MAX1566-MAX1567 Datasheet, PDF (22/35 Pages) Maxim Integrated Products – Six-Channel, High-Efficiency, Digital Camera Power Supplies

Six-Channel, High-Efficiency, Digital
Camera Power Supplies
V_SU
R_OSC
OSC
C_OSC
V_REF
(1.25V)
200ns
ONE-SHOT
MAX1566
MAX1567
Figure 6. Oscillator Functional Diagram
MAX1566
TO
MAX1567
V_BATT
(PARTIAL)
AUX
PWM
PVSU
DL_
Q1
D6
+15V
50mA
LCD
FB_
NOTE: THIS CIRCUIT CAN OPERATE WITH AUX1, AUX2,
OR AUX3 ON THE MAX1566, AND WITH AUX1 OR AUX3 ON
THE MAX1567. TO USE AUX3, FB3L = GND, AND
FB3H IS USED FOR FEEDBACK.
Figure 8. +15V LCD Bias with Basic Boost Topology
TO
V_BATT
R1
D2–D5
R2
LEDS
MAX1566
MAX1567
(PARTIAL)
PVSU
DL3
FB3H
(1.25V)
FB3L
(0.2V)
AUX3
PWM
R3
NOTE: IF OPEN LED PROTECTION IS NOT
REQUIRED, REMOVE R2 AND R1 AND GROUND FB3H.
Figure 7. LED drive with open LED overvoltage protection is
provided by the additional feedback input to AUX3, FB3H.
TO
V_BATT
MAX1566
MAX1567
(PARTIAL)
AUX
PWM
PVSU
Q1
D2
DL_
FB_
+15V
50mA
CCD+
-7.5V
30mA
CCD-
NOTE: THIS CIRCUIT CAN OPERATE WITH AUX1, AUX2,
OR AUX3 ON THE MAX1566, AND WITH AUX1 OR AUX3 ON
THE MAX1567. TO USE AUX3, FB3L = GND, AND
FB3H IS USED FOR FEEDBACK.
Figure 9. +15V and -7.5V CCD Bias with Transformer
Master-Slave Configurations
The MAX1566/MAX1567 support MAX1801 slave PWM
controllers that obtain input power, a voltage reference,
and an oscillator signal directly from the MAX1566/
MAX1567 master. The master-slave configuration allows
channels to be easily added and minimizes system cost
by eliminating redundant circuitry. The slaves also con-
trol the harmonic content of noise because their operat-
ing frequency is synchronized to that of the MAX1566/
MAX1567 master converter. A MAX1801 connection to
the MAX1566/MAX1567 is shown in Figure 14.
Status Outputs (SDOK, AUX1OK, SCF)
The MAX1566/MAX1567 include three versatile status
outputs that can provide information to the system. All
are open-drain outputs and can directly drive MOSFET
switches to facilitate sequencing, disconnect loads
during overloads, or perform other hardware-based
functions.
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