Max8730 low-cost battery charger, Typical operating characteristics (continued) – Rainbow Electronics MAX8730 User Manual
Page 11
MAX8730
Low-Cost Battery Charger
______________________________________________________________________________________
11
OUTPUT RIPPLE VOLTAGE
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
OUTPUT RIPPLE VOLTAGE (mV
P-P
)
MAX8730 toc10
0
5
10
15
20
0
0.03
0.06
0.09
0.12
0.15
0.18
Typical Operating Characteristics (continued)
(Circuit of Figure 1, adapter = 19.5V, V
BATT
= 12V, V
ICTL
= 2.4V, MODE > 1.8V, REFON = INPON = LDO, V
RELTH
= V
REF
/2, T
A
=
+25°C, unless otherwise noted.)
SWITCHING FREQUENCY
vs. BATTERY VOLTAGE
BATTERY VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
MAX8730 toc11
0
3
6
9
12
15
18
200
400
600
800
1000
BATTERY REMOVAL
MAX8730toc12
13V
12.5V
C
OUT
= 4.7
µF
C
OUT
= 10
µF
4
µs/div
CHARGE
CURRENT = 12V
ADAPTER INSERTION
MAX8730toc13
0V
20V
20V
0V
20V
0V
20V
0V
100
µs/div
ADAPTER
PDS
PDL
SYSTEM
LOAD
ADAPTER
INSERTION
ADAPTER REMOVAL
MAX8730toc14
0V
20V
20V
0V
20V
0V
20V
0V
4ms/div
ADAPTER
PDS
PDL
SYSTEM
LOAD
BATTERY
VOLTAGE = 16.8V
SYSTEM LOAD TRANSIENT
MAX8730toc15
0A
5A
5A
0A
5A
0A
500mV/div
200
µs/div
LOAD
CURRENT
ADAPTER
CURRENT
INDUCTOR
CURRENT
COMPENSATION
CCS
CCI
CCS
CCI