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PDF NCP1034 Data sheet ( Hoja de datos )
| Número de pieza | NCP1034 | |
| Descripción | 100V Synchronous PWM Buck Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1034
100V Synchronous PWM
Buck Controller
Description
The NCP1034 is a high voltage PWM controller designed for high
performance synchronous Buck DC/DC applications with input
voltages up to 100 V. The NCP1034 drives a pair of external
N−MOSFETs. The switching frequency is programmable from
25 kHz up to 500 kHz allowing the flexibility to tune for efficiency
and size. A synchronization feature allows the switching frequency to
be set by an external source or output a synchronization signal to
multiple NCP1034 controllers. The output voltage can be precisely
regulated using the internally trimmed 1.25 V reference voltage for
low voltage applications. Protection features include user
programmable undervoltage lockout and hiccup current limit.
Features
• High Voltage Operating up to 100 V
• Programmable Switching Frequency up to 500 kHz
• 2 A Output Drive Capability
• Precision Reference Voltage (1.25 V)
• Programmable Soft−Start with Prebiased Load Capability
• Programmable Overcurrent Protection
• Programmable Undervoltage Protection
• Hiccup Current Limit Using MOSFET RDS(on) Sensing
• External Frequency Synchronization
• 16 Pin SOIC Package
• This is a Pb−Free Device
Applications
• 48 V Non−Isolated DC−DC Converter
• Embedded Telecom Systems
• Networking and Computing Voltage Regulator
• Distributed Point of Load Power Architectures
• General High Voltage DC−DC Converters
www.onsemi.com
SOIC−16
D SUFFIX
CASE 751B
MARKING
DIAGRAM
NCP1034D
AWLYWWG
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
OCset 1
FB 2
Comp 3
SS/SD 4
SYNC 5
PGND 6
LDRV 7
DRVCC 8
16 UVLO
15 RT
14 GND
13 OCIN
12 VCC
11 VS
10 HDRV
9 VB
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
R4
110k
VCC: 12 V
C2 C3
100n 100n
GND GND R10
GND
10k
D1
1N4148
89
12 VCC DRVVCC VB
5 SYNC
15 RT
4
SS/SD
16 UVLO
HDRV
VS
OCIN
LDRV
PGND
10
11
13
7
6
VIN: 48 V
C4
100n
R8
10k
C1A
2u2
C1B
2u2
GND
Q1
NTD3055
L1
13m
Q2
NTD24N06
C9
47m
1 OCSET
FB 2
14 GND
COMP 3
C5
R5
3k9 220n
R6
20k
R7
11k
IC1
NCP1034
C6
R3 12n
4k7
C7
GND GND GND GND GND
330p
Figure 1. Typical Application Circuit
VOUT
5 V @ 5 A, 200 kHz
C9B C9C
47m 47m
R1
16k9
R9
1k2
C8
1n8
R2
5k6
GND
© Semiconductor Components Industries, LLC, 2015
September, 2015 − Rev. 7
1
Publication Order Number:
NCP1034/D
1 page  
NCP1034
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over VCC = 12 V,
DRVVCC = VB = 12 V, −40°C < TJ < 125°C)
Parameter
Symbol
Test Condition
Min Typ Max Unit
REFERENCE VOLTAGE
Feedback Voltage
Accuracy
VFB 1.25 V
−40°C < TJ < 125°C
−1.5
+1.5
%
FB Voltage Line Regulation
SUPPLY CURRENT
LREG
10 V < VCC < 18 V (Note 3)
2.0 mV
VCC Supply Current (Stat)
DRVVCC Supply Current (Stat)
VB Supply Current (Stat)
UNDERVOLTAGE LOCKOUT
ICC(Static)
IC(Static)
IB(Static)
SS = 0 V, No Switching, RT = 10 kW,
ROCSET = 10 kW
SS = 0 V, No Switching
SS = 0 V, No Switching
2.0 3.0 mA
0.1 0.3 mA
0.1 0.3 mA
VCC−Start−Threshold
VCC−Stop−Threshold
VCC−Hysteresis
DRVCC−Start−Threshold
DRVCC−Stop−Threshold
DRVCC−Hysteresis
VB−Start−Threshold
VB−Stop−Threshold
VB−Hysteresis
Undervoltage Threshold Value
Undervoltage Threshold Value
OSCILLATOR
VCC_UVLO (R)
VCC_UVLO (F)
DRVCC_UVLO (R)
DRVCC_UVLO (F)
VB_UVLO (R)
VB_UVLO (F)
UUVLO (Rising)
UUVLO (Falling)
Supply Ramping Up
Supply Ramping Down
Supply Ramping Up and Down
Supply Ramping Up
Supply Ramping Down
Supply Ramping Up and Down
Supply Ramping Up
Supply Ramping Down
Supply Ramping Up and Down
7.9 8.9 9.8
7.3 8.2 9.0
0.7
