FAN6602R

FAN6602R ONSEMI | Alldatasheet

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© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6602R • Rev. 1.0 FAN6602R — Highly Integrated Green-Mode PWM Controller FAN6602R Highly Integrated Green-Mode PWM Controller

Features

 Low Startup Current: 8 µA  Low Standby Power: Under 0.1 W  Low Operating Current in Green Mode: 600 µA  PWM Frequency Continuously Decreasing with Cycle Skipping and Burst Mode at Light Loads  Fixed PWM Frequency (65 kHz) with Frequency Hopping  Full Range Frequency Hopping  Peak-Current Mode Operation with Cycle-by-Cycle Current Limiting  Constant Output Power Limit (Full AC Input Range)  VDD Over-Voltage Protection (OVP)  Feedback Open-Loop Protection: 60 ms Delay  Internal OTP Sensor with Hysteresis  Gate Output Maximum Voltage Clamp: 13.5 V  Gate Driving Capability: 400 mA  Soft-Start Time: 6 ms  Soft Driving for EMI Improvement

Applications

General-purpose switched-mode power supplies and flyback power converters, including:  Power Adapters  Open-Frame SMPS  SMPS with Surge-Current Output, such as for Printers, Scanners, Motor Drivers

Description

A highly integrated PWM controller, FAN6602R provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary Green Mode provides off -time modulation to continuously decrease the switching frequency under light-load conditions. Under zero -load conditions, the power supply enters Burst Mode, which completely shuts off PWM ou tput. Output restarts just before the supply voltage drops below the Under-Voltage Lockout (UVLO) lower limit. Green Mode enables power supplies to meet international power conservation requirements. The FAN6602R is designed for SMPS and integrates a frequency-hopping function that helps to reduce EMI emission of a power supply with minimum line filters. To compensate the power limit variation over universal input range, a current limit (V LIMIT) adaptively keeps the power limit substantially constant. The gate output is clamped at 13.5 V to protect the external MOSFET from over-voltage damage. Other protection functions include V DD Over-Voltage Protection (OVP), and Over-Temperature Protection (OTP). For OTP, an external NTC thermistor can be applied to sense the ambient temperature. Protection types are shown in Table 1. Table 1. Protection Type

Ordering Information

Temperature Range Package Packing Method FAN6602RM6X -40 to +105°C 6-Lead, SOT23, JEDEC MO-178 Variation AB, 1.6 mm Wide Tape & Reel

Figure 3. Top Mark Figure 4. Pin Configuration

2 FB Feedback

trigger level and persists at that level, the controller stops and restarts.

3 RT Temperature

pin drops below the threshold, PWM output is disabled.

4 SENSE Current Sense

5 VDD Power Supply Power supply. 6 GATE Driver Output The totem-pole output driver for driving the power MOSFET.

© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6602R • Rev. 1.0 4 FAN6602R — Highly Integrated Green-Mode PWM Controller Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. All voltage values, except differential voltage s, are given with respect to GND pin. Symbol Parameter Min. Max. Unit VDD Supply Voltage 30 V VL Input Voltage to FB, SENSE, and RT Pins -0.3 7.0 V PD Power Dissipation at TA<50°C 400 mW RΘJA Thermal Resistance (Junction-to-Ambient) 244 °C/W TJ Operating Junction Temperature -40 +150 °C TSTG Storage Temperature Range -55 +150 °C TL Lead Temperature, Wave Soldering, 10 Seconds +260 °C ESD Capability Symbol Parameter Value Unit ESD Human Body Model, EIA/JESD22-A114 6.0 kV Charge Device Model, JESD22-C101 2.0 kV Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Min. Max. Unit TA Operating Ambient Temperature -40 +105 °C VDD Supply Voltage 25 V VL Input Voltage to FB, SENSE, and RT Pins -0.3 6.0 V TJ Operating Junction Temperature -40 +125 °C

© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6602R • Rev. 1.0 5 FAN6602R — Highly Integrated Green-Mode PWM Controller

Electrical Characteristics

VDD = 7.5 ~ 20 V and TA = -40 ~ 105°C, unless otherwise noted. Symbol Parameter Condition Min. Typ. Max. Unit VDD Section VDD-OP Continuously Operating Voltage 20 V VDD-ON Turn-On Threshold Voltage 15 16 17 V VDD-OFF Turn-Off Threshold Voltage 6.5 7.0 7.5 V IDD-ST Startup Current VDD-ON – 0.16 V 8 15 µA IDD-OP1 Operating Supply Current in PWM Operation VDD = 20 V, VFB = 3 V, Gate Open 2 mA IDD-OP2 Operating Supply Current when VFB < VFB-ZDC VDD = 15 V, VFB < VFB-ZDC 600 µA VDD-OVP VDD Over-Voltage Protection TA = 25°C 21.0 22.5 24.0 V tD-VDDOVP VDD OVP Debounce Time 50 70 µs Feedback Input Section AV Input-Voltage to Current-Sense Attenuation 1/4.0 1/3.5 1/3.0 V/V ZFB Input Impedance TA = 25°C 17 kΩ VFB-OPEN FB Pin Open Voltage 5.2 5.4 5.6 V VFB-OLP Threshold Voltage for Open-Loop Protection TA = 25°C 4.3 4.6 5.0 V tD-OLP Open-Loop Protection Delay VFB > VFB-OLP, tON > 2.5 µs, 54 60 66 ms tD-SCP Secondary Short-Circuit Protection Delay VFB > VFB-OLP, tON < 2.5 µs, 6 7 8 ms tON-SCP Short-Circuit Protection On-Time Detection VFB > VFB-OLP, 2.9 µs Current Sense Section tPD Delay to Output 100 250 ns tLEB Leading-Edge Blanking Time 180 245 310 ns VSTHFL Flat Threshold Voltage for Current Limit Duty > 55% 0.57 0.60 0.63 V VSTHVA Valley Threshold Voltage for Current Limit Duty = 0% 0.36 0.39 0.42 V tSOFT-START Period During Startup Time Startup Time 4.00 6.00 9.00 ms Continued on the following page…

