Denon DN-V1700 Service Manual page 24

MAX1715EEI (IC303)
MAX1715EEI Terminal Function
Pin
Pin Name
No.
Output Voltage Connection for the OUT1 PWM. Connect directly to the junction of the external inductor and output filter
1 OUT1 capacitors. OUT1 senses the output voltage to determine the on-time and also serves as the feedback input in fixed-
output modes.
Feedback Input for OUT1. Connect to AGND for 1.8V fixed output or to V
2 FB1
resistor-divider from OUT1 for an adjustable output.
Current-Limit Threshold Adjustment for OUT1. The LX1-PGND current-limit threshold defaults to +100mV if ILIM1 is
connected to V
3 ILIM1
R sets the threshold from 50mV to 200mV. The voltage on the pin is 10 times the current-limit voltage. Choose R
EXT
equal to 2kΩ per mV of current-limit threshold (100kΩ to 400kΩ).
4 V+ Battery Voltage Sense Connection. Connect to the input power source. V+ is used only to set the PWM one-shot timing.
On-Time Selection Control Input. This is a four-level input used to determine DH_ on-time. The TON table below is for
VIN = 24V, V
TON
5 TON AGND
REF
Open
Vcc
Pulse-Skipping Control Input. Connect to VCC for low-noise forced-PWM mode. Connect to AGND to enable pulse-
6 SKIP
skipping operation.
Power-Good Open-Drain Output. PGOOD is low when either FB_ input is more than 5.5% below the normal regulation
7 PGOOD
point (typ).
8 AGND Analog Ground
+2.0V Reference Voltage Connection. Bypass to AGND with 0.22µF (min) capacitor. Can supply 50µA for external
9 REF
loads.
10 ON1 OUT1 ON/OFF Control Input. Drive to AGND to turn OUT1 off. Drive to VCC to turn OUT1 on.
11 ON2 OUT2 ON/OFF Control Input. Drive to AGND to turn OUT2 off. Drive to VCC to turn OUT2 on.
Current-Limit Threshold Adjustment for OUT2. The LX2-PGND current-limit threshold defaults to +100mV if ILIM2 is
connected to VCC. Or, connect an external resistor to AGND to adjust the limit. A precision 5µA pull-up current through
12 ILIM2
R sets the threshold from 50mV to 200mV. The voltage on the pin is 10 times the current-limit voltage. Choose R
EXT
equal to 2kΩ per mV of current-limit threshold (100kΩ to 400kΩ).
Feedback Input for OUT2. Connect to AGND for 2.5V fixed output, or connect to a resistor-divider from OUT2 for an
13 FB2
adjustable output.
Output Voltage Connection for the OUT2 PWM. Connect directly to the junction of the external inductor and output filter
14 OUT2 capacitors. OUT2 senses the output voltage to determine the on-time and also serves as the feedback input in fixed-
output mode.
No Connection. These pins are not connected to any internal circuitry. Connect the N.C. pins to the ground plane to
15, 23, 28 N.C.
enhance thermal conductivity.
TOP VIEW
OUT1 1
FB1 2
ILIM1 3
V+ 4
TON 5
SKIP 6
PGOOD 7
AGND 8
REF 9
ON1 10
ON2 11
ILIM2 12
FB2 13
OUT2 14
. Or, connect an external resistor to AGND to adjust the limit. A precision 5µA pull-up current through
CC
= 1.8V, V = 2.5V condition.
OUT1 OUT2
Frequency (OUT1) (kHz)
620
485
345
235
28 N.C.
27 LX1
26 DH1
25 BST1
24 DL1
23 N.C.
22 PGND
21 V
CC
20 V
DD
19 DL2
18 BST2
17 DH2
16 LX2
15 N.C.
Function
for 3.3V fixed output, or connect to a
CC
Frequency (OUT2) (kHz)
460
355
255
170
DN-V1700
EXT
EXT
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