Text preview for : QSC-PL9.0PFC pwramp.pdf part of QSC PL9.0PFC power amplifier
Back to : QSC-PL9.0PFC pwramp.pdf | Home
_VTOP
3
5
5
1
+
E C
EL2257C
13
7
+
E C
EL2257C
9
EL2257C
9
E
+
7
EL2257C
13
3
E C + -
1
14
-
8
U12:2
C -
2
6
6
D
D
D
G
G
G
D
G
S
S
S
B2_P
S
2
U11:1
-
8
U12:1
14
U11:2
B1_P
11
U11:3 EL2257C
4
B2_N
4
11
U12:3 EL2257C
B1_N
This connects to chassis gnd at the rear panel.
_SPK IX2 _BOP
1 2 1 2
IX1 _BGND
DR2 _SPK_GND
DR1
B3_P
B3_P
3
5
5
1
+
E C
EL2257C
13
7
+
E C
EL2257C
9
EL2257C
9
E C
+
7
3
EL2257C
13
E C
+
1
14
-
8
2
6
6
D
D
D
G
G
G
D
G
S
S
S
11
S
2
U14:1
-
U14:2
U13:2
-
8
U13:1
-
14
U14:3 EL2257C
4
_VBOT
IX3 IX4
DR3 DR4 PM_REF
QTY
ITEM NO.
PART NO.
DESCRIPTION
4
11
U13:3 EL2257C
VENDOR
DR1
DR3
DR2
DR4
IX1
IX3
IX2
_BGND
_VBOT
_VTOP
_VBOT
_VTOP
_BOP
_BGND
PM_REF
C129 22u-25V
_BOP
_BGND
14 13
U21:1
1 2 3
8 9 11 12
U21:2
7 6
22u-25V
C125
4
CA3054M96 U21:3
5
CA3054M96
CA3054M96
CW
W
CCW
DN_DRV _VBOT
UP_DRV
C126 22u-25V
HOT
B3_N
_BOP
IX4
I_MON DIFF_AMP_BIAS
Gain = 1/37.5
650mV pk excursion
_V200 P_ISENSE
3
+ 1 5 + 7
_BOP MUTE
2
-
5V=187V
N_ISENSE
6
-
_N_STEP
-POLPositive = Clip
1 2
VP
_SPK_GND
3 5 + 7 2
+ 1 _BOP
Values shown preclip a fixed 5 volts below the rails up to 15 amps of output current. After that, preclip advances 120 mV per ampere output, for 12v preclip at 70 amps.
6 7 5 +
+
3
VN
6
-
+POL+
+ 10 12 14 15
-POL-
2
1
3
+
9
With values shown, the effective step switch time delay is 4us flat out to 50 KHz.
16
-
13
VP CLAMP_SIG
0.84 atten. 5.95Vpk clips amp.
CLIP
Closed loop gain =37.5 or 31.5 dB 5.0 Vp=187.5 Vp
VN
_SPK
3
+ 1
2
-
VP PRE_LIM
-POL-POL5 +
+15V_
10 Vpk clips the amp with NO LOAD.
8
Gain = 1.67
7 6
-POL11
+ 3 2 7 5
LOSS_OF_FEEDBACK
4
-
1
-15V_
6
-
4
CLIP_FEED
8
DN_DRV
REREF VP
VP
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.
VN
VP
GAIN_RETARD
UP_DRV
VN
8
SHED_V
7
SHED_V
6
PWR_GND
5
+15V
PSENABLE_A
4
PSENABLE_A
STANDBY
1
I_SET
3
I_SET
MSP_VMON
2
MSP_VMON
2
PWR_GND
D_GND
3
PSENABLE_K
1
PSENABLE_K
MSP_IMON
4
MSP_IMON
MODE_FLAG
5
280 KHz LPF
CLIP_
6
SIG_GND
7
-POL-
2
1
3 8
+
+POL+
C88 47-10NP-10%
CH_IN_N
+POL+
CH_IN_P
9
+POL+
1
J6:1
POT_TOP
REREF
10
-POL-POL3
2
J6:2
REREF
POST_POT_N
11
J6:3
POST_POT_N
POST_POT_P
12
4
J6:4
POST_POT_P
PRE_LIM
13
5
J6:5
SIG_GND
+15V_
14
B1_P
STANDBY_LED
6
J6:6
STANDBY_LED
SMPS_V
15
SMPS_ON
7
J6:7
SIG_GND
-15V_
16
B1_N PRE_LIM
VP
8
J6:8
VP
C63 22u-25V
C68 22u-25V
REREF
VN
9
J6:9
VN
+15V
10
J6:10
+15V
PROTECT V_MON
11
J6:11
V_MON
LOSS_OF_FEEDBACK
CLIP
12
J6:12
PROTECT
13
J6:13
PWR_GND
CLIP_FEED
14
J6:14
CLIP_FEED
15
J6:15
CLIP
16
J6:16
PWR_GND
VP
Current gain: 22,460. 3.6 mA total set curent results in 81A peak output. Minumum at full cut-back is 250 uA or 5.6A output.
