JBL SCS 200 (serv.man10) Service Manual ▷ View online
Product Brief
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-A
Ordering Information Example
Package
Temperature
Range
Voltage Tol-
erance
Part Number
Marking ID
Packing Type
Tin Lead
Lead Free
Tin Lead
Lead Free
SOT-23-5
-40 to
125
o
C
0.4%
AZ431AK-ATR
AZ431AK-ATRE1
K3A
E3A
Tape & Reel
0.8%
AZ431BK-ATR
AZ431BK-ATRE1
K3B
E3B
Tape & Reel
TO-92
-40 to
125
o
C
0.4%
AZ431AZ-A
AZ431AZ-AE1
AZ431AZ-A
AZ431AZ-AE1
Bulk
0.4%
AZ431AZ-ATR
AZ431AZ-ATRE1
AZ431AZ-A
AZ431AZ-AE1
Ammo
0.8%
AZ431BZ-A
AZ431BZ-AE1
AZ431BZ-A
AZ431BZ-AE1
Bulk
0.8%
AZ431BZ-ATR
AZ431BZ-ATRE1
AZ431BZ-A
AZ431BZ-AE1
Ammo
Detailed information please refer to the relevant datasheet.
Sales Office:
USA
3170 De La Cruz Blvd, Suite # 105 Santa Clara, CA 95054-2411,
U.S.A
Tel : +1-408-988 6388
Fax : +1-408-988 6386
3170 De La Cruz Blvd, Suite # 105 Santa Clara, CA 95054-2411,
U.S.A
Tel : +1-408-988 6388
Fax : +1-408-988 6386
Taiwan
4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel : 886-2-2656-2808
Fax : 886-2-2656-2806
4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel : 886-2-2656-2808
Fax : 886-2-2656-2806
Shanghai
8F, B Zone, 900 Yi Shan Road, Shanghai 200233,
China
Tel : 86-21-6495 9539
Fax : 86-21-6485 9673
Shenzhen
Room 27B, Tower C, No. 2070, Shennanzhong Road, Shenzhen
518031, China
Tel : 86-755-8368 3987
Room 27B, Tower C, No. 2070, Shennanzhong Road, Shenzhen
518031, China
Tel : 86-755-8368 3987
Fax : 86-755-8368 3166
Nov. 2004
BCD Semiconductor Manufacturing Limited
Pin Configuration
Circuit Type
Bandgap Tolerance
B: 0.8%
A: 0.4%
E1: Lead-Free
Blank: Tin Lead
Blank: Tin Lead
A Z 431 -
A: AZ431(40V)
B: AZ431(20V)
Package
M: SOIC-8 Z: TO-92
N: SOT-23-3 K:SOT-23-5
M: SOIC-8 Z: TO-92
N: SOT-23-3 K:SOT-23-5
R: SOT-89
TR: Tape/Reel or Ammo
Blank: Tube or Bulk
Blank: Tube or Bulk
SOIC-8
REF
ANODE
NC
CATHODE
NC
1
2
3
4
5
6
7
8
ANODE
ANODE
ANODE
TO-92
SOT-23-5
NC
CATHODE
ANODE
REF
3
2
1
4
5
NC
4
CATHODE
ANODE
REF
1
2
3
JBL
SCS200.5/230 Service Manual
Page 33 of 53
TNY274-280
TinySwitch-III
Family
Energy Efficient, Off-Line Switcher with
Enhanced Flexibility and Extended Power Range
Figure 1. Typical Standby Application.
