ncp1562a ON Semiconductor, ncp1562a Datasheet

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ncp1562a

Manufacturer Part Number
ncp1562a
Description
High Performance Active Clamp/reset Pwm Controller
Manufacturer
ON Semiconductor
Datasheet

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NCP1562A, NCP1562B
High Performance Active
Clamp/Reset PWM Controller
for dc-dc converters requiring high-efficiency and low parts count.
These controllers incorporate two in phase outputs with an overlap
delay to prevent simultaneous conduction and facilitates soft
switching. The main output is designed for driving a forward
converter primary MOSFET. The secondary output is designed for
driving an active clamp circuit MOSFET, a synchronous rectifier on
the secondary side, or an asymmetric half bridge circuit.
incorporating high accuracy on critical specifications such as
maximum duty cycle limit, undervoltage detector and overcurrent
threshold. Two distinctive features of the NCP1562 are soft-stop and
a cycle skip current limit with a time threshold. Soft-stop circuitry
powers down the converter in a controlled manner if a severe fault is
detected. The cycle skip detector enables a soft-stop sequence if a
continuous overcurrent condition is present.
forward, frequency synchronization up to 1.0 MHz, cycle-by-cycle
current limit with leading edge blanking (LEB), independent under
and overvoltage detectors, adjustable output overlap delay,
programmable maximum duty cycle, internal startup circuit and
soft-start.
Features
*For additional information on our Pb-Free strategy and soldering details, please
© Semiconductor Components Industries, LLC, 2007
August, 2007 - Rev. 4
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
The NCP1562x is a family of voltage mode controllers designed
The NCP1562 family reduces component count and system size by
Additional features found in the NCP1562 include line feed-
Dual Control Outputs with Adjustable Overlap Delay
>2.0 A Output Drive Capability
Soft-Stop Powers Down Converter in a Controlled Manner
Cycle-by-Cycle Current Limit
Cycle Skip Initiated if Continuous Current Limit Condition Exists
Voltage Mode Operation with Input Voltage Feedforward
Fixed Frequency Operation up to 1.0 MHz
Bidirectional Frequency Synchronization
Independent Line Undervoltage and Overvoltage Detectors
Accurate Programmable Maximum Duty Cycle Limit
Programmable Maximum Volt-Second Product
Programmable Soft-Start
Internal 100 V Startup Circuit
Precision 5.0 V Reference
These are Pb-Free Devices*
1
16
Typical Applications
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
Telecommunications Power Converters
Low Output Voltage Converters using
Control Driven Synchronous Rectifier
Industrial Power Converters
42 V Automotive System
ATX Power Supplies
ORDERING INFORMATION
1
x
A
WL, L
Y
WW, W = Work Week
http://onsemi.com
CASE 751B
D SUFFIX
SO-16
= Current Limit (A, B)
= Assembly Location
= Wafer Lot
= Year
CASE 948F
TSSOP-16
DT SUFFIX
Publication Order Number:
DIAGRAMS
NCP1562xG
MARKING
AWLYWW
NCP1562A/D
ALYW
NCP
562x

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ncp1562a Summary of contents

Page 1

... NCP1562A, NCP1562B High Performance Active Clamp/Reset PWM Controller The NCP1562x is a family of voltage mode controllers designed for dc-dc converters requiring high-efficiency and low parts count. These controllers incorporate two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET ...

Page 2

... CSKIP(C) 12 CSKIP C CSKIP I CSKIP( ver ver Clock Soft-Stop Complete Soft-Start V REF Soft-Stop Control Logic 10 I SS( SS(D) NCP1562A, NCP1562B V - AUX(on One Shot + 1 V Pulse Thermal V Shutdown STOP Clock CSKIP Comparator + Saturation Comparator - + V CSKIP - CSKIP Control Saturated Logic Clock ...

Page 3

... OUT1. OUT2 has source and sink resistances (typ.). OUT2 is designed to handle PGND Ground connection for OUT1 and OUT2. Tie to the power stage return with a short loop. NCP1562A, NCP1562B Description -C divider from V sets the operating frequency and maximum duty cycle of OUT1. ...

