PSR-S750/PSR-S950
38
PIN
NO.
I/O
FUNCTION
NAME
PIN
NO.
I/O
FUNCTION
NAME
BD6590MUV-E2
(YD867A00)
DC-DC CONVERTER
DM: IC904 (PSR-S950)
O
O
-
-
O
I
I
I
I
I
-
-
LED1
LED2
LED3
LED4
LED5
LED6
N.C.
GND
PWMDRV
VBAT
PWMPOW
VBAT
SW
SW
N.C.
PGND
FAILFLAG
OCPSET
VDET
TEST
RSTB
ISET
GND
N.C.
Switching Tr drive terminal
Switching Tr drive terminal
No connect pin
PGND for switching Tr
Fail Flag
Current Limiter setting
Detect input for SBD open and OVP
TEST signal
Reset
Resister connection for LED current setting
GND for Switching Regulator
No connect pin
Current sink for LED
Current sink for LED
Current sink for LED
Current sink for LED
Current sink for LED
Current sink for LED
No connect pin
GND for Current driver
PWM input pin for power ON/OFF only driver
Regulator output / Internal power-supply
PWM input pin for power ON/OFF
Switching Tr drive terminal
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
I
I
I
I
I
I
-
-
I
I
I
I
PIN
NO.
I/O
FUNCTION
NAME
LT3506AEDHD#TRPBF
(YC714A00)
DC-DC CONVERTER
DM: IC502 (PSR-S750)
I
O
I
I
I
O
O
I
-
BOOST1, BOOST2
SW1, SW2
V
IN1
V
IN2
RUN/SS1, RUN/SS2
PG1, PG2
V
C1
, V
C2
FB1, FB2
Exposed Pad
The BOOST pins are used to provide drive voltages, higher than the input voltage, to the internal
bipolar NPN power switches. Tie through a diode from V
OUT
or from V
IN
.
The SW pins are the outputs of the internal power switches. Connect these pins to the inductors,
catch diodes and boost capacitors.
The V
IN1
pins supply current to the LT3506’s internal regulator and to the internal power switch
connected to SW1. These pins must be locally bypassed.
The V
IN2
pins supply current to the internal power switch connected to SW2 and must be locally
bypassed. Connect these pins directly to V
IN1
unless power for channel 2 is coming from a
different source.
The RUN/SS pins are used to shut down the individual switcing regulators and the internal bias
circuits. They also provide a soft-start function. To shut down either regulator, pull the RUN/SS
pin to ground with an open drain or collector. Tie a capacitor from these pins to ground to limit
switch current during start-up. If neither feature is used, leave these pins unconnected.
The Power Good pins are the open collector outputs of an internal comparator. PG remains low
until the FB pin is within 10% of the final regulation voltage. As well as indicating output
regulation, the PG pins can be used to sequence the two switching regulators. These pins can be
left unconnected. The PG outputs are valid when V
IN
is greater than 3.4V and either of the
RUN/SS pins is high. The PG comparators are disabled in shutdown.
The V
C
pins are the outputs of the internal error amps. The voltages on these pins control the
peak switch currents. These pins are normally used to compensate the control loops, but can
also be used to override the loops. Pull these pins to ground with an open drain to shut down
each switching regulator.
The LT3506 regulaters each feedback pin to 800mV. Connect the feedback resistor divider taps
to these pins.
The Exposed Pad of the package provides both electrical contact to ground and good thermal
contact to the printed circuit board. The Exposed Pad must be soldered to the circuit board for
proper operation.
1, 8
2, 7
3, 4
5, 6
13, 12
14,11
15, 10
16, 9
17
Summary of Contents for PSR-S750
Page 41: ...41 PSR S750 PSR S950 Pattern side 2NA WZ35370 1 DM Circuit Board PSR S750 ...
Page 43: ...43 PSR S750 PSR S950 Pattern side Scale 90 100 DM Circuit Board PSR S950 2NA WZ49340 1 ...
Page 45: ...45 PSR S750 PSR S950 Scale 90 100 Pattern side AJACK Circuit Board 2NA WZ43510 2 ...
Page 47: ...47 PSR S750 PSR S950 PNM Circuit Board Pattern side Scale 70 100 2NA WZ50830 1 ...
Page 48: ...PSR S750 PSR S950 48 PNS Circuit Board Component side WR 315 1 WR 31 1 WR 310 1 2NA WZ50830 1 ...
Page 49: ...49 PSR S750 PSR S950 Pattern side PNS Circuit Board 2NA WZ50830 1 ...
