HA16116 Hitachi Semiconductor, HA16116 Datasheet - Page 18

• Manufacturer Part Number: HA16116
• Description: Switching Regulator for Chopper Type DC/DC Converter
• Manufacturer: Hitachi Semiconductor

HA16116FP/FPJ, HA16121FP/FPJ
7. ON/OFF Pin Usage
7.1 IC Shutoff by the ON/OFF Pin
As shown in the figure 7.1, these ICs can be turned off safely by lowering the voltage at the ON/OFF pin to
below 2V
current consumption (I
The ON/OFF pin can also be used to drive logic ICs such as TTL or CMOS with a sink current of 50 A
(Typ) at an applied voltage of 5 V. When it is desired to employ this feature along with intermittent
operation, an open collector or open drain logic IC should be used.
18
External logic IC
PWM pulse output
PWM pulse output
(In case of HA16120)
(In case of HA16120)
Power MOS FET
Power MOS FET
drain current (I
drain current (I
(dotted line shows
(dotted line shows
Current limiter
Current limiter
pin (CL)
pin (CL)
inductor current)
inductor current)
Dead band V
Dead band V
Triangle wave V
Triangle wave V
Error output V
Error output V
BE
. This feature is used to conserve the power in the power supply system. In off state the IC
V
V
IN
IN
0.2 V
0.2 V
DB
DB
D
D
)
)
V
V
E/O
E/O
OFF
IN
IN
CT
CT
) is 10 A (Max) for HA16116 and 150 A (Max) for HA16121.
Off
Switch
Figure 7.1 IC Shutoff by the ON/OFF Pin
On
+
C
R
R
ON/OFF
A
B
P.V
TIM
ON/OFF
Figure 6.6
IN
GND
V
V
S.V
50 k
TH
TH
4 V
To output
stage
To latch
(CL)
(CL)
IN
BE
IC
IC
HA16116,
HA16121
Example of step-up circuit
Example of step-up circuit
I
IN
V
V
C
C
OUT
OUT
IN
IN
Determined by L and V
Determined by L and V
Determined by R
Determined by R
L
L
C
C
F
F
Q
R
R
Q
Q
F
F
1
2
3
F.B.
F.B.
V
R
R
I
I
generation
IN
Inductor
Inductor
L
L
CS
CS
D
D
Q
On/off hysteresis circuit
circuit
4
Vref
CS
CS
To other circuitry
and R
and R
IN
IN
F
F
Vref
output
V
V
OUT
OUT