UCC3830-4 [TI]
5-Bit Microprocessor Power Supply Controller; 5位微处理器电源控制器
| 型号： | UCC3830-4 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 5-Bit Microprocessor Power Supply Controller |
| 文件： | 总10页 (文件大小：421K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UCC3830-4/-5/-6
5-Bit Microprocessor Power Supply Controller
FEATURES
DESCRIPTION
• 5-Bit Digital-to-Analog Converter
(DAC)
The UCC3830-4/-5/-6 is a fully integrated single chip solution ideal for power-
ing high performance microprocessors. The chip includes an average current
mode PWM controller, has a fully integrated 5-Bit DAC, and includes an
on-board precision reference and voltage monitor circuitry. The UCC3830-x
converts 5VDC to an adjustable output, ranging from 3.5VDC down to 1.8VDC
with 1% DC system accuracy (see Table 1). The UCC3830-x fully supports
Intel’s 4-bit Pentium® Pro and 5-bit Pentium® II VID codes.
• Supports 4-Bit and 5-Bit
Microprocessor VID Codes
• Combined DAC/Voltage Monitor
and PWM Functions
• 1% DAC/Reference
• Current Sharing
The accuracy of the DAC/reference combination is 1%. The overvoltage and
undervoltage comparators monitor the system output voltage and indicate
when it rises above or falls below its programmed value by more than 8.5%. A
second overvoltage protection comparator pulls the current amplifier output
voltage low to force zero duty cycle when the system output voltage exceeds
its designed value by more than 17.5%. This comparator also terminates the
cycle. Undervoltage lockout circuitry assures the correct logic states at the
outputs during powerup and powerdown. The gate output can be disabled by
bringing the CAO/ENBL pin to below 0.8V.
• 100kHz, 200kHz, 400kHz
Oscillator Frequency Options
• Foldback Current Limiting
• Overvoltage and Undervoltage
Fault Windows
• Undervoltage Lockout
• 4Ω Totem Pole Output
• Chip Disable Function
(continued)
BLOCK DIAGRAM
UDG-96188-2
02/99
UCC3830-4/-5/-6
DESCRIPTION (cont.)
CONNECTION DIAGRAM
The voltage and current amplifiers have a 3MHz gain
bandwidth product to satisfy high performance system
requirements. The internal current sense amplifier per-
mits the use of a low value current sense resistor, mini-
mizing power loss. The oscillator frequency is fixed
internally at 100kHz, 200kHz, or 400kHz, depending
upon the option selected. The foldback circuit reduces
the converter short circuit current limit to 50% of its nomi-
nal value when the converter is short circuited. The gate
driver is a 4Ω totem pole output stage capable of driving
an external MOSFET.
SOIC-20 (Top View)
DW Package
This device is available in 20-pin dual in-line and surface
mount packages. The UCC3830-x is specified for opera-
tion from 0°C to 70°C.
Pentium® Pro and Pentium® Pro II are registered trademarks of
Intel Corporation.
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATING
UCC3830
–
Input Supply Voltage VIN . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
D0, D1, D2, D3, D4, VSENSE, VFB, IS+, IS–, CAM Inputs
Maximum Forced Voltage . . . . . . . . . . . . . . . . –0.3V to 5.3V
PWRGOOD Output Maximum Voltage. . . . . . . . . . . . . . . . 5.5V
COMMAND Ouput Maximum Current . . . . . . Internally Limited
Reference Output Current . . . . . . . . . . . . . . . Internally Limited
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Note: Consult factory for temperature range or package op-
tions not shown.
Frequency
FREQUENCY TABLE
100kHz 200kHz 400kHz
Currents are positive into negative out of the specified terminal.
Pulse is defined as a less than 10% duty cycle with a maximum
duration of 500 s. Consult Packaging Section of Databook for
thermal limitations and considerations of packages.
UCC3830-4
UCC3830-5
UCC3830-6
X
X
X
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, VIN = 12V, VSENSE = 3.5V, VD0 = VD1 = VD2 = VD3 =
VD4 = 0V, 0°C < TA < 70°C, TA = TJ.
PARAMETER
Undervoltage Lockout
VIN UVLO Turn-on Threshold
VIN UVLO Turn-off Threshold
UVLO Threshold Hysteresis
Supply Current
TEST CONDITIONS
MIN
TYP
MAX UNITS
10.5
10
10.8
700
V
V
9.5
200
500
mV
lIN
D0 through D4 = Open
7.5
13.5
mA
DAC/Reference
COMMAND Voltage Accuracy
D0-D4 Voltage High
D0-D4 Input Bias Current
OVP Comparator
10.8V < VIN < 13.2V, IVREF = 0mA, 0°C < TA < 70°C
DX Pin Floating
–1
4
1
%
V
5
5.2
–20
DX Pin Tied to GND
–100
–70
µA
Trip Point
% Over COMMAND Voltage (Note 1), D0 = D1 = D2 = D4
= Open, D3 = GND
10
17.5
25
%
Hysteresis
20
30
mV
VSENSE Input Bias Current
OV, OVP, UV Combined
2
–0.5
–0.1
0.5
µA
UCC3830-4/-5/-6
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, VIN = 12V, VSENSE = 3.5V, VD0 = VD1 = VD2 = VD3 =
VD4 = 0V, 0°C < TA < 70°C, TA = TJ.
