_VTOP
1 +
14 -
B2_P
11 U11:3
EL2257C 
4
B2_N
IX2
DR2
B3_P
1 +
14 -
U14:3 |
11 |
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EL2257C |
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4 |
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IX3
DR3
3 |
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7 |
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E |
EL2257C |
+ |
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13 |
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C |
U11:1 |
8 |
- |
2 |
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D |
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G |
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S |
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3 |
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7 |
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E |
EL2257C |
+ |
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13 |
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C |
U14:1 |
8 |
- |
2 |
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D |
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G |
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5 |
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E |
EL2257C |
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9 |
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C |
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U11:2 |
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6 |
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D
G
S
This connects to chassis gnd at the rear panel.
_SPK
_BOP
1 
2
_SPK_GND
5 |
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E |
EL2257C |
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9 |
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C |
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U14:2 |
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6 |
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D
G
S
EL2257C |
5 |
+ |
7 |
EL2257C |
3 |
+ |
1 |
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9 |
E |
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13 |
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E |
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U12:2 |
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U12:1 |
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8 |
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14 |
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C |
- |
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C |
- |
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6 |
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2 |
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D |
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D |
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G |
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G |
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S |
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S |
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1 |
_BGND |
2 |
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5 |
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7 |
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3 |
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1 |
EL2257C |
E |
+ |
EL2257C |
E |
+ |
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9 |
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13 |
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U13:2 |
C - |
8 |
U13:1 |
C - |
14 |
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6 |
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2 |
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D |
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D |
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G |
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G |
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S |
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S |
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_VBOT
PM_REF
QTY ITEM NO. |
PART NO. |
DESCRIPTION |
4 11
B1_P
U12:3
EL2257C
B1_N
IX1
DR1
B3_P
11 |
U13:3 |
|
EL2257C
4
IX4
DR4
VENDOR
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IX1 |
DR1 |
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DR3 |
IX3 |
IX2 |
DR2 |
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DR4 |
IX4 |
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VBOT |
VTOP |
BGND |
BOP |
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VBOT |
VTOP |
BGND |
BOP |
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PM_REF |
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25V- |
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C129 |
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22u |
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_BOP |
_BGND |
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14 U21:1 |
1 |
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8 |
U21:2 7 |
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13 |
2 |
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9 |
6 |
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3 |
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11 |
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C125 |
22u-25V |
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4 |
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12 |
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CA3054M96 |
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CA3054M96 |
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U21:3 |
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5 |
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CA3054M96 |
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CW |
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W |
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CCW |
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DN_DRV |
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UP_DRV |
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_VBOT |
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C126 |
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22u-25V |
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HOT |
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B3_N |
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I_MON |
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Gain = 1/37.5 |
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_V200 |
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3 |
+ |
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_BOP |
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1 |
5 |
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MUTE |
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+ |
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2 |
- |
5V=187V |
6 |
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7 |
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- |
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_N_STEP |
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Positive = Clip |
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2 |
VP |
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- |
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1 |
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Values shown preclip a fixed |
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+ |
3 |
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VN |
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5 volts below the rails up to |
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15 amps of output current. |
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After that, preclip advances |
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120 mV per ampere output, |
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2 |
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for 12v preclip at 70 amps. |
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- |
With values shown, the effective |
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6 |
- |
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1 |
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7 |
3 |
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step switch time delay is 4us |
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5 |
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+ |
flat out to 50 KHz. |
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+ |
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CLAMP_SIG |
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0.84 atten. |
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CLIP |
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3 |
+ |
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1 |
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2 |
- |
VP
PRE_LIM
-POL- |
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+15V_ |
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5 |
+ |
8 |
-POL- |
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Gain = 1.67 |
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7 |
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6 |
- |
4 |
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11 |
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3 |
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+ |
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7 |
5 |
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2 |
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-15V_ |
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1 |
- |
4 |
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8 |
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6 |
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CLIP_FEED |
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REREF
Limiter is shown in "fast clip-tracking"mode. To convert to a slow attack/release limiter, open the 3 places shown shorted with lines, and make the connection shown by the arrow line.