7.9 8.9 9.8
7.3 8.2 9.0
0.7
7.9 8.9 9.8
7.3 8.2 9.0
0.7
1.19 1.25 1.31
1.10 1.15 1.20
V
V
V
V
V
V
V
V
V
V
V
Frequency
Ramp Amplitude
Min Duty Cycle
Min Pulse Width
Max Duty Cycle
SYNC Frequency Range
FS
Vramp
Dmin
Dmin(ctrl)
Dmax
SYNC(FS)
RT = 20 kW
RT = 10 kW
(Note 3)
FB = 2 V
FS = 200 kHz, (Note 3)
FS = 400 kHz, FB = 1.2 V
20% Above Free Running
Frequency
170 200 230 kHz
320 375 430
2.0 V
0%
200 ns
80 %
500 kHz
SYNC Pulse Duration
SYNC(pulse)
200 ns
SYNC High Level
SYNC(H)
2.0 V
SYNC Low Level
SYNC(L)
0.8 V
SYNC Input Threshold
SYNC(Thre)
1.6 V
SYNC Input Hysteresis
SYNC(Hyst)
300 mV
SYNC Input Impedance
SYNC(ZIN)
(Note 3)
16 kW
SYNC Output Impedance
SYNC(OUT)
(Note 3)
2.5 kW
SYNC Output Pulse Width
SYNC(Pulse Width)
FS = 500 kHz, (Note 3)
300 ns
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
2. Cold temperature performance is guaranteed via correlation using statistical quality control. Not tested in production.
3. Guaranteed by design but not tested in production.
www.onsemi.com
5
5 Page 
NCP1034
APPLICATION INFORMATION
Undervoltage Lock−out
There are four undervoltage lock−out circuits. Two of
them protect external high−side and low−side drivers, the
third ensures that the IC does not start until VCC is under a
set threshold. The last one can be programmed by the user.
It has a rising threshold at 1.25 V and a falling threshold at
1.15 V, and the user can define the undervoltage level by an
external resistor divider. If the voltage is not over the
threshold value, the device stops operating. The high−side
driver UVLO only stops switching the high−side MOSFET
Programmed falling and rising UVLO voltage can be
calculated by Equations 1 and 2:
ǒ ǓVUVLO,falling + 1.15 @
1 ) R4
R5
(eq. 1)
and
ǒ ǓVUVLO,rising + 1.25 @
1 ) R4
R5
(eq. 2)
Shutdown
The output voltage can be disabled by pulling the
SS/SD pin below 0.3 V. A small transistor can be used to pull
it down as shown in Figure 19. During this time, both
external MOSFETs are turned off. After the SS/SD pin is
released, the IC starts its operation with a soft−start
sequence.
SS/SD
SS/SD
Figure 19. Shutdown Interface
500
450
400
350
300
250
200
150
100
50
0
0
50 100
150 200 250
Rt (kW)
Figure 20. Frequency Dependence of Rt Value
Frequency Synchronization
The NCP1034 can be synchronized to an external clock
signal. The input synchronization signal should be a TTL
logic level. The oscillator is synchronized to the rising edge
of the synchronizing signal. When synchronization is used,
the free running frequency must be set by the timing resistor
to a frequency at least 80% of the external synchronization
frequency (Example: RT = 20 kW / 200 kHz and external
TTL = 220 kHz).
The NCP1034 can also output synchronization pulses on
the SYNC pin. Pulses are generated when the internal
oscillator ramp reaches the high threshold voltage. The
frequency of these pulses is set by an external RT resistor. Up
to five NCP1034 controllers can be connected directly to the
SYNC pin, all of which are synchronized to the controller
with the highest frequency. The lowest frequency must be at
least 80% of the highest one.
The equivalent internal circuit of the Sync pin is shown in
Figure 21.
Operating Frequency Selection
The operating frequency is set by an external resistor
connected from the Rt Pin to ground. The value of this
resistor can be selected from Figure 20, which shows
switching frequency versus the timing resistor value.
SYNC
VBIAS
Rt Oscillator
Rt
Ct
Figure 21. Equivalent Connection of the Sync Pin
www.onsemi.com
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet NCP1034.PDF ] | |
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