PDF《ISL6722A, ISL6723A》

3 VREF SS 12K ON ON ON 30K

100 5K 4.5K 20K VCC ISENSE ISET COMP SS OV UV GATE SLOPE VFB PGND VC SYNC RTCT LGND VREF SOFTSTART CHARGE CURRENT FAULT LATCH PWM COMPARATOR SET DOMINANT SS LOW 0.8 SS CLAMP 2.5V ENABLE SS LOW COMPARATOR VREF UV COMPARATOR 4.65V 4.375 V 1mA 4V 3.0V 1.5V OSCILLATOR COMPARATOR

70 ?A 3.0V BLANKING COMPARATOR OC DETECT SS CHARGED + - START/STOP UV COMPARATOR VREF 5.00 V

1 % + - BG + - + - 100mV + + Σ 0.1

53 ?A + - + - ERROR AMPLIFIE R + - 1/3 VREF + - ON VREF + - VREF

15 ?A + - + -

25 ?A + - + - 270mV S R Q Q + - OVERCURRENT COMPARATOR

100 nS BLANKING + - + - START + - + - VREF + - + - + - 2.50V 1.45V BG + - 36K + - 2V SYNC IN SYNC OUT EXT SYNC BLANKING NO EXT SYNC CLK OUT Bi-Directional Synchronization OSC IN SS CHARGE VOLTAGE CLAMP RESTART DELAY S R Q Q OVERCURRENT SHUTDOWN DELAY SS DCHG SS CHG SHTDN OC OC FAULT 内部电路结构 (ISL6723A) ISL6722A, ISL6723A

4 VIN+ VIN- RETURN SLEEP T1 ISOLATION XFMR Q3 36-75V VR1 +1.8V ISL6722A LGND VCC SLEEP RTCT ISENSE ISET VFB SS GATE SLOPE UV OV COMP VREF VC PGND +3.3V C1 C2 C3 R1 R2 R24 C18 Q1 R4 CR6 C5 R22 U2 CR2 CR5 CR4 C17 R21 U3 R16 C14 C13 R15 R19 R17 R18 R20 C15 C16 R14 C12 C11 C10 C9 R13 R12 R11 C8 R10 C7 R8 R9 R7 R5 R6 D2 + + P9 C21 C19 C22 C20 + + D1 Q2 R25 C6 TP3 TP2 TP5 TP4 TP1 SP1 SP2 R26 R27 R3 R23 C4 U4 典型应用电路 C 48V 输入, 两个输出反馈转换 3.3V @ 2.5A, 1.8V ISL6722A, ISL6723A

5 额定值 Supply Voltage, VCC, VC GND C 0.3V to +20.0V GATE GND C 0.3V to Gate Output Limit Voltage PGND to LGND-0.3V VREF GND C 0.3V to 5.3V Signal Pins GND C 0.3V to VREF Peak GATE Current 1A ESD Classification Human Body Model (Per JESD22-A114C.01)1250V Charged Device Model (Per JESD22-C101-A)1000V 运行条件 Supply Voltage Range (Typical)9V-18VDC Temperature Range ISL6722AAxZ

40 o C to

105 o C ISL6723AAxZ-40 o C to

105 o C 热性能的资料 Thermal Resistance Junction to Ambient (Typical) θJA ( o C/W)

16 Lead SOIC (Note 1)80

16 Lead TSSOP (Note 1)105 Maximum Junction Temperature

55 o C to

150 o C Maximum Storage Temperature Range-65 o C to

150 o C Maximum Lead Temperature (Soldering 10s)300 o C (SOIC, TSSOP C Lead Tips Only) CAUTION: Stress above those listed in Absolute Maximum Ratings may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Notes: 1) θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 2) All voltages are with respect to GND. Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Block Diagram and Typical Application Schematic. 9V <

VCC = VC <

20V, RT = 11k?, CT = 330pF, TA = -40o C to 105o C (Note 3), Typical values are at TA= 25o C (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS UNDERVOLTAGE LOCKOUT START Threshold (ISL6722A) SLEEP = 0V 7.95 8.25 8.55 V START Threshold (ISL6723A) 12.4

13 13.4 V STOP Threshold 7.4 7.7 8.2 V Hysteresis (ISL6722A) 0.50 0.55 1.00 V Hysteresis (ISL6723A) 4.00 5.00 6.00 V Start-Up Current, ICC VCC <

START Threshold -

100 175 ?A OC/OV Fault Operating Current, ICC -

200 300 ?A Operating Current, ICC - 4.5 10.0 mA Operating Supply Current, IC Includes 1nF GATE loading - 8.0 12.0 mA REFERENCE VOLTAGE Line, load, TA =

0 - 105°C 4.95 5.00 5.05 V Overall Accuracy Line, load, TA = -40 - 105°C 4.90 5.00 5.05 V Long Term Stability TA = 125°C,