Product Highlights
Lowest System Cost with Enhanced Flexibility
• Simple ON/OFF control, no loop compensation needed
• Selectable current limit through BP/M capacitor value
- Higher current limit extends peak power or, in open
frame applications, maximum continuous power
- Lower current limit improves efficiency in enclosed
adapters/chargers
- Allows optimum TinySwitch-III choice by swapping
devices with no other circuit redesign
• Tight I
2
f parameter tolerance reduces system cost
- Maximizes MOSFET and magnetics power delivery
- Minimizes max overload power, reducing cost of
transformer, primary clamp & secondary components
• ON-time extension – extends low line regulation range/
hold-up time to reduce input bulk capacitance
• Self-biased: no bias winding or bias components
• Frequency jittering reduces EMI filter costs
• Pin-out simplifies heatsinking to the PCB
• SOURCE pins are electrically quiet for low EMI
Enhanced Safety and Reliability Features
Enhanced Safety and Reliability Features
• Accurate hysteretic thermal shutdown protection with
automatic recovery eliminates need for manual reset
• Improved auto-restart delivers <3% of maximum power
in short circuit and open loop fault conditions
• Output overvoltage shutdown with optional Zener
• Line under-voltage detect threshold set using a single
optional resistor
• Very low component count enhances reliability and
enables single-sided printed circuit board layout
• High bandwidth provides fast turn on with no overshoot
and excellent transient load response
• Extended creepage between DRAIN and all other pins
improves field reliability
EcoSmart
®
– Extremely Energy Efficient
• Easily meets all global energy efficiency regulations
• No-load <150 mW at 265 VAC without bias winding,
<50 mW with bias winding
• ON/OFF control provides constant efficiency down to
very light loads – ideal for mandatory CEC regulations
and 1 W PC standby requirements
Applications
• Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
®
February 2006
Table 1. Notes: 1. Minimum continuous power in a typical non-
ventilated enclosed adapter measured at 50 °C ambient. Use of an
external heatsink will increase power capability 2. Minimum peak
power capability in any design or minimum continuous power in an
open frame design (see Key Application Considerations). 3. Packages:
P: DIP-8C, G: SMD-8C. See Part Ordering Information.
• PC Standby and other auxiliary supplies
• DVD/PVR and other low power set top decoders
• Supplies for appliances, industrial systems, metering, etc.
Description
TinySwitch-III incorporates a 700 V power MOSFET, oscillator,
high voltage switched current source, current limit (user
selectable) and thermal shutdown circuitry. The IC family uses
an ON/OFF control scheme and offers a design flexible solution
with a low system cost and extended power capability.
OUTPUT POWER TABLE
PRODUCT
3
230 VAC ±15%
85-265 VAC
Adapter
1
Peak or
Open
Frame
2
Adapter
1
Peak or
Open
Frame
2
TNY274 P or G
6 W
11 W
5 W
8.5 W
TNY275 P or G 8.5 W
15 W
6 W
11.5 W
TNY276 P or G 10 W
19 W
7 W
15 W
TNY277 P or G 13 W
23.5 W
8 W
18 W
TNY278 P or G 16 W
28 W
10 W
21.5 W
TNY279 P or G 18 W
32 W
12 W
25 W
TNY280 P or G 20 W
36.5 W
14 W
28.5 W
PI-4095-082205
Wide-Range
HV DC Input
D
S
EN/UV
BP/M
+
-
+
-
DC
Output
TinySwitch-III
JBL
SCS200.5/230 Service Manual
Page 34 of 53
2
E
2/06
2/06
TNY274-280
Figure 2. Functional Block Diagram.
Figure 3. Pin Configuration.
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides
internal operating current for both start-up and steady-state
operation.
BYPASS/MULTI-FUNCTION (BP/M) Pin:
This pin has multiple functions:
1. It is the connection point for an external bypass capacitor
for the internally generated 5.85 V supply.
2. It is a mode selector for the current limit value, depending
on the value of the capacitance added. Use of a 0.1 µF
capacitor results in the standard current limit value. Use of
a 1 µF capacitor results in the current limit being reduced to
that of the next smaller device size. Use of a 10 µF capacitor
results in the current limit being increased to that of the next
larger device size for TNY275-280.
3. It provides a shutdown function. When the current into the
bypass pin exceeds 5.5 mA, the device latches off until the
BP/M voltage drops below 4.9 V, during a power down.
This can be used to provide an output overvoltage function
with a Zener connected from the BP/M pin to a bias winding
supply.
ENABLE/UNDER-VOLTAGE (EN/UV) Pin:
This pin has dual functions: enable input and line under-voltage
sense. During normal operation, switching of the power
PI-4077-013106
CLOCK
OSCILLATOR
5.85 V
4.9 V
SOURCE
(S)
S
R
Q
DCMAX
BYPASS/
MULTI-FUNCTION
(BP/M)
+
-
V
ILIMIT
FAULT
PRESENT
CURRENT LIMIT
COMPARATOR
ENABLE
LEADING
EDGE
BLANKING
THERMAL
SHUTDOWN
+
-
DRAIN
(D)
REGULATOR
5.85 V
BYPASS PIN
UNDER-VOLTAGE
1.0 V + V
T
ENABLE/
UNDER-
VOLTAGE
(EN/UV)
Q
115
µA
25
µA
LINE UNDER-VOLTAGE
RESET
AUTO-
RESTART
COUNTER
JITTER
1.0 V
6.4 V
CURRENT
LIMIT STATE
MACHINE
PI-4078-080905
D
S
BP/M
S
S
EN/UV
P Package (DIP-8C)
G Package (SMD-8C)
8
5
7
1
4
2
S
6
JBL
SCS200.5/230 Service Manual
Page 35 of 53
3
TNY274-280
E
2/06
Figure 4. Frequency Jitter.
