GR8837TCG

GR8837T Green-Mode PWM Controller with Hiccup Protection Features Description  Current Mode Control The GR8837T is a highly-integrated, low startup  Standby Power below 100mW 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 GR8837T 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  300mA Driving Capability Application current mode PWM controller with .  Battery Charger  Open Frame SMPS  Switching AC/DC Adapter Ordering and Marking Information GR8837T Package Code RoHS Code G: Green (Halogen Free) Device L: PB Free Device J: DIP-8 C: SOT-26 DIP-8 SOT-26 GR8837T X X XXX 37T X X XXX Code 1 Serial No. Code 1 Serial No. Code 2 Code 1 8 Year 2008 Code 2 9 2009 A 2010 B 2011 Code 2 1 2 3 4 Month Jan. Feb. Mar. Apr. G 2016 ● ● ● H 2017 I 2018 J 2019 9 A B C Sep. Oct. Nov. Dec. Nanjing Greenchip Semiconductor Co., Ltd. Inc. (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. 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 1 GR8837T 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) -65℃ ~ 150 ℃ -------------------------------------------------- Power dissipation (SOT-26, at ambient temperature = 85℃) Power dissipation (DIP-8, at ambient temperature = 85℃) -20℃ ~ 85℃ 250℃/W ------------------------------------------------ 250mW --------------------------------------------------- 650mW Lead temperature (All Pb free packages, soldering, 10 sec) -------------------------------------------------- 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 260℃ 2 GR8837T ESD voltage protection, human body model ESD voltage protection, machine model -------------------------------------------------------------------------- ------------------------------------------------------------------------------ 2KV 200V 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 - 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 5.8 6.8 7.8 V UVLO(on) 5 10.3 11.3 12.3 V OVP Level on VCC Pin –Auto Recovery Mode 5 27 28 29 V 0.8 mA 5.5 V Operating Current (with 1nF load on OUT pin), Protection Tripped (OLP, OVP) uA VOLTAGE FEEDBACK Short Circuit Current, Vcomp = 0V 2 Open Loop Voltage, COMP Pin Open 2 Green-Mode Start Voltage 2 1.5 V Burst Mode Start Voltage 2 0.85 V 4.4 CURRENT SENSING Maximum Input Voltage, Vcs(off)- Auto Recovery Mode 4 Leading-Edge Blanking Time 4 Input Impedance 4 Delay to Output 4 0.80 0.85 0.9 350 V nS 1 MΩ 100 nS OSCILLATOR Frequency - Jitter Frequency - Green Mode Frequency - Temp. Stability (-40°C ~ 110°C) Voltage Stability (VCC = 11V~25V) 60 65 70 +6 20 22 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 6 200 nS Falling Time, Load Capacitance = 1000pF 6 80 nS GATE DRIVER OUTPUT 8 V 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 3 GR8837T VGATE-Clamp (VCC = 25V ) 6 12 13 V OLP SECTION OLP Trip Level, Vcomp (OLP) - 3.5 V OLP Delay Time - 60 mS PWM SECTION Maximum Duty Cycle - 70 75 80 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com % 4 GR8837T RTL SECTION Over Voltage Protection Threshold Voltage 3 3.2 3.5 3.8 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 100 0.95 1 V uS 1.05 100 V us 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 5 GR8837T 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 6 GR8837T 10.8 7.0 10.7 6.9 UVLO (off) (V) UVLO (on) (V) Typical Performance Characteristics 10.6 10.5 6.8 6.7 6.6 10.4 10.3 -40 0 40 80 6.5 -40 120 125 10.0 8.0 6.0 4.0 -40 0 40 80 120 125 80 120 125 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) 40 2.2 Operating current (mA) VDD Start up current (uA) 12.0 2.0 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 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 7 GR8837T 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 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 8 GR8837T Application Information Start-up Current Fig.9 The typical start-up current is around 8uA. Very low start-up current allows the PWM controller to increase the value of start-up resistor and then reduce the power dissipation on it. UVLO (Under Voltage Lockout) A hysteresis UVLO comparator is implemented in GR8837T Then turn-on and turn-off thresholds level are fixed at 11.3V and 6.8V respectively. This hysteresis shown in Fig.9 ensures that the start-up capacitor will be adequate to supply the chip during Soft Start During initial power on, the GR8837T provides 16ms soft start function. It effectively suppresses the start 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. start-up. The GR8837T is designed to meet the standby power below 100mW. So the start-up resistor can be used as several Mega Ohms to Green-Mode Operation reduce the power loss. Due to the low UVLO on When the load decreases to an extent, the level, so the turn-on delay time will be also never frequency of the controller will decrease so as to greater than the general PWM IC. reduce Vcc the system power consumption. The minimum frequency is about 22 KHz, which is outside the audio range. UVLO (on) 11.3V UVLO (off) 6.8V LEB (Leading-Edge Blanking) Each time the power MOSFET is switched on, a turn-on spike will inevitably occur at the sense resistor. To avoid fault trigger, a 350ns leading-edge blanking time is built in. Conventional RC filtering can therefore be omitted. During this blanking 9 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com GR8837T period, the current-limit comparator is disabled and OVP (Over Voltage Protection) on VCC can not switch off the gate driver. To prevent power MOSFET from being damaged, the GR8837T is implemented an OVP function on 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 oscillation and thus reduces the output ripple 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 pin OVP function is an Auto-recovery type protection. GR8837T is working in voltage. Auto-recovery mode as shown in Fig. 11. VCC OLP (Over Load Protection) OVP Tripped The GR8837T has over load protection function. An internal circuit detects the load level, when the load OVP Level UVLO(on) UVLO(off) is larger than a threshold level and the condition lasts more than 60ms, the gate output will keep on t OUT low level. Then VCC decreases below UVLO off level, the controller resets again. Fig.10 shows the Switching Non-Switching Switching waveform of the OLP operation. t Fig. 11 Gate Clamp/Soft Driving Driver is clamped to 13V by an internal clamping 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. VCC Mode Operation VCC In order to avoid the output voltage shut down by UVLO(on) load changing from full to no load, the GR8837T 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 GR8837T, 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. 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 10 GR8837T The operation is shown in Fig.12. 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 VCC the voltage on this pin is higher than 3.5V or lower Burst mode VCC mode VCC mode(off) VCC mode(on) than 1.0V, the GR8837T will enter Auto-recovery UVLO(off) protection after the de-bounce time 100us. t LOAD Full load t OUT Switching t Fig. 12 The VCC mode function is used to prevent the 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. 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 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 11 GR8837T 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 12 GR8837T Typical Application Circuit GR8837T 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 13 GR8837T 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 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 14 GR8837T 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. 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 15 GR8837T 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) 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 16 GR8837T Tape and Specification Reel SOT 26 Direction of feed ______________________________________________________________________ Nanjing Greenchip Semiconductor Co., Ltd. Inc. (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. 2018.09 Ver.1.0 Copyright Nanjing Greenchip Semiconductor Co., Ltd. Inc. (Grenergy OPTO, Inc.) www.grenergy-ic.com 17