GR1837CG

Preliminary GR1837 Green-Mode PWM Controller with Hiccup Protection Features Description  Current Mode Control The GR1837 is a highly-integrated, low startup  Standby Power below 75mW current,  Under-Voltage Lockout (UVLO) green-mode function. The integrated functions also  Non-Audible-Noise Green-Mode Control include the leading-edge blanking of the current  65KHz Switching Frequency sensing, internal slope compensation, soft start  Internal Leading-Edge Blanking OLP, and OCP. Besides, The RTL pin Auto recovery  Internal Slope Compensation function by injecting a high over 3.5V to provide  Internal Soft Start OVP Auto recovery and low below 1V to provide  Gate Output Voltage Clamp OTP Auto recovery protection. These functions  Jitter and Soft Driving for Reducing EMI enable the power supply to easily meet even the  External OVP Auto Recovery Mode strictest power requirements.  External OTP Auto Recovery Mode The GR1837 improves the performance and  Over-Load Protection (OLP) -Auto Recovery reduces the cost of power supplies. It is with 8-pin Mode DIP and 6-pin SOT-26 package.  Vcc OVP Protection- Auto Recovery Mode Application  300mA Driving Capability  Battery Charger  Open Frame SMPS  Switching AC/DC Adapter current mode PWM controller with Ordering and Marking Information GR1837 Package Code RoHS Code G: Green (Halogen Free) Device L: PB Free Device J: DIP-8 C: SOT-26 DIP-8 SOT-26 GR1837 X X XXX A37X XXXX Serial No. Code 1 Code 2 Code 2 Code 1 8 Year 2008 9 2009 A 2010 B 2011 Code 2 Month 2 Feb. 3 Mar. 4 Apr. 1 Jan. ● ● ● Code 1 Serial No. G 2016 H 2017 I 2018 J 2019 9 Sep. A Oct. B Nov. C Dec. Nanjing Greenchip Semiconductor Co., Ltd. (Grenergy OPTO Inc.) reserves the right to make changes to improve reliability or manufacture ability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 1 Preliminary GR1837 Pin Configuration GND 1 6 OUT COMP 2 5 VCC RTL 3 4 CS Pin Description Pin No. Name Function 1 GND 2 COMP 3 RTL 4 CS 5 VCC Power supply pin 6 OUT The output driver for driving the external MOSFET Ground pin Voltage feedback pin, by connecting a photo-coupler to control the duty cycle Resistor trigger will enter auto recovery mode which a high over 3.5V for OVP auto recovery and a low below 1V for OTP auto recovery Current sense pin, connect to sense the MOSFET current Absolute Maximum Ratings Supply voltage VCC COMP, RTL, CS OUT --------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------- Junction temperature 30V -0.3 ~ 7V -0.3 ~ VCC + 0.3V ------------------------------------------------------------------------------------------------------- 150℃ Operating ambient temperature Storage temperature range ------------------------------------------------------------------------------ ---------------------------------------------------------------------------------- SOT-26 package thermal resistance (junction to ambient) ESD voltage protection, machine model 250℃/W ------------------------------------------------ 250mW --------------------------------------------------- 650mW Lead temperature (All Pb free packages, soldering, 10 sec) ESD voltage protection, human body model -65℃ ~ 150 ℃ -------------------------------------------------- Power dissipation (SOT-26, at ambient temperature = 85℃) Power dissipation (DIP-8, at ambient temperature = 85℃) -20℃ ~ 85℃ -------------------------------------------------- -------------------------------------------------------------------------- ------------------------------------------------------------------------------ 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 260℃ 2KV 200V 2 Preliminary GR1837 Electrical Characteristics (VCC = 15.0V & TA = +25℃,unless otherwise specified.) Parameter Pin Min. Typ. Max. Unit 15 uA SUPPLY VOLTAGE Startup current (VCC=UVLO on -0.1V) 5 8 Operating current (with 1nF load on OUT pin), Vcomp = 0V 5 800 Operating current (with 1nF load on OUT pin), Vcomp = 2.5V 5 1 2 3 mA 5 0.4 0.7 1 mA UVLO(off) 5 6.2 6.8 7.4 V UVLO(on) 5 10.6 11.3 12.0 V OVP level on VCC pin-latch Mode 5 27 28 29 V Short circuit current, Vcomp = 0V 2 0.2 Open loop voltage, COMP pin open 2 4.4 Green-mode start voltage 2 1.85 V Green mode threshold voltage 2 1.4 V Burst mode start voltage 2 0.85 V Operating current (with 1nF load on OUT pin), protection tripped (OLP, OVP) uA VOLTAGE FEEDBACK mA 5.5 V CURRENT