MC33342 ON Semiconductor, MC33342 Datasheet - Page 12

• Manufacturer Part Number: MC33342
• Description: (MC33340 / MC33342) Battery Fast Charge Controllers
• Manufacturer: ON Semiconductor

The MC33340/342 can be used to control the MC34166 or MC34167 power switching regulators to produce an economical and efficient fast charger. These
devices are capable of operating continuously in current limit with an input voltage range of 7.5 to 40 V. The typical charging current for the MC34166 and
MC34167 is 4.3 A and 6.5 A respectively. Resistors R2 and R1 are used to set the battery pack fast charge float voltage. If precise float voltage control is not
required, components R1, R2, R3 and C1 can be deleted, and Pin 1 must be grounded. The trickle current level is set by resistor R4. It is recommended that
a redundant charge termination method be employed for end user protection. This is especially true for fast charger systems. For additional converter design
information, refer to the MC34166 and MC34167 data sheets.
Gnd
3
OSC
PWM
Thermal
MC34166 or MC34167
Compensation
Figure 15. Switch Mode Fast Charger
S
R
Q
I
Limit
UVLO
5
MC33340, MC33342
EA
C1
Trickle
Ref
Gate
Fast/
http://onsemi.com
V
sen
2
3
R3
12
V
4
Switch
Output
2
Voltage
Feedback
Input
1
CC
MC33340/342
R1
+
R2
Gnd
Battery
Pack
V
Gate
F/T
sen
R4
4
Input
Line
AC