CS5106 Cherry Semiconductor Corporation, CS5106 Datasheet

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CS5106

Manufacturer Part Number
CS5106
Description
Multi-Feature/ Synchronous plus Auxiliary PWM Controller
Manufacturer
Cherry Semiconductor Corporation
Datasheet
48V to 3.3V Forward Converter with Synchronous Rectifiers
Rev. 10/27/98
R27
R3
The CS5106 is a fixed frequency,
current mode controller with one
single NFET driver and one dual
FET, synchronous driver. The syn-
chronous driver allows for
increased efficiency of the main iso-
lated power stage and the single
driver allows the designer to devel-
op auxiliary supplies for controller
power as well as secondary side
house keeping. In addition,
because the synchronous drivers
have programmable FET non-over-
lap, the CS5106 is an ideal con-
troller for soft-switched converter
topologies.
The CS5106 is specifically designed
for isolated topologies where speed,
flexibility, reduced size and
Multi-Feature, Synchronous plus Auxiliary
V
R2
R1
C4
IN
C5
V
AUXS
D1
C2
C1
D2
V
AUXP
ENABLE
C7
SYNC
R5
T1
R4
V
IN
R6
IN
Q1
C3
V
R8
D6
IN
Q2
GATE1
OVSD
V
OAM
OA
OUVDELAY
I
RAMP1
V
V
V
UVSD
LIM1
5REF
FB1
SS
CC
OUT
CS5106
D3
C9
Applications Diagram
PROGRAM
SYNC
Description
ENABLE
SYNC
DLYSET
GATE2B
RAMP2
GATE2
FADJ
V
I
LIM2
V
OUT
FB2
C10
DD
IN
R9
R10
R12
R11
R24
R25
SYNC
R13
PWM Controller
C8
D4
reduced component count are
requirements. The controller con-
tains the following features:
Undervoltage Shutdown,
Overvoltage Shutdown,
Programmable Frequency,
Programmable Synchronous Non-
Overlap Time, Master/Slave
Clocking with Frequency Range
Detection, Enable, Output
Undervoltage Protection with
Timer, 20mA 5V Output, 80ns
PWM propagation delay, and
Controlled Hiccup Mode.
The CS5106 has junction tempera-
ture and supply ranges of -40ûC to
125ûC and 9V to 16V respectively
and is available in the 24 lead SSOP
package.
OUT
D8
C6
T4
R14
V
IN
V
R7
R26
AUXP
R15
D5
CS5106
T3
CNY17-4
R20
R23
V
AUXS
D7
R22
TL431
R16
C11
Q7
Q6
V
1
5REF
T2
Q3
C14
R21
Q4
C13
R17
Q5
R19
R18
L1
C12
V
MAIN
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Cherry Semiconductor Corporation
Web Site: www.cherry-semi.com
OUVDELAY
Programmable Fixed
Frequency
Programmable FET Non-
overlap
Enable Lead
12V Fixed Auxiliary
Supply Control
Under and Overvoltage
Shutdown
Output Undervoltage
Protection with Timer
Master/Slave Clock
Syncing Capability
Sync Frequency Range
Detection
80ns PWM Propagation
Delay
20mA 5V Reference
Output
Small 24 lead SSOP
Package
Controlled Hiccup Mode
Email: info@cherry-semi.com
Package Options
OAOUT
RAMP1
GATE1
UVSD
OVSD
V
OAM
I LIM1
V
5REF
V
V
FB1
CC
SS
Features
24 Lead SSOP
1
A
ENABLE
PROGRAM
SYNC
SYNC
FADJ
DLYSET
RAMP2
V
I
V
GATE2
GATE2B
LIM2
¨
FB2
DD
Company
IN
OUT

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CS5106 Summary of contents

Page 1

... In addition, because the synchronous drivers have programmable FET non-over- lap, the CS5106 is an ideal con- troller for soft-switched converter topologies. The CS5106 is specifically designed for isolated topologies where speed, flexibility, reduced size and Applications Diagram 48V to 3 ...

Page 2

Operating Junction Temperature, T Operating Temperature Range Storage Temperature Range, T ...................................................................................................................................-65 to 150¡C S ESD (Human Body Model).........................................................................................................................................................2kV Lead Temperature Soldering: Reflow (SMD styles only).............................................60 sec. max above 183¡C, 230¡C peak Lead Symbol Lead Name UVSD Undervoltage ...

Page 3

Electrical Characteristics -40¡C to 125¡ wise specified. For All Specs: UVSD=6V, OVSD = 0V, ENABLE = 0V, I PARAMETER V Supply Current SS Low V Supply Current DIODE SS CC Diode ON ...

Page 4

Electrical Characteristics -40¡C to 125¡ wise specified. For All Specs: UVSD=6V, OVSD = 0V, ENABLE = 0V, I PARAMETER Bias Supply Error Amplifier: continued Output Low Sink Current V Set Point SS Large Signal Gain Unity ...

Page 5

Electrical Characteristics -40¡C to 125¡ wise specified. For All Specs: UVSD=6V, OVSD = 0V, ENABLE = 0V, I PARAMETER Current Limit Circuits I Current Limit Threshold LIM1 Voltage I Short Circuit Threshold LIM1 Voltage I Input ...

Page 6

Electrical Characteristics -40¡C to 125¡ wise specified. For All Specs: UVSD=6V, OVSD = 0V, ENABLE = 0V, I PARAMETER GATE 2, 2B Non-Overlap Delay GATE2 Turn-on Delay from GATE2B GATE2B Turn-on Delay from GATE2 GATE 1, ...

Page 7

PACKAGE LEAD # LEAD SYMBOL 9 V FB1 GATE1 13 Gnd 14 GATE2 15 GATE2B 16 V FB2 17 RAMP2 18 I LIM2 19 DLYSET 20 FADJ 21 SYNC OUT 22 SYNC IN ...

Page 8

... The internal logic monitors the supply voltage During abnormal operating conditions, all GATE CC drivers are held in a low state. The CS5106 requires 1.5mA nominal of startup current. Startup Assume the part is enabled and there are no over voltage or under voltage faults present. Also, assume that all auxil- iary and main regulated output voltages start at 0V ...

Page 9

,RUN1 REF REF(OK) CLK1 GATE1 V FB1 RAMP1 V > RUN2 CLK2 GATE2 GATE2B V FB2 RAMP2 Figure 1: Startup waveforms. Voltage and Current Ramp PWM Comparator Inputs (V , ...

Page 10

FADJ and DLYSET Leads Amplifier A2 and transistor N3 create a current source fol- lower whose output is FADJ. An external resistor from FADJ to ground completes the loop. The voltage across the resistor is set by a buffered, trimmed, ...

Page 11

The equivalent down slope at the current sense resistor for this application circuit is: NS Slope @ R12 = Inductor_Slope ´ NP After choosing R9 and C9 to generate a ramp with a time constant of about 5 times the ...

Page 12

... Lead SSOP 8.50 5.60 (.220) 5.00 (.197) 0.20 (.008) See 0.09 (.004) DETAIL A Parting Line 1.03 (.041) 0.77 (.030) REF: JEDEC MO-150 Ordering Information Part Number Description CS5106LSW24 24 Lead SSOP CS5106LSWR24 24 Lead SSOP (tape & reel) Rev. 10/27/98 Package Specification D Thermal Data English R QJC Min Max Min R QJA 7.90 .335 .311 SSOP (SW) ...

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