SENSING Maximum input voltage at Low Line, Vcsmax 4 0.80 0.85 0.9 Maximum input voltage at High Line, VcsmaxL (Duty=0%) 4 0.60 V Leading-Edge Blanking Time 4 500 nS Input impedance 4 Delay to Output 4 1 V MΩ 100 nS OSCILLATOR Frequency - Jitter frequency - Green mode Minimum frequency - Temp. stability (-40°C ~ 110°C) Voltage stability (VCC = 11V~25V) 60 65 70 +6 21 23 KHz % 25 KHz - 5 % - 3 % Output low level, VCC = 15V, Io = 20mA 6 1 V Output high level, VCC = 15V, Io = 20mA 6 Rising time, load capacitance = 1000pF 6 320 nS Falling time, load capacitance = 1000pF 6 80 nS VGATE-clamp (VCC = 25V ) 6 13 V 3.5 V 60 mS GATE DRIVER OUTPUT 8 12 V OLP SECTION OLP trip level, Vcomp (OLP) OLP delay time - 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 3 Preliminary GR1837 PWM SECTION Maximum duty cycle - 70 75 80 % Over Voltage Protection threshold voltage 3 3.2 3.5 3.8 V OVP Debounce time 3 Over Temperature Protection threshold voltage 3 OTP Debounce time 3 Output current from RTL pin 3 75 80 85 uA RTL Pin voltage when floating 3 1.8 2.4 3.0 V RTL SECTION 100 0.95 1 uS 1.05 100 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) V us www.grenergy-ic.com 4 Preliminary GR1837 11.5 7.0 11.4 6.9 UVLO (off) (V) UVLO (on) (V) Typical Performance Characteristics 11.3 11.2 6.8 6.7 6.6 11.1 11.0 -40 0 40 80 6.5 -40 120 125 10.0 8.0 6.0 4.0 -40 0 40 80 120 125 120 125 1.8 1.6 1.4 1.2 -40 0 40 80 120 125 Temperature (℃ ) Fig. 3 VDD Start up current vs. Temperature Fig. 4 Operating current vs. Temperature Maximum Input Voltage of CS pin(V) 3.8 3.6 3.4 3.2 3.0 -40 2.0 Temperature (℃ ) 4.0 OLP-Trip Level (V) 80 2.2 Operating current (mA) VDD Start up current (uA) 12.0 2.0 40 0 Temperature (℃ ) Fig. 2 UVLO (off) vs. Temperature Temperature (℃ ) Fig. 1 UVLO (on) vs. Temperature 0 40 80 Temperature (℃ ) Fig. 5 OLP Trip - Level vs. Temperature 120 125 0.90 0.89 0.88 0.87 0.86 0.85 -40 0 40 80 120 125 Temperature (℃ ) Fig. 6 Maximum Input Voltage of CS pin vs. Temperature 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 5 Preliminary GR1837 2 5 Green Mode Frequency (KHz) 68 Frequency (KHz) 67 66 65 64 63 -40 0 40 80 Temperature (℃ ) Fig. 7 Frequency vs. Temperature 120 125 24 23 22 21 20 -40 0 40 80 120 125 Temperature (℃ ) Fig. 8 Green Mode Frequency vs. Temperature 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 6 Preliminary GR1837 Application Information Start-up Current Green-Mode Operation The typical start-up current is around 8uA. Very low When the load decreases to an extent, the start-up current allows the PWM controller to frequency of the controller will decrease so as to increase the value of start-up resistor and then reduce reduce the power dissipation on it. minimum frequency is about 22 KHz, which is UVLO (Under Voltage Lockout) the system power consumption. The outside the audio range. A hysteresis UVLO comparator is implemented in LEB (Leading-Edge Blanking) GR1837 Then turn-on and turn-off thresholds level Each time the power MOSFET is switched on, a are fixed at 11.3V and 6.8V respectively. This turn-on spike will inevitably occur at the sense hysteresis shown in Fig.9 ensures that the start-up resistor. To avoid fault trigger, a 500ns leading-edge capacitor will be adequate to supply the chip during blanking time is built in. During this blanking period, start-up. The GR1837 is designed to meet the the current-limit comparator is disabled and can not standby power below 75mW. So the start-up resistor switch off the gate driver. can be used as several Mega Ohms to reduce the power loss. Due to the low UVLO on level, so the turn-on delay time will be also never greater than the general PWM IC. Internal Slope Compensation Built-in slope compensation circuit adds voltage ramp in the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic Vcc oscillation and thus reduces the output ripple UVLO (on) 11.3V voltage. UVLO (off) 6.8V OLP (Over Load Protection) The GR1837 has over load protection function. An internal circuit detects the load level, when the load is larger than a threshold level and the condition Fig.9 lasts more than 60ms, the gate output will keep on Soft Start low level. Then VCC decreases below UVLO off During initial power on, the GR1837 provides 16ms level, the controller resets again. Fig.10 shows the soft start function. It effectively suppresses the start waveform of the OLP operation. up peak current to reduce the power MOSFET drain voltage especially at high line. Oscillator The maximum duty-cycle of internal oscillator is limited to 75% for avoiding the transformer saturation. The frequency of the oscillator is fixed to 65KHz by internal setting. 