MOSFET is controlled by this pin. MOSFET switching is
terminated when a current greater than a threshold current is
drawn from this pin. Switching resumes when the current being
pulled from the pin drops to less than a threshold current. A
modulation of the threshold current reduces group pulsing. The
threshold current is between 60 µA and 115 µA.
The EN/UV pin also senses line under-voltage conditions through
an external resistor connected to the DC line voltage. If there is
no external resistor connected to this pin, TinySwitch-III detects
its absence and disables the line under-voltage function.
SOURCE (S) Pin:
This pin is internally connected to the output MOSFET source
for high voltage power return and control circuit common.
TinySwitch-III
Functional
Description
TinySwitch-III combines a high voltage power MOSFET switch
with a power supply controller in one device. Unlike conventional
PWM (pulse width modulator) controllers, it uses a simple
ON/OFF control to regulate the output voltage.
The controller consists of an oscillator, enable circuit (sense and
logic), current limit state machine, 5.85 V regulator, BYPASS/
MULTI-FUNCTION pin under-voltage, overvoltage circuit, and
current limit selection circuitry, over- temperature protection,
current limit circuit, leading edge blanking, and a 700 V power
MOSFET. TinySwitch-III incorporates additional circuitry for
line under-voltage sense, auto-restart, adaptive switching cycle
on-time extension, and frequency jitter. Figure 2 shows the
functional block diagram with the most important features.
Oscillator
The typical oscillator frequency is internally set to an average
of 132 kHz. Two signals are generated from the oscillator: the
maximum duty cycle signal (DC
MAX
) and the clock signal that
indicates the beginning of each cycle.
The oscillator incorporates circuitry that introduces a small
amount of frequency jitter, typically 8 kHz peak-to-peak, to
minimize EMI emission. The modulation rate of the frequency
jitter is set to 1 kHz to optimize EMI reduction for both average
and quasi-peak emissions. The frequency jitter should be
measured with the oscilloscope triggered at the falling edge of
the DRAIN waveform. The waveform in Figure 4 illustrates
the frequency jitter.
Enable Input and Current Limit State Machine
The enable input circuit at the EN/UV pin consists of a low
impedance source follower output set at 1.2 V. The current
through the source follower is limited to 115 µA. When the
current out of this pin exceeds the threshold current, a low
logic level (disable) is generated at the output of the enable
circuit, until the current out of this pin is reduced to less than
the threshold current. This enable circuit output is sampled
at the beginning of each cycle on the rising edge of the clock
signal. If high, the power MOSFET is turned on for that cycle
(enabled). If low, the power MOSFET remains off (disabled).
Since the sampling is done only at the beginning of each cycle,
subsequent changes in the EN/UV pin voltage or current during
the remainder of the cycle are ignored.
The current limit state machine reduces the current limit by
discrete amounts at light loads when TinySwitch-III is likely to
switch in the audible frequency range. The lower current limit
raises the effective switching frequency above the audio range
and reduces the transformer flux density, including the associated
audible noise. The state machine monitors the sequence of
enable events to determine the load condition and adjusts the
current limit level accordingly in discrete amounts.
Under most operating conditions (except when close to no-load),
the low impedance of the source follower keeps the voltage on
the EN/UV pin from going much below 1.2 V in the disabled
state. This improves the response time of the optocoupler that
is usually connected to this pin.
5.85 V Regulator and 6.4 V Shunt Voltage Clamp
The 5.85 V regulator charges the bypass capacitor connected
to the BYPASS pin to 5.85 V by drawing a current from the
voltage on the DRAIN pin whenever the MOSFET is off. The
BYPASS/MULTI-FUNCTION pin is the internal supply voltage
node. When the MOSFET is on, the device operates from the
energy stored in the bypass capacitor. Extremely low power
consumption of the internal circuitry allows TinySwitch-III to
operate continuously from current it takes from the DRAIN
pin. A bypass capacitor value of 0.1 µF is sufficient for both
high frequency decoupling and energy storage.
600
0
5
10
136 kHz
128 kHz
128 kHz
V
DRAIN
Time (
µs)
PI-2741-041901
500
400
300
200
100
0
JBL
SCS200.5/230 Service Manual
Page 36 of 53
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