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NCV1034DR2G

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© Semiconductor Components Industries, LLC, 2017
April, 2017 − Rev. 0
1 Publication Order Number:
NCV1034/D
NCV1034
100V Synchronous PWM
Buck Controller
Description
The NCV1034 is a high voltage PWM controller designed for high
performance synchronous Buck DC/DC applications with input voltages
up to 100 V. The NCV1034 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 NCV1034 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 and Undervoltage Protection
• Hiccup Current Limit Using MOSFET R
DS(on)
Sensing
• External Frequency Synchronization
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
• These Devices are Pb−Free and are RoHS Compliant
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
Figure 1. Typical Application Circuit
12
5
15
4
16
1
14
10
11
13
7
6
2
3
R7
11k
R6
20k
C5
220n
R5
3k9
VCC
SYNC
RT
UVLO
OCSET
GND
HDRV
VS
OCIN
LDRV
PGND
FB
COMP
SS/SD
C2
100n
C3
100n
D1
1N4148
C4
100n
R4
110k
V
CC
: 12 V
IC1
NCP1034
89
DRVVCC VB
R3
4k7
C7
330p
C6
12n
R8
10k
V
IN
: 48 V
C1A
2u2
C9
47
C9B
47
Q1
NTD3055
Q2
NTD24N06
L1
13
R2
5k6
R1
16k9
R9
1k2
V
OUT
5 V @ 5 A, 200 kHz
C8
1n8
R10
10k
GND GND GND GND GND
GND
GND GND
GND
GND
C1B
2u2
C9C
47
1
2
3
4
5
6
7
8
16
12
11
10
9
(Top View)
SYNC
OCset
FB
Comp
SS/SD
PGND
LDRV
DRVCC
UVLO
VCC
VS
VB
HDRV
13
OCIN
15
14
RT
GND
SOIC−16
D SUFFIX
CASE 751B
NCV1034D
AWLYWWG
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb−Free Package
MARKING
DIAGRAM
PIN CONNECTIONS
www.
onsemi.com
See detailed ordering and shipping information in the packag
e
dimensions section on page 23 of this data sheet.
ORDERING INFORMATION
NCV1034
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2
Figure 2. Internal Block Diagram
Bias
Generator
POR
1.25V = Vref
VCC
GND
5V = VBIAS
Oscillator
SYNC
Rt
Ct
Rt
Vcc UVLO
S
R
Reset Dom
Q
High
Voltage
Level
Shift
Circuit
UV
Detect
S
R
UV
Q
Vb
HDrv
Vs
DrvVCC
LDrv
PGND
Clk
D
POR
0.3V0.3V
SS/SD
Comp
Fb
1.25V
25k
POR
VBIAS
20uA
1uA
64uA Max
OCP
VBIAS
OCin
Active
Clamp
VBIAS
Error Amp
Error
Comparator
UV
Detect
Delay
LS
AC ON
OCset
AC ON
Negative
Output
S
R
Q
OCP
OCP Reset
SS/SD
0.25V
Vref
UVLO
Vref
Iocset
0.0410x Iocset
AC ON
FAULT
FAULT
Q
PWM
FAULT
MKO
350ns
PWM
LowUVLO
Positive
Current
OCP
LowUVLO
R
OCP
0.225x Iocset
Positive Current
SS/SD
T
ONMIN
Limit
NCV1034
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3
PIN FUNCTION DESCRIPTION
PIN PIN NAME DESCRIPTION
1 OC
set
Current limit set point. A resistor from this pin to GND will set the positive and negative current limit threshold
2 FB Inverting input to the error amplifier. This pin is connected directly to the output of the regulator via resistor
divider to set the output voltage and provide feedback to the error amplifier.
3 COMP Output of error amplifier. An external resistor and capacitor network is typically connected from this pin to ground
to provide loop compensation.
4 SS/SD Soft−Start / Shutdown. This pin provides user programmable soft−start function. External capacitor connected
from this pin to ground sets the startup time of the output voltage. The converter can be shutdown by pulling this
pin below 0.3 V.
5 SYNC The internal oscillator can be synchronized to an external clock via this pin and other IC’s can be synchronized
via this pin to internal oscillator. If it is not used this pin should be connected via 10 k resistor to ground.
6 P
GND
Power Ground. This pin serves as a separate ground for the MOSFET driver and should be connected to the
system’s power ground plane.
7 LDRV Output driver for low side MOSFET.
8 DRVV
CC
This pin provides biasing for the internal low side driver. A minimum of 0.1 F, high frequency capacitor must be
connected from this pin to power ground.
9 VB This pin powers the high side driver and must be connected to a voltage higher than input voltage. A minimum of
0.1 F, high frequency capacitor must be connected from this pin to switch node.
10 HDRV Output driver for high side MOSFET
11 V
S
Switch Node. This pin is connected to the source of the upper MOSFET and the drain of the lower MOSFET.
This pin is return path for the upper gate driver.
12 V
CC
This pin provides power for the internal blocks of the IC. A minimum of 0.1 F, high frequency capacitor must be
connected from this pin to ground.
13 OC
IN
Overcurrent sensing input. A serial resistor from this pin to drain of low MOSFET must be used to limit the
current into this pin.
14 GND Signal ground for internal reference and control circuitry.
15 R
T
Connecting a resistor from this pin to ground sets the oscillator frequency.
16 UVLO An external voltage divider is used to set the undervoltage threshold levels.
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NCV1034DR2G

Mfr. #:
Buy NCV1034DR2G
Manufacturer:
ON Semiconductor
Description:
Switching Voltage Regulators HV PWM BUCK CONTROLLER
Lifecycle:
New from this manufacturer.
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