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 7 Preliminary GR1837 VCC Mode Operation VCC In order to avoid the output voltage shut down by UVLO(on) load changing from full to no load, the GR1837 is UVLO(off) OLP built-in the VCC mode function. When the load from ( off ) OLP Counter Reset t full changes to no load, the output voltage will COMP OLP delay time overshoot and pull low the COMP pin by feedback 3.5 V loop. Thus the duty will disappear and no power OLP trip Level t delivers to the secondary. If there is without any OUT mechanism to prevent this situation, the VCC pin Switching Non - Switching Switching voltage will down to UVLO off and the IC will re-start t again. In the GR1837, before the VCC is down to UVLO off, it will force the OUT pin outputs the Fig. 10 specified duty to pull the VCC higher than UVLO off. OVP (Over Voltage Protection) on VCC The operation is shown in Fig.12. To prevent power MOSFET from being damaged, the GR1837 is implemented an OVP function on VCC 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 VCC mode Burst mode VCC mode(off) VCC mode(on) UVLO(off) power MOSFET. The VCC pin OVP function is an Auto-recovery type protection. GR1837 is working in Auto-recovery mode as shown in Fig. 11. t LOAD Full load VCC t OVP Tripped OUT OVP Level Switching UVLO(on) UVLO(off) t t OUT Fig. 12 Switching Non-Switching Switching The VCC mode function is used to prevent the t Fig. 11 Gate Clamp/Soft Driving Driver is clamped to 13V by an internal clamping output re-start again when load changes. So never let the system operate on the VCC mode at no load. The system should operate on burst mode, otherwise the input power maybe become larger. circuit. A totem pole gate driver is fine tuned to meet both EMI and efficiency requirement in low power application. An internal pull low circuit is activated after pretty low Vdd to prevent external MOSFET from accidentally turning on during UVLO. 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 8 Preliminary GR1837 RTL Pin Auto-Recovery Mode VDD Auto-Recovery Mode VH_TH 3.5V Normal Operation RTL pin 1V VL_TH Auto-Recovery Mode Fig. 13 The typical application for RTL pin is shown in Fig. 13. The Zener diode is setting as external OVP protection and the NTC thermal resistor is setting as external OTP protection. In the RTL pin, there are two comparators for Auto-recovery protection. While the voltage on this pin is higher than 3.5V or lower than 1.0V, the GR1837 will enter Auto-recovery protection after the de-bounce time 100us. 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 9 Preliminary GR1837 Application Circuit 1. Typical Circuit EMI FILTER RTL VCC GND OUT COMP CS 2. RTL Circuit EMI FILTER NTC QRD VCC GND OUT COMP CS 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 10 Preliminary GR1837 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 0.024 o 0 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 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 11 Preliminary GR1837 Package Information DIP-8 DIP-8 SYMBOL MILLIMETERS MIN. INCHES MAX. A MIN. MAX. 5.33 0.210 A1 0.38 0.015 A2 2.92 4.95 0.115 0.195 b 0.36 0.56 0.014 0.022 b2 1.14 1.78 0.045 0.070 c 0.20 0.35 0.008 0.014 D 9.01 10.16 0.355 0.400 D1 0.13 E 7.62 8.26 0.300 0.325 E1 6.10 7.11 0.240 0.280 0.005 e 2.54 BSC eA 7.62 BSC eB L 0.100 BSC 0.300 BSC 10.92 2.92 3.81 0.430 0.115 0.150 Note: 1. Followed from JEDEC MS-001 BA. 2. Dimension D, D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 10 mil. 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 12 Preliminary GR1837 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) 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 13 Preliminary GR1837 Tape and Specification Reel SOT 26 Direction of feed ______________________________________________________________________ Nanjing Greenchip Semiconductor Co., Ltd. (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. 2017.10. Ver.C Copyright Nanjing Greenchip Semiconductor Co., Ltd.( Grenergy OPTO Inc.) www.grenergy-ic.com 14