16114FP Renesas, 16114FP Datasheet - Page 18

• Manufacturer Part Number: 16114FP
• Description: Search -----> HA16114FP
• Manufacturer: Renesas

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HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
7. Timing of Intermittent Mode during Overcurrent
7.1 Principle of Operation
These ICs provide pulse-by-pulse overcurrent protection by sensing the current during each pulse and
shutting off the pulse if overcurrent is detected. In addition, the TM and ON/OFF pins can be used to
operate the IC in intermittent mode if the overcurrent state continues. A power supply with sharp settling
characteristics can be designed in this way.
Intermittent mode operates by making use of the hysteresis of the ON/OFF pin threshold voltages V
V
When not using intermittent mode, leave the TM pin open, and pull the ON/OFF pin up to V
The V
Rev.1, Dec. 2000, page 16 of 38
OFF
(V
BE
ON
is base emitter voltage of internal transistors.
– V
Vref
OFF
3
2
1
0
R
R
0
C
D
= V
V
0.7 V
OFF
BE
). The timing can be programmed as explained below.
1
ON/
(open)
390 kΩ
2.2 kΩ
2.2 µF
V
1.4 V
OFF
ON
2
V
TM
ON/
Figure 7.1 Connection Diagram (example)
Figure 6.2 Adjustment of UVL Voltages
+
−
OFF
3
2.5 V
10 kΩ
R
R
GND
C
3V
V
A
B
IN
ON/
ON/OFF
BE
OFF
V
4
IN
TM
To latch
≥
4.5 V
5
Q
V
2
IN
reference
Vref
Q
I
IN
1
Q
generation
3
On/off hysteresis circuit
Latch
Q
circuit
Vref
S
R
Current
limiter
To other circuitry
CL
Vref output
V
ON
IN
or higher.
ON
and
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