PARAMETER
OV Comparator
TEST CONDITIONS
MIN
TYP
MAX UNITS
Trip Point
% Over COMMAND Voltage (Note 1), D0 = D1 = D2 = D4
= Open, D3 = GND
5
8.5
20
12
%
Hysteresis
30
mV
PWRGOOD Equivalent Resistance VSENSE = 2.0V
470
Ω
UV Comparator
Trip Point
% Over COMMAND Voltage (Note 1), D0 = D1 = D2 = D4 –12
= Open, D3 = GND
–8.5
20
–5
30
%
Hysteresis
mV
Voltage Error Amplifier
Input Bias Current
Open Loop Gain
VCM = 3.0V
–0.5 –0.02
80
0.5
µA
1.5V < VCOMP < 2.5V, D4 = D3 = D2 = D1 = GND, D0 =
Open
dB
Power Supply Rejection Ratio
Output Sourcing Current
Output Sinking Current
Current Sense Amplifier
Gain
10.8V < VIN < 15V
85
dB
mA
mA
VVFB = 2V, VCOMMAND = VCOMP = 2.5V
VVFB = 3V, VCOMMAND = VCOMP = 2.5V
–0.5
–0.3
0.5
1
14.25
15.25
V/V
kΩ
dB
Input Resistance
3
60
80
–0.5
8
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Sourcing Current
Output Sinking Current
Current Amplifier
Input Offset Voltage
Input Bias Current
0V < VCM < 4.5V
10.8V < VIN < 15V
dB
VIS– = 2V, VISOUT = VIS+ = 2.5V
VIS– = 3V, VISOUT = VIS+ = 2.5V
–0.3
12
mA
mA
5
VCM = 3.0V
–12
mV
µA
dB
V
VCM = 3.0V
–0.1
80
3.2
80
–1
5
Open Loop Gain
1V < VCAO/ENBL < 2.5V
VCOMP = 3V, VCAM = 2.5V
10.8V < VIN < 15V
Output Voltage High
Power Supply Rejection Ratio
Output Sourcing Current
Output Sinking Current
Oscillator
dB
mA
mA
VCAM = 2V, VCAO/ENBL = VCOMP = 2.5V
VCAM = 3V, VCAO/ENBL = VCOMP = 2.5V
–0.5
3
Frequency (-4)
85
100
200
400
1
115
230
460
kHz
kHz
kHz
%
Frequency (-5)
170
340
Frequency (-6)
Frequency Change With Voltage
Output Section
10.8V < VIN < 15V
Maximum Duty Cycle
Output Low Voltage
Output High Voltage
Rise Time
90
95
0.2
11.8
20
99
%
V
IGATE = –100mA
IGATE = 100mA
CGATE = 3.3nF
CGATE = 3.3nF
V
70
70
ns
ns
Fall Time
15
Foldback Current Limit
Clamp Level
Measured at Voltage EA Output;
VSENSE = VCOMMAND = 3V
4.28
3.64
V
V
VCOMMAND = 3V, VSENSE = 0
Note 1: This percentage is measured with respect to the ideal COMMAND voltage programmed by the D0 - D4 pins.
3
UCC3830-4/-5/-6
PIN DESCRIPTIONS
CAM (Current Amplifier Inverting Input): The average respect to GND. Bypass capacitors on the VCC and
load current feedback from ISOUT is applied through a VREF pins should be connected directly to the ground
resistor to this pin. The current loop compensation plane near the GND pin.
network is also connected to this pin (see CAO/ENBL
below).
IS– (Current Sense Amplifier Inverting Input): This pin
is the inverting input to the current sense amplifier and is
CAO/ENBL (Current Amplifier Output/Chip Enable): connected to the low side of the average current sense
The current loop compensation network is connected resistor.
between this pin and CAM. The voltage on this pin is the
input to the PWM comparator and regulates the output
IS+ (Current Sense Amplifier Noninverting Input):
This pin is the noninverting input to the current sense
voltage of the system. The GATE output is disabled
amplifier and is connected to the high side of the
(held low) unless the voltage on this pin exceeds 1V,
average current sense resistor.
allowing the PWM to force zero duty cycle when
ISOUT (Current Sense Amplifier Output): This pin is
the output of the current sense amplifier. The voltage on
this pin is (COMMAND + GCSA • I • RSENSE), where
COMMAND is the voltage on the COMMAND pin, GCSA
is the fixed gain of the current sense amplifier, equal to
15, I is the current through the sense resistor, and
RSENSE is the value of the average current sensing
resistor.
necessary. The PWM forces maximum duty cycle when
the voltage on CAO/ENBL exceeds the oscillator peak
voltage (3V). A 3.2V clamp circuit prevents the
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.
