NCP1398B/C
High Performance Resonant
Mode Controller with
Integrated High-Voltage
Drivers
The NCP1398 is a high performance controller for half bridge LLC
resonant converters. The integrated high voltage gate driver simplifies
layout and reduces external component count. A unique architecture,
which includes a 750 kHz Voltage Controlled Oscillator whose control
mode permits flexibility when an ORing function is required allows
the NCP1398 to deliver everything needed to build a reliable and
rugged resonant mode power supply. The NCP1398 provides a suite of
protection features with configurable settings allow optimization in
any application. This includes: auto−recovery and latch−off
over−current protection, brown−out detection, open optocoupler
detection, adjustable soft−start and dead−time.
Features
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SOIC−16 NB, Less Pin 13
D SUFFIX
CASE 751AM
MARKING DIAGRAM
16
NCP1398xG
AWLYWW
1
x
A
WL
Y
WW
G
= B or C
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
High−Frequency Operation from 50 kHz up to 750 kHz
Adjustable Minimum Switching Frequency with
±
3% Accuracy
Adjustable Dead−Time
Startup Sequence Via an Externally Adjustable Soft−Start
Precise and High Impedance Brown−Out Protection
Latched Input for Severe Fault Conditions, e.g. Over Temperature or
OVP
Timer−Based Auto−Recovery Overcurrent Protection
Latched Output Short−Circuit Protection
Open Feedback Loop Protection for NCP1398B Version
Disable Input for ON/OFF Control
Skip Mode with Adjustable Hysteresis
V
CC
Operation up to 20 V
1 A / 0.5 A Peak Current Sink / Source Drive Capability
Common Collector Optocoupler Connection for Easier ORing
Internal Temperature Shutdown
Designed with Pin−to−Adjacent−Pin Short Testing Safety
Considerations
Designed with Open Pin Testing Safety Considerations
These Devices are Pb−Free and Halogen Free/BFR Free
Flat panel Display Power Converters
High Power AC/DC Adapters
Computing Power Supplies
Industrial and Medical Power Sources
Offline Battery Chargers
PIN CONNECTIONS
BO 1
Ctimer 2
Discharge 3
Fmax 4
Rt 5
DT 6
FB 7
Skip/Disable 8
(Top View)
12 V
CC
11 GND
10 Mlower
9 OLP
16 Vboot
15 HB
14 Mupper
Typical Applications
ORDERING INFORMATION
See detailed ordering and shipping information on page 23 of
this data sheet.
©
Semiconductor Components Industries, LLC, 2013
January, 2013
−
Rev. 0
1
Publication Order Number:
NCP1398/D
NCP1398B/C
HV
Rupper
FB
OVP
R1
R2
M1
+
C5
R3
U5
1
Rdis
2
3
4
5
6
7
8
Rocp
Rss
CBO
Cocp
Css
Rt
Rfmax
Rfmin Rfb Rskip_out Rlower
Ct
RDT
D2
C2
+
C3
R8
C4
U1
R9
R2
BO
Ctimer
Vboot
HB
R7
D5
D1
OK1
OK2
16
15
14
R4
C1
Ls
D6
M2
R10
+
C7
R11
FB
C6
D3
D4
Cs
R13
C9
T1
D7
OK1
C8
OK2
R1
OVP
Vout
R12
Discharge Mupper
Fmax
Rt
DT
VCC
GND
Mlower
OLP
12
11
10
9
R5
R6
FB
Skip/disable
OCP Input
D8
Figure 1. Typical Application Example
PIN FUNCTION DESCRIPTION
Pin N5
1
2
3
4
Pin Name
BO
Ctimer
Discharge
Fmax
Function
Brown−Out
Fault timer duration
Overload protection
Maximum frequency clamp
Pin Description
Detects low input voltage conditions. When brought above Vlatch (4V),
fully latches off the controller.
Sets the fault timer and auto−recovery durations
Implements frequency shift in case of overload.
A resistor connected between this pin and GND sets the maximum fre-
quency excursion. Controller enters skip mode and disables drivers if
the operating frequency exceeds this adjusted value.
Connecting a resistor to this pin, sets the minimum oscillator frequency
reached for VFB = 1.1 V. Discharge OCP and Soft Start networks before
startup or reset.
A simple resistor adjusts the dead−time
Voltage on this pin modulates operating frequency between adjusted
Fmin and Fmax clamps. Starts Fault timer when FB voltage stays below
0.28 V
−
function not active on NCP1398C version.
Defines frequency and thus also FB voltage under which the controller
returns from skip mode. Upon release, a clean startup sequence occurs
if VFB < 0.28 V. During the skip mode, when FB doesn’t drop below
0.28 V, the IC restarts without soft start sequence.
Initiates fault timer when asserted. Increases operating frequency via
discharge pin to protect application power stage. This input features
also latch fault comparator that latches off the IC permanently.
