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参数资料
| 型号： | APW6020K-TR |
| 厂商： | Anpec Electronics Corporation |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Advanced Dual PWM and Dual Linear Power Controllers |
| 中文描述： | 先进的双PWM和双线性功率控制器 |
| 文件页数： | 5/13页 |
| 文件大小： | 128K |
| 代理商： | APW6020K-TR |
Copyright
ANPEC Electronics Corp.
Rev. A.2 - May, 2001
APW 6020
www.anpec.com.tw
5
Functional Pin Description
UGATE2 (Pin 1)
Connect UGATE2 pin to the standard BUCK PWM
converter’s MOSFET gate. This pin provides the gate
drive for the MOSFET.
PHASE2 (Pin 2)
Connect the PHASE2 pin to the standard BUCK PWM
converter’s MOSFET source. This pin is used to
monitor the voltage drop across the MOSFET for
over-current protection.
VID0 , VID1 , VID2 , VID3 , VID4 (Pins 7, 6 , 5 , 4 and
3)
VID0-4 are the TTL-compatible input pins to the 5-bit
DAC. The logic states of these five pins program the
internal voltage reference (DACOUT). The level of
DACOUT sets the microprocessor core converter
output voltage , as well as the coresponding PGOOD
and OVP thresholds.
PGOOD (Pin 8)
PGOOD is an open drain output used to indicate the
status of the output voltages. This pin is pulled low
when the synchronous regulator output is not within
10% of the DACOUT reference voltage or when any
of the other outputs are below their under-voltage
thresholds.
The PGOOD output is open for ‘11111’ VID code.
OCSET2 (Pin 9)
Connect a resistor (R
) from this pin to the drain
of the standard BUCK converter’s MOSFET. R
,
an internal 200
μ
A current source (I
) , and the
MOSFET’s on-resistance(r
) set the converter
over-current (OC) trip point according to the follow-
ing equation :
I
PEAK
=
An over-current trip cycles the soft-start function.
VSEN2 (Pin 10)
Connect this pin to the output of the standard Buck
PWM converter. The voltage at this pin is regulated
to the level predetermined by the logic-level status of
the SELECT pin. This pin is also monitored by the
PGOOD comparator circuit.
SELECT (Pin 11)
This pin determines the output voltage of the AGP
bus switching regulator. A low TTL input sets the
output voltage to 1.5V , while a high input sets the
output voltage to 3.3V.
SS (Pin 12)
Connect a capacitor from this pin to ground. This
capacitor , along with an internal 28
μ
A current source
, sets the soft-start interval of the converter.
FAULT / RT (Pin 13)
This pin provides oscillator switching frequency
adjustment. By placing a resistor (R
) from this pin
to GND , the nominal 200kHz switching frequency is
increased. Conversely , connecting a pull-up resis-
tor (R
) from this pin to VCC reduces the switching
frequency.
Nominally , the voltage at this pin is 1.26V. In the
event of an over-voltage or over-current condition ,
this pin is internally pulled to VCC.
VSEN4 (Pin 14)
Connect this pin to the output of the linear 1.8V
regulator. This pin is monitored for under-voltage
events.
DRIVE4 (Pin 15)
Connect this pin to the gate of an external MOSFET.
This pin provides the drive for the 1.8V regulator’s
pass transistor.
VAUX (Pin 16)
The +3.3V input voltage at this pin is monitored for
I
OCSET
* R
OCSET
r
DS(ON)
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