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參數(shù)資料
| 型號(hào)： | ZXLD1601 |
| 廠商： | Zetex Semiconductor |
| 英文描述： | ADJUSTABLE DC - DC BOOST CONVERTER WITH INTERNAL SWITCH IN SC70 |
| 中文描述： | 可調(diào)式直流-直流升壓轉(zhuǎn)換器內(nèi)部采用SC70開關(guān) |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 134K |
| 代理商： | ZXLD1601 |
APPLICATIONS
Setting output voltage
When connected as shown in the typical application
circuit, the ZXLD1601 will produce a nominal default
output of between 26V and 28V. This is set by the
internal potential divider comprising of resistors R1
and R2. (See device block diagram).
The internal potential divider network R1/R2 is
accessible at the FB pin and can be shunted by means
of external resistors to set different nominal output
voltages. The potential divider defines output voltage
according to the relationship:
R
R
1
V
V
OUT
FB
=
+
1
2
where VFB = 1.025V.
When using external resistors, these should be chosen
with lower values than the internal resistors to
minimize errors caused by the device to device
variation in absolute value of the internal resistors
(
±
30% max). The internal resistors have high values in
order to minimize these errors.
The following table gives suggested values for various
output voltages.
Once the nominal outputvoltage has been set, itcan be
adjusted to a lower value by applying a pulse width
modulated (PWM) control signal to the EN pin, using
one of the two methods described below.
PWM adjustment permits the device to be turned on
and the output voltage set by a single logic signal
applied to the EN pin. No external resistors are
required and the amplitude of the control signal is not
critical, providing it conforms to the limits defined in
the electrical characteristics.
1) PWM output voltage adjustment (analogue mode)
During this mode of operation the device operation is
continuous, providing a low ripple output voltage
(V
) directly proportional to the duty cycle (D) of the
logic signal applied to the EN pin according to the
relationship:
V
OUT
= D x V
OUT(nom)
Square wave signals applied to the EN pin, for
example,willturnthedeviceonandproduceanominal
regulated output of 13.5V.
The ZXLD1601 contains a timing circuit that switches
the device on a few microseconds after the application
of a rising edge to EN and turns it back off again
nominally 120
μ
s after the falling edge of EN. For
continuous PWM mode operation, the frequency ofthe
control signal must therefore be maintained above
10kHz at all times, to prevent the internal delay circuit
from timing out and switching the device into standby
mode. The maximum frequency applied to EN should
be limited to 100kHz to minimize errors due to internal
switching delays
2) PWM output voltage adjustment (gated mode)
This method of adjustment can be used in applications
where the output ripple is less important than the
supply current. The method of adjustment is the same
as in 1) above, however, during this mode ofoperation,
the device is gated on and off, providing an average
output voltage (V
) directly proportional to the duty
cycle (D) of the logic signal applied to the EN pin
according to the relationship:
V
OUT(AVG)
= D x V
OUT(nom)
Therippleonthis voltagewillbedeterminedby thesize
of the output capacitor.
The outputvoltage can be adjusted all the way down to
the inputvoltage by eithermethod ofPWM control, but
for best results, the duty cycle range should be kept
within thespecified range.Lowerduty cycles willresult
in increased output ripple and non-linearity in the
relationshipbetweenduty cycleandoutputvoltage.Ifa
greater control range is required, the nominal output
can be reduced by the use of external resistors before
the PWM signal is applied.
Minimizing output voltage ripple
Forapplications requiring loweroutputrippleitmay be
necessary to add a small ceramic capacitor in parallel
with R2. A value of 4.7pF is suitable for most output
ranges.
ZXLD1601
S E M IC O N D U C T O R S
ISSUE 3 - AUGUST 2004
8
Required
output voltage
External
resistor across
R1
External resistor
across R2
5V
43K
130K
12V
56K
487K
18V
43K
649K
21V
34.8K
649K
25V
27K
620K
28V
40.2K
1.07M
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|---|---|
| ZXLD1601H6 | 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER SMD |
| ZXLD1601H6TA | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Boost Converter for LCD and OLED BIAS RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ZXLD1601H6TC | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Boost Converter for LCD and OLED BIAS RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ZXLD1615 | 制造商:DIODES 制造商全稱:Diodes Incorporated 功能描述:ADJUSTABLE DC-DC BOOST CONVERTER WITH INTERNAL SWITCH IN |
| ZXLD1615ET5 | 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER SMD 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER, SMD 制造商:Diodes Incorporated 功能描述:LCD/OLED BIAS BOOST CONVERTER, SMD; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:28V; Output Current:10mA; Voltage Regulator Case Style:TSOT-23; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature ;RoHS Compliant: Yes |
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