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參數(shù)資料
| 型號： | FA3687V |
| 廠商： | FUJI ELECTRIC CO LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 1.10 MM HEIGHT, TSSOP-16 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 378K |
| 代理商： | FA3687V |
FA3687V
14
7. Timer latch short-circuit protection circuit
This IC has the timer latch short-circuit protection circuit. This
circuit cuts off the output of all channels when the output
voltage of DC-to-DC converter drops due to short circuit or
overload. To set delay time for timer latch operation, a capacitor
CCP should be connected to the CP pin (Fig. 7). When one of
the output voltage of the DC-to-DC converter drops due to short
circuit or overload, the FB1 pin voltage increases up to around
the VREG voltage for ch1, or the FB2 pin voltage drops down to
around 0V for ch2. When FB1 pin voltage exceeds 2.0V (max.)
or FB2 pin voltage falls below 0.2V (min.), constant-current
source (2A typ.) starts charging the capacitor CCP connected
to the CP pin. If the voltage of the CP pin exceeds 2.1 V (max.),
the circuit regards the case as abnormal. Then the IC is set to
off latch mode and the output of all channels is shut off (Fig. 8),
and the current consumption becomes 2mA (typ.). The period
(tp) between the occurrence of short-circuit in the converter
output and setting to off latched mode can be calculated by the
following equation:
You can reset off latched mode of the short-circuit protection by
either of the following ways about 1) CP pin, or 2) VCC pin, or
3) CS1or CS2 pin:
1) CP voltage = 0V
2) VCC voltage UVLO voltage (2.2V typ.) or below
3) Set the CS pin of the cause of off latched mode as follows
CS1 pin voltage = 0V, CS2 pin voltage = VREG
If the timer-latched mode is not necessary, connect the CP pin
to GND.
8. Output circuit
The IC contains a push-pull output stage and can directly drive
MOSFETs. The maximum peak current of the output stage is
sink current of +150mA, and source current of –400mA. The IC
can also drive NPN and PNP transistors. The maximum current
in such cases is ±50mA. You must design the output current
considering the rating of power dissipation. (See “Design
advice’)
You can switch the types of external discrete MOSFETs by
wiring of the SEL pins (Pin 2, Pin 16). For driving Nch MOS,
connect the SEL pins to GND. For driving Pch MOS, connect
the SEL pins to VREG. You can design buck converter or
inverting converter by driving Pch MOS, and boost converter by
driving Nch MOS.
Connect them either to GND or to VREG surely.
9. Undervoltage lockout circuit
The IC contains a undervoltage lockout circuit to protect the
circuit from the damage caused by malfunctions when the
supply voltage drops. When the supply voltage rises from 0V,
the IC starts to operate at VCC of 2.2V (typ.) and outputs
generate pulses. If a drop of the supply voltage occurs, it stops
output at VCC of 2.1V (typ.). When it occurs, the CS1 pin is
turned to low level and the CS2 pin to high level, and then these
pins are reset.
Fig. 7
Fig. 8
VTHCPTL: CP pin latched mode threshold voltage [V]
ICP:
CP charge source current [A]
CCP:
Capacitance of CP pin capacitor
1
CP
CCP
Icp
Vcp
CP
pin
voltage
[V]
1.0
2.0
Time t
Start-up
Momentary short
circuit
Short circuit
protection
tp
2.1V (max)
VREG pin voltag
tp [s] = CCP
VTHCPTL
ICP
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