VDD = 7.5 ~ 20 V and TA = -40 ~ 105°C, unless otherwise noted. Figure 5. PWM Frequency

© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6602R • Rev. 1.0 7 FAN6602R — Highly Integrated Green-Mode PWM Controller Electrical Characteristics (Continued) VDD = 7.5 ~ 20 V and TA = -40 ~ 105°C, unless otherwise noted. Symbol Parameter Condition Min. Typ. Max. Unit PWM Output Section DCYMAX Maximum Duty Cycle 68 75 85 % VOL Output Voltage Low VDD = 15 V, IO = 50 mA 1.5 V VOH Output Voltage High VDD = 8 V, IO = 50 mA 6 V tR Rising Time (with Soft Driving) Gate = 1 nF 150 200 ns tF Falling Time Gate = 1 nF 35 80 ns VCLAMP Gate Output Clamping Voltage VDD = 20 V 12.0 13.5 15.0 V IO-SOURCE Gate Source Driving Capability(1) VDD = 15 V 400 mA IO-SINK Gate Sink Driving Capability(1) VDD = 15 V 400 mA Over-Temperature Protection (OTP) Section RRT Maximum External Resistance of RT Pin to Trigger Protection TA = 25°C 9 10 11 kΩ VOTP Threshold Voltage for Over-Temperature Protection 0.94 1.03 1.09 V IRT Output Current of RT Pin TA = 25°C 92 100 108 μA tDOTP Over-Temperature Debounce Time VFB = VFB-N 13.5 17.0 20.5 ms VOTP2 Second Threshold Voltage for Over- Temperature Protection 0.65 0.72 0.78 V tDOTP2 Second Over-Temperature Debounce Time 50 125 200 µs TOTP Protection Junction Temperature(1,2) +135 °C TRestart Restart Junction Temperature (1,3) TOTP- 25 °C Notes: 1. Guarantee by design. 2. When activated, the output is disabled. 3. The threshold temperature for enabling the output again and resetting the after OTP has been activated.

startup resistor is typically connected to AC line. Figure 22. Startup Circuit reducing switching loss in Standby Mode. Figure 23. PWM Frequency cannot switch off the gate driver.

13.5 V Zener diode to protect power MOSFET

driving circuit is implemented to minimize EMI. stability and prevents sub-harmonic oscillation. at every switching cycle as slope compensation.

© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6602R • Rev. 1.0 12 FAN6602R — Highly Integrated Green-Mode PWM Controller Protections Self-protective functions include VDD Over-Voltage Protection (OVP) , Open-Loop / Overload Protection (OLP), Over -Current Protection (OCP), Short-Circuit Protection (SCP) and Over-Temperature Protection (OTP). All the self-protective functions are Auto-Restart (AR) Mode protections Auto-Restart (AR) Mode Protection Once a fault condition is detected, switching is terminated and the MOSFET remain s off. This causes VDD to fall because no more power is delivered from auxiliary winding. When V DD falls to VDD-OFF (7 V), the protection is reset and the operating current reduces to startup current, which causes V DD to rise . FAN6602R resumes normal operation when VDD reaches VDD-ON (16 V). In this manner, the auto -restart c an alternately enable and disable the switching of the MOSFET until the fault condition is eliminated. Over-Current Protection (OCP) FAN6602R over-current protection is a pulse-by-pulse bias current limit threshold (VSTHVA and VSTHFL) that turns off the MOSFET once the sensing voltage of MOSFET drain current reaches the threshold. The current limit compensates the power-limit variation over the universal input range and adaptively keeps the power limit substantially constant. Open-Loop / Overload Protection (OLP) When the upper branch of the voltage divider for the shunt regulator is broken, no current flows through the photo-coupler transistor, which pull s up the feedback voltage to 5.4 V. When feedback voltage is above 4.6 V for longer than 60 ms, OLP is triggered. This protection is also triggered when the SMPS output drops below the nominal value for longer than 60 ms due to the overload condition. If the secondary output -short situation occurs when the feedback voltage is above 4.6 V, protection time is 7 ms for shorter debounce time. VDD Over-Voltage Protection (OVP) VDD over-voltage protection prevents IC damage caused by over-voltage on the VDD pin. Once the VDD voltage is over the over -voltage protection voltage (VDD-OVP), and lasts for t D-VDDOVP, the PWM pulses are disable d. A debounce time (typically 50 µs) prevents false triggering by switching noise. Over-Temperature Protection (OTP) The OTP circuit is composed of current source and voltage comparators. Typically , an NTC thermistor is connected between the RT and GND pins. If the voltage of th is pin drops below a threshold of 1.03 V, PWM output is disabled after t DOTP debounce time. If this pin voltage drops below 0.7 2 V, it triggers the protection immediately after tDOTP2 debounce time.

Figure 25. Transformer

Figure 26. 6-Lead, SOT23, JEDEC MO-178 Variation AB, 1.6 mm Wide B. ALL DIMENSIONS ARE IN MILLIMETERS.

0.60 REF

1.45 MAX

0.15 C A-B

0.15 C D

0.20 C A-B D

© 2014 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6602R • Rev. 1.0 16 FAN6602R — Highly Integrated Green-Mode PWM Controller

SEE DETAIL AGAGE PLANE0.251.10 MAX0.200.08 CABC0.20M0.10 ABH CC

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