VP
VP
VP
VN
GAIN_RETARD
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DIFF_AMP_BIAS |
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P_ISENSE |
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N_ISENSE |
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-POL- |
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_SPK_GND |
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3 |
+ |
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5 |
+ |
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1 |
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_BOP |
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7 |
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2 |
- |
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-POL- |
6 |
- |
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+POL+ |
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+ |
14 |
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10 |
12 |
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15 |
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9 |
16 |
- |
13 |
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VP |
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Closed loop gain |
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=37.5 or 31.5 dB |
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VN |
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_SPK |
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LOSS_OF_FEEDBACK |
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DN DRV |
UP DRV |
VN |
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8 |
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SHED_V |
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7 |
SHED_V |
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6 |
PWR_GND |
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5 |
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+15V |
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PSENABLE_A |
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4 |
PSENABLE_A |
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STANDBY |
1 |
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I_SET |
3 |
I_SET |
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MSP_VMON |
2 |
MSP_VMON |
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2 |
PWR_GND |
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D_GND |
3 |
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PSENABLE_K |
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1 |
PSENABLE_K |
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MSP_IMON |
4 |
MSP_IMON |
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5 |
280 KHz LPF |
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MODE_FLAG |
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CLIP_ |
6 |
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SIG_GND |
7 |
-POL- |
2 |
- |
1 |
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3 |
+ |
+POL+ |
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CH_IN_N |
8 |
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+POL+ |
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C88 |
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9 |
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47-10NP-10% |
+POL+ |
1 |
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J6:1 |
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|||||
CH_IN_P |
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POT_TOP |
REREF |
10 |
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-POL- |
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2 |
J6:2 |
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REREF |
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11 |
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-POL- |
3 |
J6:3 |
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POST_POT_N |
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POST_POT_N |
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POST_POT_P |
12 |
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4 |
J6:4 |
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POST_POT_P |
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PRE_LIM |
13 |
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5 |
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J6:5 |
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SIG_GND |
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+15V_ |
14 |
B1_P |
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STANDBY_LED |
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6 |
J6:6 |
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STANDBY_LED |
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SMPS_V |
15 |
SMPS_ON |
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7 |
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J6:7 |
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SIG_GND |
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-15V_ |
16 |
B1_N |
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VP |
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8 |
J6:8 |
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VP |
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PRE_LIM |
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C63 |
C68 |
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9 |
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J6:9 |
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22u-25V |
22u-25V |
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VN |
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VN |
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REREF |
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J6:10 |
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10 |
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+15V |
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+15V |
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PROTECT |
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J6:11 |
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11 |
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V_MON |
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V_MON |
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LOSS_OF_FEEDBACK |
CLIP |
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J6:12 |
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12 |
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PROTECT |
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13 |
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J6:13 |
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PWR_GND |
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14 |
J6:14 |
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CLIP_FEED |
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CLIP_FEED |
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15 |
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J6:15 |
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CLIP |
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16 |
J6:16 |
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PWR_GND |
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I_SET |
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Nominal I_SET = 3ma to 5ma. |
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Amp is fully on at I_SET>1ma. |
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Above 3ma fan is unaccellerated. |
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From 3ma to 1ma speed rises. |
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Below 1ma fan speed reduces |
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back linearily to normal speed. |
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_V50 |
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1 |
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2 |
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3 |
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4 |
22u-25V |
C55 |
|
FAN_N |
|||
Fan idles at 10V up |
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to 60C. From 60C to |
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80C fan ramps from |
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10V to 24V. At 85C |
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fan V = 28V MAX. |
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|
(Note that SMPS can |
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|
also speed fan up.) |
|
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B3_N |
|
_N_STEP |
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|
5V = 100 deg C. |
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+ |
3 |
|
|
1 |
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- |
2 |
|
|
HOT=250uA |
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@ 80 deg C. |
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VP |
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HOT |
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|
U1 |
The "HOT" threshold is 80C |
||
2.5V-1% |
|||
Cutback begins at 100C and |
|||
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|||
|
full shutdown happens at 110C. |
||
|
(+/- 3 degrees) |
||
VP
SMPS_ON
C117 22u-25V
600ms delay to enable audio. 200ms delay to disable audio.
+ 5
7
- 6
SNAPPER PTC
Current gain: 22,460. 3.0 mA total set curent
results in 68A peak output. Minumum at full cut-back is 250 uA or 5.6A output.
PROTECT
VP
DIFF_AMP_BIAS
MUTE |
|
STANDBY_LED |
|
|
D |
|
G |
PSENABLE_A |
|
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|
S |
|
|
_BOP |
|
|
PSENABLE_K |
VN
_BGND
VN
_BOP
GAIN_RETARD |
6 |
- |
7
+ 5
Gain = 1/37.5
_SPK_GND
V_MON
2 |
1 |
VP |
|
3 |
|
-POL-
MSP_VMON
|
|
|
+ |
5 |
P_ISENSE |
|
|
|
7 |
|
|
|
|
|
- |
6 |
|
- |
6 |
- |
2 |
|
|
7 |
|
1 |
|
|
|
+ |
5 |
+ |
3 |
|
N_ISENSE |
Total Gain = 16.85dB
VN
I_MON
MSP_IMON
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