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HV101 Demo Board
HV101DB1
3-Pin Hotswap Controller
Introduction
The Supertex HV101DB1 demo board contains all necessay circuitry to demonstrate the features of the HV100 hotswap controller. Intended primarily as a negative hotswap controller, the HV101 controls the negative supply path. Included on board is a 100F capacitor (C3) to provide a capacitive load for testing. Additional capacitance may be connected to the VOUT terminals. Or the 100F may be removed altogether The board may be modified to meet custom requirements. Instructions are provided on the next page for modifications.
Specifications
Input Voltage Peak Inrush Limit Max Short Circuit Current1 Circuit Breaker Response Time1 Auto Retry On Resistance Undervoltage Trip
1
10V to 72V 1.4A typ 4A typ 1ms typ 2.5s typ 210mW_ max 15V on, 14V off
During inrush limiting
Board Layout and Connections
VPP IN
+OUT VPP OUT U1 DRAIN GATE Q1 + C3 -OUT
VIN
VNN IN
C2 C1 R2
VOUT
Power Supply or Load
Current Probe
R1
VIN
Connect the supply voltage to these terminals. Supply voltage may range from 10 volts to 72 volts. A high source impedance may cause oscillations when the input voltage is near the undervoltage trip point. A high source impedance results in a large voltage drop when loaded, causing undervoltage lockout to kick in, disconnecting the load. With the load removed, input voltage rises, causing undervoltage to release and reconnecting the load. The cycle repeats, resulting in oscillations. Source impedance must be less than the following to avoid oscillations:
alt Q1
VOUT
Connect the power supply or other load to these terminals. VOUT+ is connected to VIN+, it is VOUT- that is switched. Application of a DC load during start-up and/or additional load capacitance extends the time inrush limiting is active. If this time exceeds 100ms, the HV101 shuts off, retrying 2.5s later. For this reason, DC load at start-up should be less than 900mA. Note that DC start-up load limitation decreases with added load capacitance. Note that the circuit breaker functions during inrush only.
RSOURCE =
01/21/02
1.5V I LOAD
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the 1 Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
HV101 Demo Board
HV101 Demo Board Schematic
VPP OUT VPP IN OUT+
VPP
HV101
VNN C2 not used GATE GATE C1 not used R2 not used C3 100F
VNN IN
current probe
OUTR1 0 Q1 IRFR120N DRAIN
A very high dV/dt on the input can overload the HV101's internal gate clamp, causing turn-on transients. A capacitor in the C2 position may be used to clamp the gate, preventing the transients. A 1nF value is usually adequate. Voltage rating should be 16 volts. To limit short-at-turn-on current, zero-ohm resistor R1 may be replaced with a low value resistor. This resistor causes a voltage drop that tends to cancel-out the applied gate voltage, thus limiting drain current.
To reduce peak inrush current, a capacitor from gate to drain (C1) may be employed. A resistor (R2) is also needed in this configuration for loop stability. Please refer to the HV101 data sheet for further information. Note: When making positive-ground measurements, scope probe loading on the GATE pin may interfere with normal operation. To observe gate voltages, use negative-ground measurements.
01/21/02
(c)2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
2
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com

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