GR1230RCG

Preliminary GR1230RA-02 Multi-Mode PWM Controller with Integrated Protections Features multi-mode (QR/CCM) PWM controller for flyback  Low Start-Up Current (4us*) 0.80 Maximum input voltage at High Line, VcsmaxL(ON TimeVSMAX Green Mode Frequency 69 21 Jitter Frequency (CCM, Vcomp>Vsmax) 25 kHz 29 kHz ±8 % 8 ms Soft Start Time (CS Pin) Soft Start Time* GATE DRIVER OUTPUT (OUT Pin) Output low level, VCC = 15V, Io = 20mA 1 Output high level, VCC = 15V, Out pin=1.5kΩ to GND 8 Output High Level, VCC=UVLO-OFF+0.2V 7 V V VCC V Rising time, load capacitance = 1000pF* 270 330 390 ns Falling time, load capacitance = 1000pF* 30 45 50 ns VGATE-clamp (VCC = 17V ) 13.5 V 9.79 10.8 12.0 μs OLP trip level, Vcomp 4.2 4.35 4.5 V OLP delay time after start-up 55 69 84 ms Maximum On Time (CCM Fs=70kHz) Open Loop Protection (COMP Pin) Internal OTP (Guaranteed by design) OTP* Hysteresis* 145 ℃ 30 ℃ *Guaranteed by Design. 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 6 Preliminary GR1230RA-02 Typical Performance Characteristics 17 UVLO (ON) (V) 16.5 16 15.5 15 14.5 -40 Fig. 1 Istartup current vs. Temperature Fig. 3 UVLO (OFF) vs. Temperature Fig. 5 Green Mode Frequency vs. Temperature 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 0 40 80 Tem perature(℃) 120 Fig. 2 UVLO (ON) vs. Temperature Fig. 4 CCM Frequency vs. Temperature Fig. 6 Vcsmax vs. Temperature 7 Preliminary GR1230RA-02 Typical Performance Characteristics Fig. 7 VcsmaxL vs. Temperature Fig. 8 Vcomp open loop voltage vs. Temperature 4.8 Vcomp (OLP) (V) 4.6 4.4 4.2 4 3.8 -40 0 40 80 120 Tem perature(℃) Fig. 9 Vcomp (OLP) vs. Temperature Fig. 11 VCC Mode (Entry) vs. Temperature 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com Fig. 10 OLP delay time vs. Temperature Fig. 12 VCC OVP vs. Temperature 8 Preliminary GR1230RA-02 Application Information the switching frequency decreases. If the switching Overview The GR1230RA-02 is a high performance multi-mode (QR/CCM) PWM controller for flyback converter. This results in a low-cost solution for low power AC/DC adapters. It integrated more functions to reduce the external components counts and the size. Its major features are described as below. frequency lowers than 65kHz frequency, the controller adaptively transitions to a CCM mode. Thus, small size transformer can be used with high power conversion efficiency. As the output load current is decreased, the on-time TON is decreased, and thus the switching frequency increases. If the switching frequency increases till Start-up Current over the clamp of 69kHz, IC will skip the first valley The typical start-up current is 1.5uA. Very low to turn on in 2 nd rd or 3 valley. start-up current allows the PWM controller to At light load conditional, the VCOMP is lower than increase the value of start-up resistor and then VSG1 and the system operates in green mode for reduce the power dissipation on it. high Under-voltage Lockout (UVLO) switching frequency clamp will start to linearly A hysteresis UVLO comparator is implemented in decrease from 69kHz to 25kHz. The valley GR1230RA-02, then the turn-on and turn-off switching characteristic is still preserved in green thresholds level are fixed at 16V and 7.5V mode. That is, when load decreases, the system respectively. automatically skip more and more valleys and the This hysteresis shown in Fig.13 power conversion efficiency. The max ensures that the start-up capacitor will be adequate switching frequency is thus reduced. to supply the chip during start-up. At zero load or very light load conditions (Vcomp< Burst mode voltage), the gate output pin of the Vcc GR1230RA-02 will be disabled immediately under such condition, enhancing power saving. UVLO (on) Frequency UVLO (off) Improve light load eff. Lower switching loss Lower conduction loss 69 K 65K Fig.13 Multi-Mode Operation for High Efficiency 25K Burst Mode Green Mode Valley Skip QR Mode CCM COMP GR1230RA-02 is a multi-mode QR/CCM controller. The controller changes the mode of operation according to switching frequency and comp pin voltage, as shown in the Fig.14. At the normal operating condition, the IC operates in QR mode to reduce the switching loss. In the QR mode, the frequency varies depending on the line voltage and the load conditions. As the output load current is Fix Frequency Fig.14 Quasi-Resonant Detection The QR detection block will detect auxiliary winding voltage to turn on the MOSFET. The time-out2 generates a MOSFET turn-on signal as the driver output drops to low level for more than 150μs (Time Out) with the falling edge of the driver output. increased, the on-time TON is increased, and thus 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 9 Preliminary GR1230RA-02 Leading-edge Blanking (LEB) Output OVP on QRD - Auto Recovery mode Each time the power MOSFET is switched on, a An output overvoltage protection is implemented in turn-on spike will inevitably occur at the sense the GR1230RA-02, as shown in Fig. 16 and 17. It resistor. To avoid fault trigger, a leading-edge senses the auxiliary voltage via the divided