COMMAND (Digital-to-Analog Converter Output
Voltage): This pin is the output of the 5-bit
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
1.2kΩ and must therefore drive only high impedance
inputs if accuracy is to be maintained. Bypass
COMMAND with a 0.01µF, low ESR, low ESL capacitor
for best circuit noise immunity.
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 0.10µF.
PWRGOOD
(Undervoltage/Lower
Overvoltage
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
470Ω. The OV and UV comparators’ hysteresis is fixed
at 20mV independent of the COMMAND voltage.
COMP (Voltage Amplifier Output): The system voltage
compensation network is applied between COMP and
VFB.
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.
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 70µA current
source.
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
0.01µF.
GATE (PWM Output, MOSFET Driver): This output
provides a 4Ω 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
4
UCC3830-4/-5/-6
PIN DESCRIPTIONS (cont.)
VSENSE (Output Voltage Sensing Input): This pin is microprocessor. When the voltage on VSENSE rises
connected to the system output voltage through a low above the COMMAND voltage by 17.5%, the OVP
pass filter. When the voltage on VSENSE rises above or comparator pulls the current amplifier output voltage
falls below the COMMAND voltage by 8.5%, the below the oscillator valley voltage to force zero duty
PWRGOOD output is driven low to reset the cycle at the GATE output. This pin is also used by the
foldback current limiting circuitry.
TYPICAL PERFORMANCE CURVES
The curves shown in Figures 1 and 2 depict the typical fiers. These high gain-bandwidth devices help achieve
high gain-bandwidth products for the UCC3830-x Voltage an excellent transient response to load and line changes.
Amplifier, Current Amplifier and Current Sense Ampli-
Figure 2. Current sense amplifier gain vs frequency.
Figure 1. Open loop gain for UCC3830 voltage and
current amplifier.
APPLICATION INFORMATION
Short Circuit Current Limit
The short circuit current limit, ISC, is set according to:
1.28V
ISC =
RSENSE • GCSA
where RSENSE is the average current sense resistor and
GCSA is the current sense amplifier gain. GCSA equals
15.
Example: Choose RSENSE to set the short circuit limit at
17A using the UCC3830-5
1.28V
RSENSE =
= 0.005Ω.
17A •15
A lower resistance value may be needed if the AC ripple
current in the inductor is more than 20% of the load cur-
rent.
Figure 3. Short circuit foldback reduces stress on
circuit components by reducing short circuit current.
5
UCC3830-4/-5/-6
APPLICATION INFORMATION (cont.)
UDG-96189
Figure 4. Disabling the UCC3830-x.
The UCC3830-x incorporates short circuit current
foldback, as shown in Figure 3. When the output of the
power supply is short circuited, the output voltage falls.
When the output voltage reaches 1/2 of its nominal volt-
age (COMMAND/2) then the output current is reduced.
This feature reduces the amount of current in the
MOSFET, diode and capacitors, and insures high reliabil-
ity.
Figure 5. Input capacitors current waveform.
Setting the Output Voltage Using the DAC
The 5-bit Digital-to-Analog Converter (DAC) is pro-
grammed according to Table 1. The COMMAND voltage
is always active as long as the UCC3830 VIN pin is
above the undervoltage lockout voltage. The output gate
drive, GATE, is disabled at certain DAC codes, as shown
in Table 1. Disabling the gate drive disables the power
supply.
Enabling/Disabling the UCC3830-x Gate Drive
The CAO/ENBL pin can be used to disable the UCC3830
gate drive by forcing this pin below 0.8V, as shown in
Figure 4. Bringing the voltage below the valley of the
PWM oscillator ramp will insure a 0% duty cycle, effec-
tively disabling the gate drive. A low noise open collector
signal should be used as an Enable/Disable command.
Operating the 5-Bit Controller with Intel’s 4-Bit
Pentium Pro
The UCC3830-x 5-Bit Controller is completely backward
compatible. When the fifth bit, D4 is left open (4-Bit Pro-
cessor in circuit), the UCC3830-x acts as a 4-Bit control-
ler with the COMMAND voltage fully compatible with
®
Intel’s 4-Bit Pentium Pro family.