Page 4

... V, the outputs are disabled allowing V supplied to the IC via this pin by means of an auxiliary winding. The startup circuit is disabled once the voltage on the V current is reduced to 200 mA. NCP1562A, NCP1562B Description to this pin. Once the voltage charge. During normal operation, power is AUX pin exceeds 10 ...

Page 5

... Human Body Model 2000 V per MIL–STD–883, Method 3015. Machine Model Method 160 V. Pin 1 is the HV startup of the device and is rated to the max rating of the part, or 100 V. 2. This device contains Latchup protection and exceeds "100 mA per JEDEC Standard JESD78. NCP1562A, NCP1562B Rating http://onsemi.com 5 ...

Page 6

... Offset Current Turn ON Threshold ("5%, I LINE FEEDFORWARD Peak Voltage (Volt-Second Clamp) Discharge Current ( Offset Voltage ( Ramp Down V FF Feedforward Offset Minus Soft-Stop Reset Voltage 3. Guaranteed by design only. NCP1562A, NCP1562B ( 2 AUX UVOV = 0.01 mF 100 pF, C out1 out2 UVOV = 25° ...

Page 7

... J Peak Voltage Valley Voltage Discharge Current (V = 2.3 V) RTCT Maximum Operating Frequency (Note 4) Duty Cycle ( kW) D Adjustable Maximum Duty Cycle (Note 4) 4. Guaranteed by design only. NCP1562A, NCP1562B (continued AUX UVOV = 10 mF 470 pF 100 pF out1 out2 = 29 ...

Page 8

... Fall Time (90 2200 pF, C out1 OUT1 OUT2 PWM COMPARATOR Input Resistance Lower Input Threshold Delay to Output (From Guaranteed by design only. NCP1562A, NCP1562B (continued AUX UVOV = 10 mF 470 pF 100 pF out1 out2 = 29 ...

Page 9

... V - 0.2 V AUX AUX(on -50 - JUNCTION TEMPERATURE (°C) J Figure 4. Startup Current vs. Junction Temperature 100 NCP1562A, NCP1562B 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 100 125 150 -50 -25 Figure 3. Auxiliary Supply Voltage Thresholds ...

Page 10

... Figure 9. Line Under/Overvoltage Thresholds vs. Junction Temperature -50 - JUNCTION TEMPERATURE (°C) J Figure 11. UVOV Offset Current vs. Junction Temperature NCP1562A, NCP1562B 8.0 7 AUX 7.0 6.5 = 100 pF 6.0 5.5 5.0 4.5 4.0 3.5 3.0 100 125 150 10 11 Figure 8. Supply Current vs. Supply Voltage 150 140 130 ...

Page 11

... NCP1562A 200 150 -50 - JUNCTION TEMPERATURE (°C) J Figure 15. Current Limit Threshold Voltage vs. Junction Temperature 100 -50 NCP1562A, NCP1562B 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 100 125 150 -50 -25 T Figure 14. Feedforward Peak Voltage 150 140 130 120 110 100 ...

Page 12

... UVOV 2.5 V REF 0 -50 - JUNCTION TEMPERATURE (°C) J Figure 22. V Discharge Current REF vs. Junction Temperature NCP1562A, NCP1562B 1.25 V CSKIP 100 125 150 -50 -25 Figure 19. Cycle Skip Discharge Current 5.25 1.0 5.20 0.9 0.8 5.15 0.7 5.10 5.05 0.6 5.00 ...

Page 13

... Junction Temperature 500 450 400 350 300 TRAILING 250 200 LEADING 150 100 160 240 R , DELAY RESISTOR (kW) D Figure 28. Overlap Time Delay vs. Delay Resistor NCP1562A, NCP1562B 470 pF AUX 25° ...

Page 14

... Junction Temperature -50 - JUNCTION TEMPERATURE (°C) J Figure 32. V Input Resistance EA vs. Junction Temperature NCP1562A, NCP1562B AUX SOURCE 100 125 150 -50 -25 T Figure 31. Output 2 Drive Resistance 1 ...

