MAX1856 Maxim, MAX1856 Datasheet - Page 7

• Manufacturer Part Number: MAX1856
• Description: Wide Input Range / Synchronizable / PWM SLIC Power Supply
• Manufacturer: Maxim

-47.72V
-47.76V
-47.80V
-20V
-40V
-60V
5V
2A
2A
0
0
0
0
A. V
B. I
CIRCUIT OF FIGURE 4
A. V
B. I
C. V
CIRCUIT OF FIGURE 4
(Circuit of Figure 1, V
LIGHT-LOAD SWITCHING WAVEFORM
LP
LP
SYNC
OUT
OUT
, 2A/div
, 2A/div
= -48V, R
/
= -48V, I
SHDN
EXITING SHUTDOWN
= 0 TO 5V, 5V/div
OUT
OUT
4ms/div
4µs/div
= 20mA, 20mV/div
= 2.4kΩ, 20V/div
_______________________________________________________________________________________
CC
= V
MAX1856 toc21
MAX1856 toc24
SYNC/SHDN
A
B
C
A
B
Wide Input Range, Synchronizable,
= 12V, V
200mA
-47.1V
-47.6V
-48.1V
-100
-20
-40
-60
-80
5V
5V
2A
60
40
20
0
0
0
0
0
A. V
B. V
C. I
V
CIRCUIT OF FIGURE 4
A. I
B. V
C. I
CIRCUIT OF FIGURE 4
0
OUT1
RINGER TO TALK-BATTERY CROSSTALK
Typical Operating Characteristics (continued)
OUT
LP
OUT
LP
SYNC
EXT
OUT
, 2A/div
= -48V, R
, 2A/div
, 5V/div
, = -48V, 500mV/div
= 20mA TO 200mA, 200mA/div
= -24V, V
/
50
SHDN
ENTERING SHUTDOWN
LOAD TRANSIENT
OUT
= 5V TO 0, 5V/div
FREQUENCY (Hz)
RINGER OUTPUT
100
= 240Ω
10µs/div
1ms/div
OUT2
TALK-BATTERY OUTPUT
PWM SLIC Power Supply
150
= -72V, R
200
MAX1856 toc22
MAX1856 toc25
OSC
250
A
B
C
B
C
A
= 200kΩ, unless otherwise noted.)
-47.0V
-47.1V
-47.2V
-47V
14V
12V
10V
4A
2A
0
A. V
B. I
CIRCUIT OF FIGURE 4
A. V
B. V
CIRCUIT OF FIGURE 4
HEAVY-LOAD SWITCHING WAVEFORM
LP
OUT
IN
OUT
, 2A/div
= 10V TO 14V, 2Vdiv
= -48V, I
= -48V, I
LINE TRANSIENT
OUT
OUT
2.0µs/div
= 200mA, 50mV/div
= 200mA, 100mV/div
400µs/div
MAX1856 toc23
MAX1856 toc26
7
A
B
A
B