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| HA16116FP Datasheet, PDF (18/34 Pages) Hitachi Semiconductor – Switching Regulator for Chopper Type DC/DC Converter | |||
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HA16116FP/FPJ, HA16121FP/FPJ
Triangle wave VCT
Dead band VDB
Error output VE/O
PWM pulse output
(In case of HA16120)
Power MOS FET
drain current (ID)
(dotted line shows
inductor current)
Current limiter VIN
pin (CL)
VIN â 0.2 V
Example of step-up circuit
VIN
CF
RF
RCS
IC CL
OUT
Inductor
L
ID
VOUT
VTH (CL)
F.B.
Determined by L and VIN
Determined by RCS and RF
Figure 6.6
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 2VBE. This feature is used to conserve the power in the power supply system. In off state the IC
current consumption (IOFF) is 10 µA (Max) for HA16116 and 150 µA (Max) for HA16121.
The ON/OFF pin can also be used to drive logic ICs such as TTL or CMOS with a sink current of 50 µA
(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.
VIN
I IN
External logic IC
RA
P.VIN S.VIN
Off On RB
TIM
To output
stage
To latch
Q1
50 kâ¦
Switch
+
ON/OFF
4 VBE
Q2
â CON/OFF
Q3
GND
To other circuitry
Vref
generation
circuit
Q4
Vref
output
HA16116,
HA16121
On/off hysteresis circuit
Figure 7.1 IC Shutoff by the ON/OFF Pin
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