參數(shù)資料
型號(hào)： HA16114FPJ
廠商： Hitachi,Ltd.
英文描述： ID ISC.ANT.MUX 8X ANT MULTIPLEXR
中文描述： 開關(guān)穩(wěn)壓器的斬波式直流/直流轉(zhuǎn)換器
文件頁(yè)數(shù)： 15/38頁(yè)
文件大小： 275K
代理商： HA16114FPJ
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
15
6. Usage of ON/
OFF
Pin
This pin is used for the following purposes:
To shut down the IC while its input power remains on (power management)
To externally alter the UVL release voltage
With the timer (TM) pin, to operate in intermittent mode during overcurrent (see next section)
6.1 Shutdown by ON/
OFF
Pin Control
The IC can be shut down safely by bringing the voltage at the ON/
OFF
pin below about 0.7 V (the internal
VBE value). This feature can be used in power supply systems to save power. When shut down, the
HA16114 draws a maximum current (I
OFF
) of 10
μ
A, while the HA16120 draws a maximum 150
μ
A. The
ON/
OFF
pin sinks 290
μ
A (Typ) at 5 V, so it can be driven by TTL and other logic ICs. If intermittent
mode will also be employed, use a logic IC with an open-collector or open-drain output.
HA16114,
HA16120
GND
V
IN
I
IN
TM
ON/OFF
V
IN
Vref
output
To other circuitry
Vref
reference
To latch
R
B
R
A
C
ON/OFF
+
Switch
10 k
3V
BE
Q
1
Q
3
Off
On
External logic IC
On/off hysteresis circuit
Q
2
Figure 6.1 Shutdown by ON/
OFF
Pin Control
6.2 Adjustment of UVL Voltages (when not using intermittent mode)
These ICs permit external adjustment of the undervoltage lockout voltages. The adjustment is made by
changing the undervoltage lockout thresholds V
TH
and V
TL
relative to V
IN
, using the relationships shown in
the accompanying diagrams.
When the IC is powered up, transistor Q
3
is off, so V
ON
is 2V
BE
, or about 1.4 V. Connection of resistors R
C
and R
D
in the diagram makes undervoltage lockout release at:
V
IN
= 1.4 V
×
R
C
+ R
D
R
D
This V
IN
is the supply voltage at which undervoltage lockout is released. At the release point Vref is still
below 2.5 V. To obtain Vref = 2.5 V, V
IN
must be at least about 4.3 V.
Since V
ON/
OFF
operates in relation to the base-emitter voltage of internal transistors, V
ON
has a temperature
coefficient of approximately –4 mV/°C. Keep this in mind when designing the power supply unit.
When undervoltage lockout and intermittent mode are both used, the intermittent-mode time constant is
shortened, so the constants of external components may have to be altered.
相關(guān)PDF資料
PDF描述
HA16114FP RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
HA16114P RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
HA16120FP RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
HA16114PJ RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
HA16120FPJ CAP 1000PF 25V 5% NP0(C0G) SMD-0603 TR-7 PLATED-NI/SN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA16114P 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Switching Regulator for Chopper Type DC/DC Converter
HA16114P/PJ/FP/FPJ/ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HA16114P/PJ/FP/FPJ/ HA16120FP/FPJ Datasheet 504K/SEP.18.03
HA16114P-E 制造商:Renesas Electronics Corporation 功能描述:Power Sup,SW Reg.Control IC,S-Down,DIP16
HA16114PJ 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Switching Regulator for Chopper Type DC/DC Converter
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