PROTECT
VP DIFF_AMP_BIAS
SMPS_ON
MUTE
STANDBY_LED
G
D
PSENABLE_A
I_SET _BOP
S
C117 22u-25V
Nominal I_SET = 3ma to 5ma. Amp is fully on at I_SET>1ma. Above 3ma fan is unaccellerated. From 3ma to 1ma speed rises. Below 1ma fan speed reduces back linearily to normal speed.
PSENABLE_K
VN
_BGND _V50
1 2
600ms delay to enable audio. 200ms delay to disable audio.
VN
_BOP
3
22u-25V
4
GAIN_RETARD
C55
7
6
FAN_N
186V = 5V
+
5
Gain = 1/37.5
_SPK_GND
Fan idles at 10V up to 60C. From 60C to 80C fan ramps from 10V to 24V. At 85C fan V = 28V MAX. (Note that SMPS can also speed fan up.)
V_MON
+ 7 -
5
2
1
VP
6
3
-POLMSP_VMON B3_N _N_STEP
SNAPPER PTC
+ 7 6 1 + 5 + 3 2
5
P_ISENSE
6
5V = 100 deg C.
7
N_ISENSE
+ 1 -
3
VN
Total Gain = 16.85dB 70A = 5V >5V = Current Limiting.
2
HOT=250uA @ 80 deg C.
VP I_MON
HOT MSP_IMON
U1 2.5V-1%
The "HOT" threshold is 80C Cutback begins at 100C and full shutdown happens at 110C. (+/- 3 degrees)
Clamps caps to 48-54V
_V200
_V150
G 5 + 7 6 5
_V150
_N_STEP
+ 7
NOTE: This opamp must not clamp its input terminals together. TL072 or EQIV!!!
5 + 7 6
CLAMP_SIG VN
6
-
-
3
VN
+ 1
2
-
V_MON
D
S
G
G
S
D
S
D
5
_V100
4
_V100
LOSS_OF_FEEDBACK
5
3 + 7 3 + 1 2 2 1
6
-
_N_STEP
VN VN VN
PROTECT
G
_V50 _V50
3
+ 1 5 + 7 6 -
2
-
_N_STEP
VN
VN
S
B4_P
+
SHED_V
3
22u-25V
22u-25V
-
3 volts here signifies 50 amps output, so load is likely 2 ohms.
B4_N
C19
2
C49 22u-25V
1
C48
D
_VTOP
VN _VBOT
I_MON
2
8
8
8
8
1
VN
VN
22u-25V
3
+
8
-
22u-25V
C33 22u-25V
VP
C30
_N_STEP
C31
4
4
4
4
4
B1_P
+15V
C62 22u-25V
VP
1 2
C107 22u-25V
8
C111 22u-25V
7
VN
B1_N
B2_P
12
11
B2_N
B3_P
10
9
B3_N
B4_P
14
13
B4_N
VP
8
8
8
8
8
8
C6
1 2
22u-25V
6
1
2
3
DRAIN SOURCE
4
22u-25V
S
2
D
4
4
4
4
4
4
CONTROL 1 2
C
VN
C7
7
6
4
8
A_POT_TOP A_REREF
+POL+
J501:1 10K-DET-THRU-PCB J501:2 J501:3
A_POST_POT_N
J501:4
R509
-POL-
+POL+
U501:2 TL072
A_POST_POT_P
J501:5
SIG_GND
J501:6
A_STANDBY_LED
J501:7 TL072 U501:1 J501:8
SIG_GND A_VP
J501:9
A_VN
J501:10
A_+15V
J501:11
A_V_MON
J501:12
A_PROTECT
J501:13
PWR_GND
J501:14
A_CLIP_FEED
J501:15
A_CLIP
J501:16
PWR_GND
B_POT_TOP B_REREF
+POL+
J601:1 10K-DET-THRU-PCB J601:2 J601:3
B_POST_POT_N
J601:4
R609
-POL-
+POL+
U601:2 TL072
B_POST_POT_P
J601:5
SIG_GND
J601:6
B_STANDBY_LED
J601:7 TL072 U601:1 J601:8
SIG_GND B_VP
J601:9
B_VN
J601:10
B_+15V
J601:11
B_V_MON
J601:12
B_PROTECT
J601:13
PWR_GND
J601:14
B_CLIP_FEED
J601:15
B_CLIP
J601:16
PWR_GND
TL072 220p C300 U300:1
TL072 220p C302 E3 U300:2 E2
TL072 220p C400 U400:2
TL072 220p C402 U400:1
SW1:4
SW1:1
SW1:3
SW1:2
C1 220p
_VTOP B1_P
B2_P
D
D
D
14 13
CA3054M96 U26:1
1 2 3 4 5
G S 7 6 8 9 11 12
G S S
G 8 9 11 12 7 6 S
D G
CA3054M96 U24:1
1 2 3 4
14 13
CA3054M96 U26:3
U24:3 CA3054M96
CA3054M96 U26:2
CA3054M96 U24:2
5
B2_N
B1_N
1
IX2
_SPK_GND
This connects to chassis gnd at rear panel.