Page 15

... V. The preset 1:10 charge:discharge ratio can be reduced by placing an external resistor between the V The resistor should be sized such that the total charge NCP1562A, NCP1562B DETAILED OPERATING DESCRIPTION current does not exceed 100 mA. Otherwise the converter will not be able to complete a soft-stop sequence. Depending on the converter state, a soft-stop sequence is handled differently to ensure the fastest response time and prevent system malfunction ...

Page 16

... Cycle-by-Cycle In cycle-by-cycle, the conduction period ends once the voltage on the CS pin reaches the current limit voltage threshold (V ). The NCP1562A has a V ILIM and the NCP1562B has 0.5 V. ILIM V ILIM ...

Page 17

... C CSKIP Figure 39. External Latch Implemented using Discrete N and P-Channel MOSFETs NCP1562A, NCP1562B A latch implemented using discrete N and P-channel MOSFETs is shown in Figure 39. The latch is enabled once the CSKIP voltage reaches the threshold of M1. Once M1 turns on, it pulls low the gate of M2. CSKIP is then pulled ...

Page 18

... Otherwise, V collapse and the controller will turn OFF. Also, the V discharge time (from 10 7.0 V) must be greater that the soft-start charge period to assure the converter turns NCP1562A, NCP1562B Figure 40. Startup Circuit Waveforms above ON. The IC bias current, gate charge load on the outputs, AUX and the 5 ...

Page 19

... While the internal current source is disabled, the UVOV voltage is solely determined by the ratio of R1 and R2. The input voltage at which the converter turns ON is given by NCP1562A, NCP1562B Equation 1. Once the internal current source is enabled, the absolute value of R1 together with the ratio of R1 and R2 determine the turn OFF threshold as shown in Equation 2 ...

Page 20

... W (typ) and a sink resistance of 2.5 W (typ). The secondary output, OUT2, has a source and a sink resistance (typ). OUT1 is rated at a maximum of 2.0 A and OUT2 is rated at a maximum of NCP1562A, NCP1562B 1 higher drive capability is required, an external driver stage can be easily added as shown in Figure 46. FF ...

Page 21

... Otherwise, the exceed the pulldown current and the oscillator will undefined state. NCP1562A, NCP1562B voltage (V allowing C waveform on the RTCT pin has a sawtooth like shape. OUT2 is set high once V by OUT1 delayed by the overlap delay. Once V is reached, OUT1 goes low, followed by OUT2 delayed by t ...

Page 22

... A diode connected as shown in Figure 50 can be used to permanently set one controller as the master. The diode prevents the master from receiving the SYNC pulse of the slave controller. NCP1562A, NCP1562B MASTER CONTROLLER . The peak voltage Figure 50. Master-Slave Configuration 5 ...

Page 23

... NCP1562A, NCP1562B 5,6,7,8 5,6,7,8 http://onsemi.com 23 Figure 51. Circuit Schematic ...

Page 24

... ORDERING INFORMATION Device NCP1562ADBR2G NCP1562BDBR2G NCP1562ADR2G NCP1562BDR2G †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. NCP1562A, NCP1562B Package Current Limit TSSOP-16 200 mV (Pb-Free) TSSOP-16 500 mV (Pb-Free) SO-16 200 mV ...

Page 25

... K 16X REF 0.10 (0.004) 0.15 (0.006 L PIN 1 IDENT. 1 0.15 (0.006 -V- C 0.10 (0.004) -T- SEATING D PLANE NCP1562A, NCP1562B PACKAGE DIMENSIONS TSSOP-16 DT SUFFIX CASE 948F-01 ISSUE Ç Ç É É Ç Ç É É B SECTION N-N - 0.25 (0.010) ...

Page 26

... SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT:  Literature Distribution Center for ON Semiconductor  P.O. Box 5163, Denver, Colorado 80217 USA  Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada  Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada  Email: orderlit@onsemi.com NCP1562A, NCP1562B PACKAGE DIMENSIONS SO-16 D SUFFIX CASE 751B-05 ISSUE J 9 -B- ...

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