NCP1395A Datasheet PDF - ON Semiconductor

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NCP1395A
ON Semiconductor

Part Number NCP1395A
Description High Performance Resonant Mode Controller
Page 27 Pages


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NCP1395A/B
High Performance Resonant
Mode Controller
The NCP1395A/B offers everything needed to build a reliable and
rugged resonant mode power supply. Its unique architecture includes
a 1.0 MHz Voltage Controller Oscillator whose control mode brings
flexibility when an ORing function is a necessity, e.g. in multiple
feedback paths implementations. Protections featuring various
reaction times, e.g. immediate shutdown or timer−based event,
brown−out, broken optocoupler detection etc., contribute to a safer
converter design, without engendering additional circuitry
complexity. An adjustable deadtime also helps lowering the
shoot−through current contribution as the switching frequency
increases.
Finally, an onboard operational transconductance amplifier allows
for various configurations, including constant output current working
mode or traditional voltage regulation.
Features
High Frequency Operation from 50 kHz up to 1.0 MHz
Selectable Minimum Switching Frequency with "3% Accuracy
Adjustable Deadtime from 150 ns to 1.0 ms
Startup Sequence via an Adjustable Soft−Start
Brown−Out Protection for a Simpler PFC Association
Latched Input for Severe Fault Conditions, e.g. Overtemperature
or OVP
Timer−Based Input with Auto−Recovery Operation for Delayed
Event Reaction
Enable Input for Immediate Event Reaction or Simple ON/OFF
Control
Operational Transconductance Amplifier (OTA) for Multiple
Feedback Loops
VCC Operation up to 20 V
Low Startup Current of 300 mA Max
Common Collector Optocoupler Connection
Internal Temperature Shutdown
B Version Features 10 V VCC Startup Threshold for Auxiliary
Supply Usage
Easy No−Load Operation and Low Standby Power Due to
Programmable Skip−Cycle
These are Pb−Free Devices*
Typical Applications
LCD/Plasma TV Converters
High Power Ac−DC Adapters for Notebooks
Industrial and Medical Power Sources
Offline Battery Chargers
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MARKING
DIAGRAMS
16
1
PDIP−16
P SUFFIX
CASE 648
16
NCP1395xP
AWLYYWWG
1
16
1
SO−16
D SUFFIX
CASE 751B
1395xDR2G
AWLYWW
x
A
WL
YY, Y
WW
G
= A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
Fmin 1
Fmax 2
DT 3
Css 4
FB 5
Ctimer 6
BO 7
AGnd 8
16 NINV
15 Out
14 Slow Fault
13 Fast Fault
12 Vcc
11 B
10 A
9 PGnd
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 25 of this data sheet.
*For additional information on our Pb−Free strategy
and soldering details, please download the ON
Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 1
1
Publication Order Number:
NCP1395/D



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NCP1395A/B
Figure 1. Typical Application Example
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NCP1395A/B
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Function
1
Fmin
Timing Resistor
2
Fmax
Frequency Clamp
3 DT
Deadtime
4 Css
Soft−Start
5 FB
Feedback
6 Ctimer Timer Duration
7 BO
Brown−Out
8 Agnd Analog Ground
9 Pgnd Power Ground
10 A Low Side Output
11 B High Side Output
12 Vcc Supplies the Controller
13
Fast Fault
Quick Fault Detection
14
Slow Fault
Slow Fault Detection
15 OUT OPAMP Output
16
NINV
OPAMP Noninverting
Description
Connecting a resistor to this pin, sets the minimum oscillator frequency
reached for VFB is below 1.3 V.
A resistor sets the maximum frequency excursion.
A simple resistor adjusts the deadtime length.
Select the soft−start duration.
Applying a voltage above 1.3 V on this pin increases the oscillation frequency
up to Fmax.
Sets the timer duration in presence of a fault.
Detects low input voltage conditions. When brought above Vlatch, it fully
latches off the controller.
Drives the low side power MOSFET.
Drives the upper side power MOSFET.
Fast shutdown pin, stops all pulses when brought high. Please look in the
description for more details about the fast−fault sequence.
When asserted, the timer starts to countdown and shuts down the controller at
the end of its time duration.
Internal transconductance amplifier.
Non−inverting pin of the OPAMP.
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NCP1395A/B
Vdd
Fmin
Imin
Vfb = < Vfb_off
Vref +
C IDT
+
DT Adj.
I = Imax for Vfb = 5 V
I = 0 for Vfb < Vfb_off
Vdd
Fmax
Imax
Vfb = 5
Vdd
Vref
Itimer
If FAULT Itimer else 0
SS
S
D
Q
Clk Q
R
50% DC
Temperature
Shutdown
Vref
FF
BO
Reset
PON
Reset
Fault
Timeout
Fault
SS Reset on
A Version Only
Timer
+
Vref
+
Vdd
ISS
SS
Timeout
Fault
PON
Reset
Fault
20 V
UVLO
Fault
FB
RFB
+
+
Vfb_fault
IDT
DT
BO
AGND
Vdd
IBO
+
+
VBO
+
G=1
> 0 only if
V(FB) > Vfb_off
Vdd
+
Vfb_off
Vref
Deadtime
Adjustment
+
+
Vlatch
20 ms Noise
Filter
PON Reset
Figure 2. Internal Circuit Architecture
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4
Vref_FB
+
NINV
− + gm
OUT
+ Slow
Fault
+
Vref Fault
+
Fast
Fault
+
Vref Fault
VCC
B
A
PGND



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