Digital Command
Command GATEHI/GATELO
Digital Command
Command GATEHI/GATELO
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
D3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Voltage
1.300
1.350
1.400
1.450
1.500
1.550
1.600
1.650
1.700
1.750
1.800
1.850
1.900
1.950
2.000
2.050
Status
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
D4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
D3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
D2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
D1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Voltage
2.000
2.100
2.200
2.300
2.400
2.500
2.600
2.700
2.800
2.900
3.000
3.100
3.200
3.300
3.400
3.500
Status
Note 1
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Table 1. Programming the command voltage for the UCC3830-x.
6
UCC3830-4/-5/-6
APPLICATION INFORMATION (cont.)
Figure 6. Load current vs RMS current for input
capacitors.
Figure 7. Efficiency of UCC3830-5 200kHz demo kit at
2.8V ouput.
UDG-96190-1
Figure 8. UCC3830 configured for 4-bit or 5-bit operation.
7
UCC3830-4/-5/-6
APPLICATION INFORMATION (cont.)
Choosing the Input Capacitor
Figure 6 show the RMS current handled by the total input
capacitance in typical VRM circuits delivering 1.8V to
2.8V and powered from 5V.
The input capacitors are chosen primarily based on their
switching frequency RMS current handling capability and
their voltage rating. The input capacitors must handle Related Publications
virtually all of the RMS current at the switching fre-
quency, even if the circuit does not have an input induc-
tor. The switching current in the input capacitors
U-156 and U-157 are Unitrode Application Notes describ-
ing the operation of the UC3886 and the UC3886/
UC3910 together in a Pentium® Pro application.
appears as shown in Figure 5.
Typical Application
The amount of RMS current in an Aluminum Electrolytic
capacitor has a strong impact on the reliability and life-
time of the capacitor. Other factors which affect the life
of an input capacitor are internal heat rise, external air-
flow, the amount of time that the circuit operates at maxi-
mum current and the operating voltage. The curves in
The UCC3830-x is ideal for converting the 5.0V system
bus into the required Pentium® Pro bus voltage. The
3.3V system bus can also be converted using the
UCC3830-x when the Pentium® Pro requires lower bus
voltages.
Table I. Parts list.
REFERENCE
DESIGNATOR
DESCRIPTION
PACKAGE
U1
C1
Unitrode UCC3830DWP-5 DAC/PWM
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sprague/Vishay 595D475X0016A2B, 4.7µF 16V Tantalum
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sanyo 6MV1500GX, 1500µF, 6.3V, Aluminum Electrolytic
Sprague 593D107X9010D2, 100µF, 6.3V Tantalum
0.10µF Ceramic
SOIC-20 Wide
10x20mm Radial Can
10x20mm Radial Can
10x20mm Radial Can
10x20mm Radial Can
SPRAGUE Size A
10x20mm Radial Can
10x20mm Radial Can
10x20mm Radial Can
10x20mm Radial Can
10x20mm Radial Can
EIA Size D SMD
1206 SMD
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
CR1
L1
0.01µF Ceramic
0603 SMD
0.01µF Ceramic
0603 SMD
0.01µF Ceramic
0603 SMD
1000pF Ceramic
0603 SMD
0.10µF Ceramic
1206 SMD
33pF NPO Ceramic
0603 SMD
1500pF Ceramic
0603 SMD
82pF NPO Ceramic
0603 SMD
0.10µF Ceramic
1206 SMD
0.10µF Ceramic
1206 SMD
International Rectifier 32CTQ030 30V, 30A Schottky Diode
Micrometals T50-52B, 10 Turns #16AWG, 4.5µH
TO-220AB
Toroid
8
UCC3830-4/-5/-6
Table I. Parts list. (cont.)
DESCRIPTION
REFERENCE
DESIGNATOR
PACKAGE
Q1
R1
International Rectifier IRL3103, 30V, 56A
TO-220AB
SMD Power Package
0603 SMD
Dale/Vishay WSR-2 0.005Ω 1%
10Ω, 5%, 1/16 Watt
R2
R3
8.2kΩ, 5%, 1/16 Watt
0603 SMD
R4
6.81kΩ, 1%, 1/16 Watt
0603 SMD
R5
3.92kΩ, 1%, 1/16 Watt
0603 SMD
R6
261kΩ, 1%, 1/16 Watt
0603 SMD
R7
100kΩ, 1%, 1/16 Watt
0603 SMD
R8
3.92kΩ, 1%, 1/16 Watt
0603 SMD
R9
10.5kΩ, 1%, 1/16 Watt
0603 SMD
Q1-HS
CR1-HS
AAVID 576802 TO-220 Heat Sink
AAVID 577002 TO-220 Heat Sink
TO-220AB
TO-220AB
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
9
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