resistors. blanking time is built in. During this blanking period, The overvoltage protection works by sampling the the current-limit comparator is disabled and cannot plateau voltage after a delay time. The sampling switch off the gate driver. voltage level is compared with internal threshold voltage 3.5V. If the sampling voltage exceeds the Internal Slope Compensation A built-in slope compensation circuit is constructed in GR1230RA-02. When the switch is on, a ramp voltage is added to the sensed voltage across the CS pin, which helps to stabilize the system and QRD OVP trip level, the QRD OVP circuit switches the power MOSFET off. The QRD OVP function is an auto-recovery type protection. The de-bounce time of QRD OVP is 128μs to prevent incorrect OVP detection which might occur during ESD or lightning prevent sub-harmonic oscillations. events. Over-voltage Protection (OVP) on Auto Output Under-voltage Protection (UVP) on Recovery mode To prevent power MOSFET from being damaged, the GR1230RA-02 is implemented an OVP function on VCC. When the VCC voltage is higher than the OVP threshold voltage, the output gate driver circuit will be shut down immediately to stop the switching of power MOSFET. The VCC OVP function is an auto-recovery type protection. If OVP happens, the QRD– Auto Recovery mode To protect the circuit from damage due to output short condition, an auto-recovery type of UVP protection is implemented for it. If the QRD voltage declines below 0.5V for over the 8ms, the protection will be activated to turn off the gate until the next UVLO-ON. pulses will be stopped and recover at the next UVLO on. The GR1230RA-02 is working in a hiccup 0.5V NAUX + - UVP Debounce 8ms + - OVP Debounce 128us mode as shown in Fig. 15. QRD S/H 3.5V VCC OVP Tripped OVP Level Fig.16 UVLO(on) UVLO(off) OUT t OUT QRD Switching Non-Switching Switching t Sample Fig.15 Fig.17 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 10 Preliminary GR1230RA-02 duty will disappear and no power delivers to the OLP (Open Loop Protection) – Auto secondary. If there is without any mechanism to Recovery mode prevent this situation, the VCC pin voltage will down The GR1230RA-02 has open loop protection to UVLO off and the IC will re-start again. In the function. An internal circuit detects the Vcomp level, GR1230RA-02, before the VCC is down to UVLO when the Vcomp is larger than an OLP threshold off, it will force the OUT pin outputs the specified level and continues over OLP delay time, the duty to pull the VCC higher than UVLO off. protection will be activated and then turn off the The VCC mode function is used to prevent the gate output to stop the switching of power circuit. output re-start again when load changes. So never Then VCC decreases below UVLO off level, the let the system operate on the VCC mode at no load. controller resets again. The system should operate on burst mode, Gate Clamp/Soft Driving otherwise the input power maybe become larger. Driver output is clamped by an internal 13.5V clamping circuit to prevent from undesired Fault Protection over-voltage gate signals. And under the conditions There are several critical protections integrated in listed below, the gate output will turn off immediately the to protect the power circuit. The GR1230RA-02 also . CS pin floating has soft driving function to minimize EMI. . Comp pin shorting VCC Mode Operation . Comp pin floating In order to avoid the output voltage shut down by . QRD pin shorting load changing from full to no load, the GR1230RA-02 is built-in the VCC mode function. When the load from full changes to no load, the output voltage will overshoot and pull low the COMP pin by feedback loop (Into burst mode). Thus the 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 11 Preliminary GR1230RA-02 Package Information SOT-26 SOT-26 SYMBOL MILLIMETERS MIN. INCHES MAX. A MIN. MAX. 1.45 0.057 A1 0.00 0.15 0.000 0.006 A2 0.90 1.30 0.035 0.051 b 0.30 0.50 0.012 0.020 c 0.08 0.22 0.003 0.009 D 2.70 3.10 0.106 0.122 E 2.60 3.00 0.102 0.118 E1 1.40 1.80 0.055 0.071 e 0.95 BSC 0.037 BSC e1 1.90 BSC 0.075 BSC L θ 0.30 o 0 0.60 8 o 0.012 o 0 0.024 8 o Note: 1. Followed from JEDEC MO-178 AB. 2. Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 10 mil per side 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 12 Preliminary GR1230RA-02 Carrier Tape & Reel Dimensions SOT-26 Application A H 178.0±2.00 50 MIN. P0 P1 P2 D0 D1 4.0±0.10 4.0±0.10 2.0±0.05 1.5+0.10 -0.00 1.0 MIN. SOT-26 Application SOT -26 T1 C d 8.4+2.00 13.0+0.50 1.5 MIN. -0.00 -0.20 D W E1 F 20.2 MIN. 8.0±0.30 1.75±0.10 3.5±0.05 T A0 B0 K0 0.6+0.00 -0.40 3.20±0.20 3.10±0.20 1.50±0.20 Carrier Width Cover Tape Width Devices Per Reel 8 5.3 3000 (mm) 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 13 Preliminary GR1230RA-02 Tape and Specification Reel SOT- 26 Direction of feed ________________________________________________________________________ Grenergy OPTO, Inc. reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 2016.10. Ver.E Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 14