Datasheet

ManualsBrandsPower Integrations ManualsDC / DC Fixed Switching RegulatorsSwitching controller IC DIL-8 (7-PIN)

LNK362-364

LinkSwitch-XT Family

Energy Efﬁ cient, Low Power

Off-Line Switcher IC

Figure 1. Typical Application with LinkSwitch-XT.

Product Highlights

Optimized for Lowest System Cost

• Proprietary IC trimming and transformer construction

techniques enable Clampless™ designs with LNK362

for lower system cost, component count and higher

efﬁ ciency

• Fully integrated auto-restart for short circuit and

open loop protection

• Self-biased supply – saves transformer auxiliary winding

and associated bias supply components

• Frequency jittering greatly reduces EMI

• Meets HV creepage requirements between DRAIN and

all other pins both on the PCB and at the package

• Lowest component count switcher solution

Features Superior to Linear/RCC

• Accurate hysteretic thermal shutdown protection –

automatic recovery improves ﬁ eld reliability

• Universal input range allows worldwide operation

• Simple ON/OFF control, no loop compensation needed

• Eliminates bias winding – simpler, lower cost

transformer

• Very low component count – higher reliability and single

side printed circuit board

• Auto-restart reduces delivered power by 95% during

short circuit and open loop fault conditions

• High bandwidth provides fast turn on with no overshoot

and excellent transient load response

EcoSmart

– Extremely Energy Efﬁ cient

• Easily meets all global energy efﬁ ciency regulations with

no added components

• No-load consumption <300 mW without bias winding at

265 VAC input (<50 mW with bias winding)

• ON/OFF control provides constant efﬁ ciency to very

light loads – ideal for mandatory CEC regulations

Applications

• Chargers/adapters for cell/cordless phones, PDAs, digital

cameras, MP3/portable audio players, and shavers

• Supplies for appliances, industrial systems, and metering

Description

LinkSwitch-XT incorporates a 700 V power MOSFET, oscillator,

simple ON/OFF control scheme, a high voltage switched current

source, frequency jittering, cycle-by-cycle current limit and

Table 1. Notes: 1. Minimum continuous power in a typical non-

ventilated enclosed adapter measured at 50 °C ambient. 2. Minimum

practical continuous power in an open frame design with adequate

heat sinking, measured at 50 °C ambient. 3. Packages: P: DIP-8B,

G: SMD-8B. Please see Part Ordering Information. 4. See Key

Application Considerations section for complete description of

assumptions.

thermal shutdown circuitry onto a monolithic IC. The start-up

and operating power are derived directly from the DRAIN

pin, eliminating the need for a bias winding and associated

circuitry.

December 2005

OUTPUT POWER TABLE

(4)

PRODUCT

(3)

230 VAC ±15% 85-265 VAC

Adapter

(1)

Open

Frame

(2)

Adapter

(1)

Open

Frame

(2)

LNK362P or G 2.8 W 2.8 W 2.6 W 2.6 W

LNK363P or G 5 W 7.5 W 3.7 W 4.7 W

LNK364P or G 5.5 W 9 W 4 W 6 W

Output

Wide Range

HV DC Input

LNK362

PI-4086-081005

LinkSwitch-XT

Output

Wide Range

HV DC Input

LNK363-364

PI-4061-081005

LinkSwitch-XT

a) Clampless ﬂ yback converter with LNK362

b) Flyback converter with LNK363/4

Summary of content (16 pages)

