mc34063a-s08-t Unisonic Technologies, mc34063a-s08-t Datasheet - Page 8

• Manufacturer Part Number: mc34063a-s08-t
• Description: Variable Frequency Dc-dc Converter Controller Ic For Step-up Or Step-down Voltage Converter
• Manufacturer: Unisonic Technologies

MC34063A
V
IN
R
SC
EXTERNAL CURRENT BOOST CONNECTIONS FOR IC PEAK GREATER THAN 1.5A
V
IN
R
NOTE: 4.
SC
8
7
6
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2a. External NPN Switch
8
7
6
If the output switch is driven into hard saturation (non-Dartington configuration) at low switch currents (= 300mA) and
high driver currents (= 30mA), it may take up to 2.0μs to come out of saturation. This condition will shorten the off
time at frequencies = 30kHz, and is magnified at high temperatures. This condition does not occur with a Darlington
configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output
drive condition is recommended.
1a. External NPN Switch
1
2
1
2
V
OUT
V
OUT
V
V
IN
IN
R
R
SC
SC
8
7
6
8
7
6
1b. External NPN Saturated Switch
2b. External PNP Saturated Switch
LINEAR INTEGRATED CIRCUIT
(See Note 4)
1
2
1
2
R
R
constant V
0 for
QW-R103-008,G
IN
V
OUT
8 of 10
V
OUT