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APW7037 Datasheet(PDF) 4 Page - Anpec Electronics Coropration |
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APW7037 Datasheet(HTML) 4 Page - Anpec Electronics Coropration |
4 / 11 page Copyright ANPEC Electronics Corp. Rev. A.6 - Apr, 2005 APW7037/A/B www.anpec.com.tw 4 1+ R OUT R GND () Functional Pin Description FB (Pin 1) Connect this pin to the output (VOUT) of the PWM con- verter via an external resistor divider to provide a volt- age feedback path for the converter. The output volt- age set by the resistor divider is determined using the following formula : VOUT = VREF x where ROUT is the resistor connected from VOUT to FB , and RGND is the resistor connected from FB to ground. The voltage at this pin is also monitored for Under- Voltage protection. VCC (Pin 2) Connect this pin to input voltage from 5V to 20V. This pin provides the bias for the control circuitry and the low-side power MOSFET driver (LDRV). The voltage at this pin is monitored for Power-On Reset (POR) purpose. LDRV (Pin 3) Connect this pin to the gate of the low-side power MOSFET. This pin provides the gate drive for the MOSFET. GND (Pin 4) Signal and power ground for the IC. All voltage levels are measured with respect to this pin. HDRV (Pin 5) Connect this pin to the gate of the high-side power MOSFET. This pin provides the gate drive for the MOSFET. VC (Pin 6) This pin provides bias voltage to the high-side MOSFET driver. A bootstrap circuit may be used to pump a boot voltage for enforcing the driving capabil- ity of the gate driver and improving the performance of the MOSFET. COMP (Pin 7) This pin is the output of the error amplifier. Add an external resistor-capacitor network to provide a loop compensation for the PWM converter. SS (Pin 8) Connect a capacitor from this pin to ground.This capacitor, along with an internal 20uA current source, sets the soft-start interval of the PWM converter and prevents the outputs from overshoot as well as limits the input current. Pull this pin below 0.5V can shut- down the converter. Electrical Characteristics (Cont.) Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA=0 to 70 °C. Typical values refer to TA=25 °C. APW7037/A/B Unit Symbol Parameter Test Conditions Min. Typ. Max. GATE DRIVERS HDRV Rising Time CL = 1500pF 20 50 nS HDRV Falling Time CL = 1500pF 15 50 nS LDRV Rising Time CL = 1500pF 25 50 nS LDRV Falling Time CL = 1500pF 25 50 nS Dead Band Time 50 150 250 nS PROTECTION VFBUV FB Under-Voltage Threshold VFB Falling APW7037 APW7037A APW7037B 0.4 0.3 0.3 0.6 0. 4 0.4 0.8 0. 5 0.5 V VSD Shutdown Threshold Voltage Pull the voltage of SS pin 0.5 V ISS Soft-Start Current SS=0 10 20 30 µA |
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