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GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Description
The KA7500 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit. Designed primarily for power supply control, these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to his application. The KA7500 contains an error amplifier, an onchip adjustable oscillator, a dead-time control comparator, pulse-steering control flipflop, a 5volt, 1% precision regulator, and output-control circuits. The error amplifier exhibits a commonmode voltage range from -0.3 volts to VCC -2 volts. The dead-time control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip oscillator may be bypassed by terminating RT (pin 6) to the reference output and providing a sawtooth input to CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be selected through the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation.
Features
High Current totem Pole Output Stage Complete PWM Power Control Circuitry Uncommitted Outputs for 200 mA Sink or Source Current Output Control Selects Single-Ended or Push-Pull Operation Internal Circuitry Prohibits Double Pulse at Either Output Variable Dead-Time Provides Control over Total Range Internal Regulator Provides a Stable 5-V Reference Supply, 1% Circuit Architecture Allows Easy synchronization
Functional Block Diagram
Output Control RT CT Oscillator Pulse Steering Flip-Flop 0.1V Dead Time Control Comparator C1 E1 C2 E2
Dead Time Control
Non Inverting Input Inverting Input Non Inverting Input Inverting Input
Error Amplifier 1
PWM Comparator
Reference Feedback Error Amplifier 2
VREF GND
www.gammamicro.com.tw 1
GM7500 V1.00
VCC
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Marking Information and Pin Configurations (Top View)
SO16 and DIP16
1. Non-inverter Input 2. Inverter Input 3. Feedback 4. Dead Time Control 5. CT 6. RT 7. GND 8. C1 16. Non-inverter Input 15. Inverter Input 14. REF Out 13. Output Control 12. VCC 11. C2 10. E2 9. E1
A: Assembly / Test site code Y: Year WW: Week
GM7500 AYWW
Ordering Information
Ordering Number GM7500S16T GM7500S16R GM7500D16T Package SO16 SO16 DIP16 Shipping 50 Units/Tube 2500 Units/Reel 25 Units/Tube
GM7500 V1.00
2
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Absolute Maximum Ratings
PARAMETER Supply Voltage Amplifier input voltage Collector output voltage Collector output current Operating Ambient Temperature Range Storage Temperature Lead Temperature (soldering 10 sec.)
* Maximum Package Power Dissipation Limits must be observed.
RATINGS 41 VCC + 0.3 41 250 - 40 to 125- 65 to 150 260
UNITS V A V mA C C C
Recommended Operating Conditions
PARAMETER Supply Voltage Amplifier input voltage Collector output voltage Collector output current (each transistor) Current into feedback terminal Timing Capacitor Timing Resistor Oscillator frequency Operating free air temperature TA CT RT 0.0047 1.8 1 0 SYMBOL VCC Vi Vo RATINGS MIN 7 - 0.3 MAX 40 VCC - 2 40 200 0.3 10 500 200 70 UNITS V A V mA F k kHz C
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GM7500 V1.00
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Parameter Measurement Information
VCC = 15V
150 2W TEST INPUTS 12k 0.01F DEAD-TIME FEEDBACK RT CT (+) (-) (+) ERROR REF OUT (-) OUTPUT CONTROL C2 E2 C1 E1
100 2W OUTPUT 1
OUTPUT 2
50k
TEST CIRCUIT
VCC VOLTAGE AT C1 0 VCC VOLTAGE AT C2 0
VOLTAGE AT CT
THRESHOLD VOLTAGE DEAD-TIME CONTROL INPUT THRESHOLD VOLTAGE FEEDBACK
GM7500 V1.00
DUTY CYCLE
0%
MAX VOLTAGE WAVEFORMS
FIGURE 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
4
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
AMPLIFIER UNDER TEST FEEDBACK TERMINAL
Vref
OTHER AMPLIFIER
FIGURE 2. AMPLIFIER CHARACTERISTICS
15V 68 2W OUTPUT CL = 15pF (Includes probe and jig capacitance)
tf
90%
tr
90%
(EACH OUTPUT CIRCUIT)
10%
10% OUTPUT VOLTAGE WAVEFORM
FIGURE 3. COMMON-EMITTER CONFIGURATION
15V
(EACH OUTPUT CIRCUIT)
90%
90%
OUTPUT CL = 15pF (Includes probe and jig capacitance) 68 2W
