DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
_____________________________Typical Operating Characteristics (continued)
(Circuits of Figures 1 and 2, VCC = VDD = VIN = +5V, L1 = 22µH, SHDN = VCC, CREF = 0.1µF, TA = +25°C, unless otherwise noted.)
LINE-TRANSIENT RESPONSE
(ISET = VCC)
MAX686 TOC10
VCC = VDD =VIN
5V
LINE-TRANSIENT RESPONSE
(ISET = GND)
MAX686 TOC10A
5V
3V
3V
VOUT
50mV/div
AC-COUPLED
5ms/div
LOAD-TRANSIENT RESPONSE
(ISET = GND)
MAX686 TOC11
VOUT = 24V
5mA
IOUT
100µA
VOUT
50mV/div
AC-COUPLED
VOUT = 24V
ILOAD = 5mA
VCC = VDD = VIN
5ms/div
LOAD-TRANSIENT RESPONSE
(ISET = VCC)
MAX686 TOC12
VOUT = 24V
5mA
IOUT
100µA
VOUT
20mV/div
AC-COUPLED
VOUT
50mV/div
AC-COUPLED
2ms/div
2ms/div
SHDN
2V/div
POWER-UP RESPONSE
(POSITIVE CONFIGURATION)
MAX686 TOC13A
SHDN
2V/div
POWER-DOWN RESPONSE
(POSITIVE CONFIGURATION)
MAX686 TOC13B
ISET = VCC
RL = 4.7kΩ
VOUT
5V/div
18.7V
500µs/div
ISET = VCC
5V
RL = 4.7kΩ
VOUT
5V/div
5ms/div
18.7V
5V
6 _______________________________________________________________________________________