......
Page 170: ......
Page 171: ......
Page 172: ......
Page 173: ......
Page 174: ......
Page 175: ......
Page 176: ......
Page 177: ......
Page 178: ......
Page 179: ......