1 2
_SPK
IX1
_BGND DR1
DR2
_BOP
B3_P
2
B3_P
D
D
D
14 13
CA3054M96 U28:1
1 2 3 4 5
G S 7 6 8 9 11 12
G S S
G 8 9 11 12 7 6 S
D
G
CA3054M96 U25:1
1 2 3 4
14 13
CA3054M96 U28:3
_VBOT
IX3
U25:3 CA3054M96
CA3054M96 U28:2
CA3054M96 U25:2
5
IX4
DR3
DR4
PM_REF
Supplies: B1 = 30v at 100mA B2 = 20v at 50mA B3 = 40v at 60mA B4 = 27v at 50mA
Puppetmaster voltages: 18.6 volts of zener in series with 56 ohms. Stackup: 11 2.4 1.2 18.6 = 33.2 volts of zener drop 40 volts available.
QTY
ITEM NO.
PART NO.
DESCRIPTION
VENDOR
DR1
DR3
DR2
DR4
IX1
IX3
IX2
_BGND
_VBOT
_VBOT
_VTOP
_VTOP
_BOP
_BGND
PM_REF
C129 22u-25V
_BOP
_BGND
14 13
U21:1
1 2 3
8 9 11 12
U21:2
7 6
22u-25V
C125
4
CA3054M96 U21:3
5
CA3054M96
CA3054M96
CW
W
CCW
DN_DRV _VBOT
UP_DRV
C126 22u-25V
HOT
B3_N
_BOP
IX4
I_MON
DIFF_AMP_BIAS
Gain = 1/37.5
650mV pk excursion
_V200 P_ISENSE MUTE
3
+ 1 5 + 7
_BOP
2
-
5V=187V
N_ISENSE
6
-
_N_STEP
-POLVP
_SPK_GND
Positive = Clip
1 2 3 5 + 3
VN
+ 1
_BOP
+ 7 2 -
Values shown preclip a fixed 5 volts below the rails up to 15 amps of output current. After that, preclip advances 120 mV per ampere output, for 12v preclip at 70 amps.
6 7 5 +
6
-
+POL+
-POL-
2
1 10 12 16
+
14 15
3
+
-
13
With values shown, the effective step switch time delay is 4us flat out to 50 KHz.
CLAMP_SIG
9
VP
0.84 atten. 5.95Vpk clips amp.
CLIP
Closed loop gain =37.5 or 31.5 dB 5.0 Vp=187.5 Vp
VN
_SPK
3
+ 1
2
-
VP PRE_LIM
-POL5 +
-POL+15V_
10 Vpk clips the amp with NO LOAD.
8
Gain = 1.67
7 6 4 -
-POL11 + 3 2 1 6 4
CLIP_FEED
LOSS_OF_FEEDBACK
7
-15V_
5
8
VN
REREF VP
VP
DN_DRV
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.