PAGE 1
LNK362-364 LinkSwitch-XT Family ® Energy Efficient, Low Power Off-Line Switcher IC Product Highlights Optimized for Lowest System Cost • Proprietary IC trimming and transformer construction techniques enable Clampless™ designs with LNK362 for lower system cost, component count and higher efficiency • Fully integrated auto-restart for short circuit and open loop protection • Self-biased supply – saves transformer auxiliary winding and associated bias supply components • Frequency jittering greatly reduces
PAGE 2
LNK362-364 DRAIN (D) BYPASS (BP) REGULATOR 5.8 V FAULT PRESENT AUTORESTART COUNTER CLOCK RESET + 5.8 V 4.8 V BYPASS PIN UNDER-VOLTAGE - CURRENT LIMIT COMPARATOR 6.3 V + VI - LIMIT JITTER CLOCK DCMAX OSCILLATOR FEEDBACK (FB) THERMAL SHUTDOWN VFB -VTH S Q R Q LEADING EDGE BLANKING SOURCE (S) PI-4232-110205 Figure 2. Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: Power MOSFET drain connection.
PAGE 3
LNK362-364 LinkSwitch-XT combines a high voltage power MOSFET switch with a power supply controller in one device. Unlike conventional PWM (pulse width modulator) controllers, a simple ON/OFF control regulates the output voltage. The controller consists of an oscillator, feedback (sense and logic) circuit, 5.8 V regulator, BYPASS pin under-voltage circuit, over-temperature protection, frequency jittering, current limit circuit, and leading edge blanking integrated with a 700 V power MOSFET.
PAGE 4
LNK362-364 CY1 100 pF 250 VAC L1 1 mH T1 EE16 9 4 5 J1 D2 1N4005 R1 3.9 k 1/8 W C1 3.3 µF 400 V 85-265 VRMS R2 390 Ω 1/8 W D LinkSwitch-XT U1 LNK362P D4 1N4005 U2 PC817A FB R3 1k 1/8 W BP S L2 1 mH J4 VR1 BZX79B5V1 5.1 V, 2% C2 3.3 µF 400 V J2 D3 1N4005 J3 8 NC NC D1 1N4005 6.2 V, 322 mA D5 1N4934 3 RF1 8.2 Ω 2.5 W C4 330 µF 16 V C3 100 nF 50 V PI-4162-110205 Figure 5. 2 W Universal Input CV Adapter Using LNK362.
PAGE 5
LNK362-364 The LinkSwitch-XT is completely self-powered from the DRAIN pin, requiring only a small ceramic capacitor C3 connected to the BYPASS pin. No auxiliary winding on the transformer is required. Key Application Considerations LinkSwitch-XT Design Considerations Output Power Table The data sheet maximum output power table (Table 1) represents the maximum practical continuous output power level that can be obtained under the following assumed conditions: 1.
PAGE 6
LNK362-364 Input Filter Capacitor TOP VIEW Y1Capacitor FB T r a n s f o r m e r S LinkSwitch-XT D S BP S - HV DC + INPUT S S S CBP Optocoupler + DC OUT - Maximize hatched copper areas ( ) for optimum heatsinking Output Filter Capacitor PI-4155-102705 Figure 6. Recommended Printed Circuit Layout for LinkSwitch-XT in a Flyback Converter Configuration. LinkSwitch-XT Layout Considerations See Figure 6 for a recommended circuit board layout for LinkSwitch-XT.
PAGE 7
LNK362-364 Optocoupler Place the optocoupler physically close to the LinkSwitch-XT to minimize the primary-side trace lengths. Keep the high current, high voltage drain and clamp traces away from the optocoupler to prevent noise pick up. Output Diode For best performance, the area of the loop connecting the secondary winding, the output diode and the output filter capacitor should be minimized.
PAGE 8