Drives the lower side MOSFET
−
The controller accepts up to 20 V
Increases the creepage distance
Drives the higher side MOSFET
Connects to the half−bridge output
The floating V
CC
supply for the upper stage
5
Rt
Minimum frequency clamp
6
7
DT
FB
Dead−time adjust
Feedback
8
Skip/Disable
Skip or Disable input
9
OLP
Overload protection detection
input
Low side output
IC ground
Supplies the controller
Not connected
High side output
Half−bridge connection
Bootstrap pin
10
11
12
13
15
14
16
Mlower
GND
V
CC
NC
Mupper
HB
Vboot
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2
NCP1398B/C
Figure 2. Internal Circuit Architecture – NCP1398C
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3
NCP1398B/C
Figure 3. Internal Circuit Architecture – NCP1398B
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4
NCP1398B/C
MAXIMUM RATINGS
Rating
High Voltage bridge pin
Floating supply voltage
High side output voltage
Low side output voltage
Allowable output slew rate
FB and V
CC
pin voltage (pins 7 and 12)
Maximum voltage, all pins (except pins 7, 12, 14, 15 and 16)
Thermal Resistance Junction−to−Air, PDIP version
Thermal Resistance Junction−to−Air, SOIC version
Storage Temperature Range
ESD Capability, HBM model , Except pins 14, 15, 16
ESD Capability, Machine Model
Symbol
VBRIDGE
VBOOT
−
VBRIDGE
VDRV_HI
VDRV_LO
dV
BRIDGE
/dt
V
CC
−
RqJ−A
RqJ−A
−
−
−
Value
−1
to 600
0 to 20
VBRIDGE−0.3 to
VBOOT+0.3
−0.3
to V
CC
+ 0.3
50
−0.3
to 20
−0.3
to 10
100
130
−60
to +150
2
200
Unit
V
V
V
V
V/ns
V
V
°C/W
°C/W
°C
kV
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device(s) contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per JEDEC Standard JESD22−A114E
Machine Model 200 V per JEDEC Standard JESD22−A115−A
2. This device meets latch−up tests defined by JEDEC Standard JESD78.
ELECTRICAL CHARACTERISTICS
(For typical values T
J
= 25°C, for min/max values T
J
=
−40°C
to +125°C, Max T
J
= 150°C, V
CC
= 12 V unless otherwise noted)
Symbol
SUPPLY SECTION
VCC
ON
VCC
(min)
Vboot
ON
Vboot
(min)
Istartup
VCC
reset
ICC1+Iboot1
Turn−on threshold level, Vcc going up
Minimum operating voltage after turn−on
Startup voltage on the floating section
Cutoff voltage on the floating section
Startup current, V
CC
< VCC
ON
V
CC
level at which the internal logic gets reset
Internal IC consumption, no output load on pin 15/14 – 11/10,
Fsw = 300 kHz, Rdt = 10 kW, RT = 31 kW, RFmax = 7.2 kW,
RSkip/Disable = 7.9 kW, VFb = 3.6 V
Internal IC consumption, 1 nF output load on pin 15/14 – 11/10,
Fsw = 300 kHz, Rdt = 10 kW, RT = 31 kW, RFmax = 7.2 kW,
RSkip/Disable = 7.9 kW, VFb = 3.6 V
Consumption in fault or disable mode, All drivers disabled, Rdt
=10 kW, RFmin = 31 kW, RFmax = 7.2 kW, RSkip/Disable =
7.9 kW, VFb = 1 V
Consumption in skip mode , All drivers disabled, Rdt =10 kW,
RFmin = 31 kW, RFmax = 7.2 kW, RSkip/Disable = 7.9 kW,
VFb = 5.7 V
12
12
16−15
16−15
12
12
12−11
16−15
12−11
16−15
12−11
16−15
12−11
16−15
9.7
8.7
8
7.4
−
−
−
10.5
9.5
9
8.4
−
6.6
5.1
11.3
10.3
10
9.4
620
−
−
V
V
V
V
mA
V
mA
Rating
Pin
Min
Typ
Max
Unit
ICC2+Iboot2
−
13.3
−
mA
ICC3+Iboot3
−
1.05
−
mA
ICC4+Iboot4
−
2.2
−
mA
VOLTAGE CONTROL OSCILLATOR (VCO)
Fsw_min
Minimum switching frequency, Rt = 31 kW on pin 5, Vpin 7 =
0.8 V, DT = 300 ns
0 to 125°C
−40
to 125°C
5
58.2
57.2
60
60
61.8
61.8
kHz
3. Guaranteed by design.
4. Not tested for NCP1398C.
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