VN
VP
GAIN_RETARD
UP_DRV
8
SHED_V
7
SHED_V
6
PWR_GND
5
+15V
PSENABLE_A
4
PSENABLE_A
STANDBY
1
I_SET
3
I_SET
MSP_VMON
2
MSP_VMON
2
PWR_GND
D_GND
3
PSENABLE_K
1
PSENABLE_K
MSP_IMON
4
MSP_IMON
MODE_FLAG
5
280 KHz LPF
CLIP_
6
SIG_GND
7
-POL-
2
1
3
CH_IN_N
+
+POL+
C88 47-10NP-10%
8
+POL+
9
CH_IN_P
+POL+
1
J6:1
POT_TOP
REREF
10
-POL-POL3
2
J6:2
REREF
POST_POT_N
11
J6:3
POST_POT_N
POST_POT_P
12
4
J6:4
POST_POT_P
PRE_LIM
13
5
J6:5
SIG_GND
+15V_
14
B1_P
STANDBY_LED
6
J6:6
STANDBY_LED
SMPS_V
15
SMPS_ON
7
J6:7
SIG_GND
-15V_
16
B1_N PRE_LIM
VP
8
J6:8
VP
C63 22u-25V
C68 22u-25V
REREF
VN
9
J6:9
VN
+15V
10
J6:10
+15V
PROTECT V_MON
11
J6:11
V_MON
LOSS_OF_FEEDBACK
CLIP
12
J6:12
PROTECT
13
J6:13
PWR_GND
CLIP_FEED
14
J6:14
CLIP_FEED
15
J6:15
CLIP
16
J6:16
PWR_GND
VP
Current gain: 22,460. 3.6 mA total set curent results in 81A peak output. Minumum at full cut-back is 250 uA or 5.6A output.
PROTECT
VP DIFF_AMP_BIAS
SMPS_ON
MUTE
STANDBY_LED
G
I_SET
D
PSENABLE_A
S
_BOP
C117 22u-25V
Nominal I_SET = 3ma to 5ma. Amp is fully on at I_SET>1ma. Above 3ma fan is unaccellerated. From 3ma to 1ma speed rises. Below 1ma fan speed reduces back linearily to normal speed.
PSENABLE_K
VN
_BGND _V50
1 2
600ms delay to enable audio. 200ms delay to disable audio.
VN
_BOP
3
22u-25V
4
FAN_N
GAIN_RETARD
C55
7
6
186V = 5V
+
5
Gain = 1/37.5
_SPK_GND
Fan idles at 10V up to 60C. From 60C to 80C fan ramps from 10V to 24V. At 85C fan V = 28V MAX. (Note that SMPS can also speed fan up.)
V_MON
+ 7 -
5
2 3
1
VP
6
-POL-
MSP_VMON
B3_N
_N_STEP
SNAPPER PTC
+ 7 -
5
P_ISENSE
6
5V = 100 deg C.
7 + + 3
VN
6 1 5
-
2
Total Gain = 16.85dB
+
3
N_ISENSE
1
HOT=250uA @ 80 deg C.
VP
-
2
70A = 5V >5V = Current Limiting.
I_MON
HOT MSP_IMON
U1 2.5V-1%
The "HOT" threshold is 80C Cutback begins at 100C and full shutdown happens at 110C. (+/- 3 degrees)
Clamps caps to 48-54V
_V200
_V150
G 5 + 7 6 5
_V150
_N_STEP
+ 7
NOTE: This opamp must not clamp its input terminals together. TL072 or EQIV!!!
5 + 7 6
CLAMP_SIG VN
6
-
-
3
VN
+ 1
2
-
V_MON
D
S D G G S
_V100 _V100
LOSS_OF_FEEDBACK
5
+ 7 3 + 1 2 -
6
-
_N_STEP
VN VN
VN
PROTECT
G S
_V50 _V50
3
+ 1 5 + 7 6 -
2
-
_N_STEP
VN
VN
D
B4_P
+
SHED_V
3
22u-25V
-
3 volts here signifies 50 amps output, so load is likely 2 ohms.
B4_N
C19
C48
2
22u-25V
C49 22u-25V
1
S
D
_VTOP
VN _VBOT
I_MON
2
8
8
8
8
1
VN
VN
22u-25V
3
+
8
-
22u-25V
C33 22u-25V
VP
C30
_N_STEP
C31
4
4
4
4
4
B1_P +15V
C62 22u-25V
VP
1 2
C107 22u-25V
8
C111 22u-25V
7
VN
B1_N
B2_P
12
11
B2_N
B3_P
10
9
B3_N
B4_P
14
13
B4_N
VP
8
8
8
8
8
8
C6
1 2
22u-25V
6
1
DRAIN SOURCE CONTROL 1 2
4
22u-25V
S 4 4 4 4 4 4 C
2
D
VN
C7
4
8