isl97645a Intersil Corporation, isl97645a Datasheet
isl97645a
Available stocks
Related parts for isl97645a
isl97645a Summary of contents
Page 1
... Ld 4x4 QFN L24.4x4D ISL97645AIRZ-T* 976 45AIRZ - 4x4 QFN ISL97645AIRZ-TK* 976 45AIRZ - 4x4 QFN *“-T” or “-TK” suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets ...
Page 2
... Gate Pulse Modulator Slew Control. Connect a resistor between this pin and GND to set the falling slew rate Gate Pulse Modulator Delay Control. Connect a capacitor between this pin and GND to set the delay time. 24 VGH Gate Pulse Modulator High Voltage Input 2 ISL97645A DESCRIPTION FN6353.0 July 2, 2007 ...
Page 3
... Overall Accuracy (Line, Load, AVDD Temperature) V Feedback Voltage ( Input Bias Current FB 3 ISL97645A Thermal Information Thermal Resistance 4x4 QFN Package (Notes Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Maximum Continuous Junction Temperature . . . . . . . . . . . +125°C Power Dissipation ≤ +25° .2.44W +70° ...
Page 4
... SUPPLY MONITOR VIH_VDIV VDIV High Threshold VIL_VDIV VDIV Low Threshold I CD2 Charge Current CD2 RIL_RESET RESET Pull-Down Resistance T RESET Delay on the Rising Edge DELAY_RESET 4 ISL97645A TEST CONDITION FREQ = 0V FREQ = V IN2 SS < 1V +25° 10pF, Unless Otherwise Stated I (source) = 5mA OUT I (source) = 50mA ...
Page 5
... VDD FIGURE 1. A EFFICIENCY vs IA VDD 10.5 10.45 A 150mA VDD 10.4 10.35 10.3 10.25 10.2 10.15 3 3.5 4.0 4.5 V (V) IN FIGURE 3. LINE REGULATION 1pF 100k VGH_M VFLK FIGURE 5. GPM CIRCUIT WAVEFORM 5 ISL97645A = 650kHz -0.1 = 1.2MHz -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 800 1000 1200 VDD L = 10µ 500mA VDD 5.0 5.5 6 FIGURE 4. BOOST CONVERTER TRANSIENT RESPONSE VDD IN 0 ...
Page 6
... Typical Performance Curves CE = 10pF 100k VGH_M VFLK FIGURE 7. GPM CIRCUIT WAVEFORM FIGURE 9. V FOLLOWS V WHEN THE SYSTEM GHM GH POWERS OFF 6 ISL97645A (Continued) INPUT SIGNAL OUTPUT SIGNAL (-3dB ATTENTUATION FROM INPUT SIGNAL) FIGURE 11. V BANDWIDTH MEASUREMENT COM CE = 10pF 150k VGH_M VFLK FIGURE 8. GPM CIRCUIT WAVEFORM ...
Page 7
... FAULT CONTROL ENABLE 10µA CD2 + - V REF RESET VDIV + - V REF 750Ω VFLK VGH 7 ISL97645A SUMMING AMPLIFIER START-UP AND + - GPM CIRCUIT VGH_M CE RE FIGURE 12. ISL97645A BLOCK DIAGRAM LX PWM LOGIC 2.5µ 20µA PGND SS VIN VDPM OUT VDD2 POS NEG GND VDD1 FN6353.0 July 2, 2007 ...
Page 8
... This part also integrates Gate Pulse Modulator circuit that can help to optimize the picture quality. Enable Control When enable pin is pulling down, the ISL97645A is shut down reducing the supply current to <10µA. When the voltage at enable pin reaches 2.2V, the ISL97645A is on. 8 ...
Page 9
... ISL97645A The current through the MOSFET is limited to 2.6A This restricts the maximum output current (average) based on Equation 3: I OMAX Where ΔI by Equation 4: (EQ. 1) Δ where f Table 2 gives typical values (margins are considered 10%, 3%, 20%, 10% and 15 ...
Page 10
... RLF7030T-6R8N3R0 CDR8D43-100NC Compensation CD1-5R2 The boost converter of ISL97645A can be compensated network connected from CM1 pin to ground. 4.7nF and 10k RC network is used in the demo board. The larger value resistor and lower value capacitor can lower the transient overshoot, however, at the expense of stability of the loop. ...
Page 11
... RE. Note that VDD1 is used only as a reference voltage for an amplifier, thus does not have to source or sink a significant DC current. 11 ISL97645A Low to high transition is determined primarily by the switch resistance and the external capacitive load. High to low transition is more complex. Take the case where the block is already enabled (VDPM is H) ...
Page 12
... VGH_M VGH_M VDD1 RE CE VFLK FIGURE 16. GATE PULSE MODULATOR CIRCUIT BLOCK DIAGRAM 12 ISL97645A VGH x240 200µA CONTROL AND TIMING EnGPM1 VREF FN6353.0 July 2, 2007 ...
Page 13
... If this voltage is not desired, the following circuit can be inserted between input and inductor to disconnect the DC path when the part is disabled. 13 ISL97645A lope is controlled ela y tim dela y tim e is ...
Page 14
... V have settled again before the next line is processed. Fault Protection ISL97645A provides the overall fault protections including over current protection and over-temperature protection. An internal temperature sensor continuously monitors the die temperature. In the event that die temperature exceeds the thermal trip point, the device will shut down and disable itself ...
Page 15
... Package Outline Drawing L24.4x4D 24 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 2, 10/06 4.00 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 15 ISL97645A 4X A 20X 24X ± BOTTOM VIEW ± SIDE VIEW ( 20X 24X 24X 0 ...