LNK362-364 ABSOLUTE MAXIMUM RATINGS(1,5) DRAIN Voltage .................................. .............-0.3 V to 700 V Peak DRAIN Current: LNK362................200 mA (375 mA)(2) LNK363/364.........400 mA (750 mA)(2) FEEDBACK Voltage ...........................................-0.3 V to 9 V FEEDBACK Current ...................................................100 mA BYPASS Voltage.................................................. -0.3 V to 9 V Storage Temperature .....................................
PAGE 9
LNK362-364 Conditions Parameter Symbol SOURCE = 0 V; TJ = -40 to 125 °C See Figure 7 (Unless Otherwise Speciﬁed) Min Typ Max Units CONTROL FUNCTIONS (cont) BYPASS Pin Supply Current IBPSC See Note D µA 68 CIRCUIT PROTECTION Current Limit Power Coefﬁcient ILIMIT (See Note E) I2f Leading Edge Blanking Time tLEB Current Limit Delay tILD Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis TSHD di/dt = 30 mA/µs TJ = 25 °C LNK362 130 140 150 di/dt = 42 mA/µs TJ = 25 °C LNK3
PAGE 10
LNK362-364 Conditions Parameter Symbol SOURCE = 0 V; TJ = -40 to 125 °C See Figure 7 (Unless Otherwise Speciﬁed) Min Typ Max Units OUTPUT (cont) Breakdown Voltage VBP = 6.2 V, VFB 2 V, See Note H, TJ = 25 °C BVDSS DRAIN Supply Voltage Output Enable Delay tEN Output Disable Setup Time tDST Auto-Restart ON-Time tAR Auto-Restart Duty Cycle 700 V 50 V See Figure 9 10 0.5 TJ = 25 °C See Note I DCAR LNK362 40 LNK363-364 45 5 µs µs ms % NOTES: A.
PAGE 11
LNK362-364 470 Ω 5W 470 kΩ D S1 FB S2 BP 50 V S S S S 50 V 0.1 µF PI-3490-060204 Figure 7. LinkSwitch-XT General Test Circuit. DCMAX t2 (internal signal) t1 tP HV 90% 90% FB DRAIN VOLTAGE t D= 1 t2 VDRAIN tEN 10% 0V tP = 1 fOSC PI-3707-112503 PI-2048-033001 Figure 8. LinkSwitch-XT Duty Cycle Measurement. Figure 9. LinkSwitch-XT Output Enable Timing.
PAGE 12
LNK362-364 Typical Performance Characteristics 1.0 PI-2680-012301 1.2 Output Frequency (Normalized to 25 °C) PI-2213-012301 1.0 0.8 0.6 0.4 0.2 0 0.9 -50 -25 0 25 50 -50 75 100 125 150 -25 Junction Temperature (°C) 1.0 0.8 0.6 0.4 0.2 50 100 100 125 PI-4092-081505 1.2 1.0 0.8 Normalized di/dt = 1 TBD LNK362 30 mA/µs LNK363 42 mA/µs LNK364 50 mA/µs 0.6 0.4 Normalized Current Limit = 1 140 mA 210 mA 250 mA 0.2 150 Temperature (°C) Figure 12. Current Limit vs. Temperature.
PAGE 13
LNK362-364 Typical Performance Characteristics (cont.) PI-4094-081605 Drain Capacitance (pF) 1000 100 Scaling Factors: LNK362 0.5 LNK363 0.8 LNK364 1.0 10 1 0 100 200 300 400 500 600 Drain Voltage (V) Figure 16. COSS vs. Drain Voltage.
PAGE 14
LNK362-364 DIP-8B ⊕ D S .004 (.10) -E- Notes: 1. Package dimensions conform to JEDEC specification MS-001-AB (Issue B 7/85) for standard dual-in-line (DIP) package with .300 inch row spacing. 2. Controlling dimensions are inches. Millimeter sizes are shown in parentheses. 3. Dimensions shown do not include mold flash or other protrusions. Mold flash or protrusions shall not exceed .006 (.15) on any side. 4. Pin locations start with Pin 1, and continue counter-clockwise to Pin 8 when viewed from the top.
PAGE 15
LNK362-364 C 12/05 15
PAGE 16
LNK362-364 Revision Notes Date B 1) Released Final Data Sheet. 11/05 C 1) Corrected Application Example section. 12/05 For the latest updates, visit our website: www.powerint.com Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein.