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參數(shù)資料
| 型號(hào)： | UCC3830DAC-5 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 5-Bit Microprocessor Power Supply Controller |
| 中文描述： | 5位微處理器電源控制器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 419K |
| 代理商： | UCC3830DAC-5 |
4
UCC3830-4/-5/-6
CAM (Current Amplifier Inverting Input):
The average
load current feedback from ISOUT is applied through a
resistor to this pin. The current loop compensation
network is also connected to this pin (see CAO/ENBL
below).
CAO/ENBL (Current Amplifier Output/Chip Enable):
The current loop compensation network is connected
between this pin and CAM. The voltage on this pin is the
input to the PWM comparator and regulates the output
voltage of the system.
The GATE output is disabled
(held low) unless the voltage on this pin exceeds 1V,
allowing the PWM to force zero duty cycle when
necessary. The PWM forces maximum duty cycle when
the voltage on CAO/ENBL exceeds the oscillator peak
voltage
(3V).
A
3.2V
clamp
CAO/ENBL voltage from rising excessively past the
oscillator peak voltage for excellent transient response.
The user can force this pin below 0.8V externally with an
open collector, disabling the GATE drive.
circuit
prevents
the
COMMAND
Voltage):
digital-to-analog converter (DAC) and the noninverting
input of the voltage amplifier. The voltage on this pin sets
the switching regulator output voltage. This voltage
ranges from 1.8V to 3.5V as programmed by the 5-bit
DAC according to Table 1. The GATE output is disabled
when all 1s or illegal codes are presented at the 5 Bit
DAC. The COMMAND source impedance is typically
1.2k
and must therefore drive only high impedance
inputs
if
accuracy
is
to
COMMAND with a 0.01
μ
F, low ESR, low ESL capacitor
for best circuit noise immunity.
(Digital-to-Analog
This
pin
Converter
output
Output
the
is
the
of
5-bit
be
maintained.
Bypass
COMP (Voltage Amplifier Output):
The system voltage
compensation network is applied between COMP and
VFB.
D0 - D4 (DAC Digital Input Control Codes):
These are
the DAC digital input control codes, with D0 representing
the least significant bit (LSB) and D4, the most significant
bit (MSB) as shown in Table 1. A bit is set low by being
connected to GND. A bit is set high by floating it, or
connecting it to a 5V source. Each control pin is pulled
up to approximately 5V by an internal 70
μ
A current
source.
GATE (PWM Output, MOSFET Driver):
This output
provides a 4
totem pole driver. Use a series resistor
between this pin and the gate of the external MOSFET to
prevent excessive overshoot.
GND (Signal Ground):
All voltages are measured with
respect to GND. Bypass capacitors on the VCC and
VREF pins should be connected directly to the ground
plane near the GND pin.
IS– (Current Sense Amplifier Inverting Input):
This pin
is the inverting input to the current sense amplifier and is
connected to the low side of the average current sense
resistor.
IS+ (Current Sense Amplifier Noninverting Input):
This pin is the noninverting input to the current sense
amplifier and is connected to the high side of the
average current sense resistor.
ISOUT (Current Sense Amplifier Output):
This pin is
the output of the current sense amplifier. The voltage on
this pin is (COMMAND + G
CSA
I R
SENSE
), where
COMMAND is the voltage on the COMMAND pin, G
CSA
is the fixed gain of the current sense amplifier, equal to
15, I is the current through the sense resistor, and
R
SENSE
is the value of the average current sensing
resistor.
PGND (Power Ground):
This pin provides a dedicated
ground for the output gate driver. The GND and PGND
pins should be connected externally using a short printed
circuit board trace close to the IC. Decouple VIN to
PGND with a low ESR capacitor
0.10
μ
F.
PWRGOOD
Output):
This pin is an open drain output which is driven
low to reset the microprocessor when VSENSE rises
above or falls below its nominal value by 8.5%. The on
resistance of the open drain switch will be no higher than
470
. The OV and UV comparators’ hysteresis is fixed
at 20mV independent of the COMMAND voltage.
(Undervoltage/Lower
Overvoltage
VIN (Positive Supply Voltage):
This pin supplies power
to the chip. Connect VIN to a stable voltage source of at
least 10.8V. The GATE and PWRGOOD outputs will be
held low until VCC exceeds the upper undervoltage
lockout threshold. This pin should be bypassed directly
to the GND pin.
VFB (Voltage Amplifier Inverting Input):
This input is
connected to COMP through a feedback network and to
the power supply output through a resistor or a divider
network.
VREF (Voltage Reference Output):
This pin provides
an accurate 5V reference and is internally short circuit
current limited. VREF powers the D/A converter and also
provides a threshold voltage for the UVLO comparator.
For best reference stability, bypass VREF directly to
GND with a low ESR, low ESL capacitor of at least
0.01
μ
F.
PIN DESCRIPTIONS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UCC3830DAC-6 | 5-Bit Microprocessor Power Supply Controller |
| UCC3830DW-4 | 5-Bit Microprocessor Power Supply Controller |
| UCC3830DWP-4 | 5-Bit Microprocessor Power Supply Controller |
| UCC3830DWP-5 | 5-Bit Microprocessor Power Supply Controller |
| UCC3830DWP-6 | 5-Bit Microprocessor Power Supply Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC3830DAC-6 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-Bit Microprocessor Power Supply Controller |
| UCC3830DW-4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-Bit Microprocessor Power Supply Controller |
| UCC3830DW-5 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-Bit Microprocessor Power Supply Controller |
| UCC3830DW-6 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-Bit Microprocessor Power Supply Controller |
| UCC3830DWP-4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-Bit Microprocessor Power Supply Controller |
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