10%
10%
tr
tf
FIGURE 42. EMITTER-FOLLOWER CONFIGURATION
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GM7500 V1.00
OUTPUT VOLTAGE WAVEFORM
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Electrical Characteristics (TA = 0C to 70C, VCC=15V, f = 10kHz, unless otherwise
specified) Reference Section Parameter
Output Voltage Line Regulation Load Regulation Short Circuit output Current
Symbol
Vref Vref-V Vref-I ISC IO = 1mA
Test Conditions
Min
4.9 4.95
Typ
5.0 5.0 2 1
Max
5.1 5.05 25 15 50
Unit
V mV mV mA
TA = 25C, IO = 1mA 7V < VCC < 40V 1mA < IO < 10mA Vref =0
10
35
Oscillator Section (See Figure 1) Parameter
Frequency Frequency Change with Temperature *****
Test Conditions *
CT = 0.01F, RT = 12 k, TA = 25C CT = 0.01F, RT = 12 k CT = 0.01F, RT = 12 k, T = Min to Max
Min
9.2 9.0
Typ
10 2
Max
10.8 12
Unit
KHz KHz
Amplifier Section (See Figure 2) Parameter
Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Range Open-loop Voltage Amplification Unity-gain Bandwidth
Symbol
VOFFSET IOFFSET IBIAS CMRR
Test Conditions *
VO (pin 3) = 2.5V VO (pin 3) = 2.5V VO (pin 3) = 2.5V VCC = 7V to 40V VO = 3V, RL = 2k, VO = 0.5 to 3.5V
Min
Typ
2 25 0.2
Max
10 250 1
Unit
mV nA A V
-0.3 to VCC - 2 70 95 650
dB KHz
Output Section Parameter
Collector off-state Current Emitter off-state Current Collectoremitter Saturation Voltage Common-Emitter Emitter -Follow
Test Conditions *
VCE = 40V, VCC = 40V VCC = VC = 40V, VE = 0V VE = 0, IC = 200mA VC = 15V, IE = -200mA VI = Vref
Min
Typ
2
Max
100 -100
Unit
A A V mA
1.1 1.5
1.3 2.5 3.5
GM7500 V1.00
Output Control Input Current
Dead-time Control Section (See Figure 1) Parameter
Input Bias Current (pin 4) Maximum Duty Cycle, each output Input Threshold Voltage (pin 4)
Test Conditions *
VI = 0 to 5.25v VI (pin 4) = 0, O.C. = Vref Zero duty cycle Maximum duty cycle
Min
Typ
-2
Max
-10
Unit
A %
45 3 0 3.3
V
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GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Electrical Characteristics (TA = 0C to 70C, VCC=15V, f = 10kHz, unless otherwise
specified) Parameter PWM Comparator Section (See Figure 1)
Input Threshold Voltage (pin 3) Input Sink Current (pin 3) Zero Duty Cycle V(pin 3) = 0.7V 0.3 4 0.7 4.5 V mA
Condition
Min
Typ
Max
Unit
Switching Characteristics, TA = 25C Section (See Figure 1)
Output Voltage Rise Time Output Voltage Fall Time Output Voltage Rise Time Output Voltage Fall Time Common-Emitter Configuration, See Figure 3 Emitter-Follower Configuration, See Figure 4 100 25 100 25 200 100 200 100 ns
* For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ** All typical values except for parameter changes with temperature are at TA = 25 C *** Duration of the short-circuit should not exceed one second **** This is guaranteed where the marking code on the package surface is "A" ***** Temperature coefficient of timing capacitor and timing resistor not taken into account
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GM7500 V1.00
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Package Outline Dimensions - SO 16
0.386 - 0.402 (9.800 - 10.200)
0.150 - 0.157 (3.800 - 4.000) 0.016 - 0.050 (0.400 - 1.270)
0.228 - 0.244 (5.800 - 6.200)
0.050 (BSC) 1.270 (BSC)
0.053 - 0.061 (1.350 - 1.550) 0-8
O O
SEATING PLAN
0.013 - 0.020 (0.330 - 0.510)
0.004 - 0.010 0.007 - 0.010 (0.100 - 0.250) (0.170 - 0.250)
inches (mm)
Package Outline Dimensions - DIP 16
16
9
0.244 - 0.260 (0.204 - 0.360)
1
8
0.740 - 0.758 (18.800 - 19.200)
0.060 (BSC) 1.524 (BSC) 0.146 - 0.170 (3.710 - 4.310)
0.244 - 0.260 (6.200 - 6.600)
0.118 - 0.142 (3.000 - 3.600) 0.015 - 0.022 (0.380 - 0.570) 0.331 - 0.354 (8.400 - 9.000)
0.008 - 0.014 (0.204 - 0.360)
0.100 (BSC) 2.540 (BSC)
GM7500 V1.00
inches (mm)
8
GM7500
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Ordering Number
GM 7500
APM Gamma Micro Circuit Type
S16
Package Type S16: SO 16 D16: DIP 16
R
Shipping Type R: Taping & Reel T: Tube
91
GM7500 V1.00

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